Outlet1Phase

p

C++ Type:double

Unit:(no unit assumed)

Controllable:Yes

Description:Prescribed pressure [Pa]

(modules/thermal_hydraulics/test/tests/base/simulation/err.no_smp.i)

[GlobalParams]
  gravity_vector = '0 0 9.81'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0

  fp = water

  closures = simple_closures
  f = 0
[]

[FluidProperties]
  [water]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 1
    T = 300
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = '1'
    A = 1
    D_h = 1
    n_elems = 2
  []

  [jct1]
    type = VolumeJunction1Phase
    position = '1 0 0'
    volume = 1e-3
    connections = 'pipe1:out pipe2:in'
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '1 0 0'
    length = '1'
    A = 1
    D_h = 1
    n_elems = 2
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 101325
  []
[]

[Executioner]
  type = Transient

  dt = 0.01
  num_steps = 2
[]

(modules/thermal_hydraulics/test/tests/misc/initial_from_file/heat_transfer_from_heat_structure_3d/test.i)

[GlobalParams]
  scaling_factor_1phase = '1. 1.e-2 1.e-4'
  scaling_factor_temperature = 1e-2

  initial_from_file = 'steady_state_out.e'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Materials]
  [mat]
    type = ADGenericConstantMaterial
    prop_names = 'density specific_heat thermal_conductivity'
    prop_values = '16 356 6.5514e3'
  []
[]

[Functions]
  [Ts_bc]
    type = ParsedFunction
    expression = '2*sin(x*pi/2)+2*sin(pi*y) +507'
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '-1 0 -2.5'
    orientation = '1 0 0'
    length = 2
    n_elems = 2
    A = 0.3
    D_h = 0.1935483871
    f = 0.1
  []
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.1
    T = 500
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 6e6
  []
  [ht]
    type = HeatTransferFromHeatStructure3D1Phase
    flow_channels = 'pipe'
    hs = blk
    boundary = blk:right
    P_hf = 3
    Hw = 1000
  []
  [blk]
    type = HeatStructureFromFile3D
    file = box.e
    position = '0 0 0'
  []
  [right_bnd]
    type = HSBoundarySpecifiedTemperature
    hs = blk
    boundary = blk:bottom
    T = Ts_bc
  []
[]

[Executioner]
  type = Transient
  dt = 1
  num_steps = 1
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100
[]

[Outputs]
  exodus = true
  execute_on = 'initial'
[]

(modules/thermal_hydraulics/test/tests/components/inlet_stagnation_enthalpy_1phase/phy.h_rhou_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 101325
  initial_T = 300
  initial_vel = 0

  scaling_factor_1phase = '1.e2 1. 1.e-3'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = IdealGasFluidProperties
    gamma = 1.41
    molar_mass = 28.9662e-3
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = eos
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A = 1e-4
    D_h  = 1.1283791671e-02

    f = 0.0

    length = 1
    n_elems = 100
  []

  [inlet]
    type = InletStagnationEnthalpyMomentum1Phase
    input = 'pipe:in'
    H    = 296748.357480000
    rhou = 41.0009888754850
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 101325
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'
  dt = 1.e-2
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  nl_rel_tol = 1e-14
  nl_abs_tol = 5e-8
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100

  start_time = 0.0
  end_time = 0.2
[]

(modules/thermal_hydraulics/test/tests/controls/set_bool_value_control/test.i)

# This is testing that the values set by SetBoolValueControl are used.
# The values of function T0_fn are compared to a threshold and the boolean
# result is stored into an aux field via `BooleanValueTestAux`.

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 15.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 100.e3
    T0 = 350.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[AuxVariables]
  [aux]
  []
[]

[AuxKernels]
  [aux_kernel]
    type = BooleanValueTestAux
    variable = aux
    value = 1
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Functions]
  [T0_fn]
    type = PiecewiseLinear
    x = '0 1'
    y = '350 345'
  []
[]

[ControlLogic]
  [T_inlet_fn]
    type = GetFunctionValueControl
    function = T0_fn
  []

  [threshold_ctrl]
    type = UnitTripControl
    condition = 'T > 347.5'
    symbol_names = 'T'
    symbol_values = 'T_inlet_fn:value'
  []

  [set_bool_value]
    type = SetBoolValueControl
    parameter = AuxKernels/aux_kernel/value
    value = 'threshold_ctrl:state'
  []
[]

[Postprocessors]
  [aux]
    type = ElementAverageValue
    variable = aux
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 0.1
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0.0
  end_time = 1

  automatic_scaling = true
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/misc/restart_1phase/test.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[SolidProperties]
  [mat1]
    type = ThermalFunctionSolidProperties
    k = 16
    cp = 356.
    rho = 6.551400E+03
  []
[]

[Functions]
  [Ts_init]
    type = ParsedFunction
    expression = '2*sin(x*pi)+507'
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = eos
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 5
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [jct1]
    type = VolumeJunction1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1 0 0'
    volume = 1e-5
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    fp = eos
    # geometry
    position = '1 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 5
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [jct2]
    type = VolumeJunction1Phase
    connections = 'pipe2:out pipe3:in'
    position = '2 0 0'
    volume = 1e-5
    use_scalar_variables = false
  []

  [pipe3]
    type = FlowChannel1Phase
    fp = eos
    # geometry
    position = '2 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 5
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [hs]
    type = HeatStructureCylindrical
    position = '1 0.01 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 5
    names = '0'
    n_part_elems = 1
    solid_properties = 'mat1'
    solid_properties_T_ref = '300'
    widths = 0.1
  []

  [temp_outside]
    type = HSBoundarySpecifiedTemperature
    hs = hs
    boundary = hs:outer
    T = Ts_init
  []

  [inlet]
    type = InletVelocityTemperature1Phase
    input = 'pipe1:in'
    T = 507
    vel = 1
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe3:out'
    p = 6e6
  []

  [hx3ext]
    type = HeatTransferFromExternalAppTemperature1Phase
    flow_channel = pipe3
    P_hf = 0.0449254
    Hw = 100000
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 0.01
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'newton'
  line_search = 'basic'
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  automatic_scaling = true

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
[]

[Outputs]
  exodus = true
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_specified_temperature_1phase/clg.Hw.i)

[GlobalParams]
  initial_p = 0.1e6
  initial_vel = 0
  initial_T = 300
  scaling_factor_1phase = '1e+0 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1.0
    n_elems = 10

    A = 3.14e-2
    f = 0.1
  []

  [ht_pipe1]
    type = HeatTransferFromSpecifiedTemperature1Phase
    flow_channel = pipe1
    T_wall = 310
    Hw = 0
  []

  [inlet1]
    type = InletDensityVelocity1Phase
    input = 'pipe1:in'
    rho = 996.557482499661660
    vel = 1
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 0.1e6
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 0.05
  num_steps = 20
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 30
[]

[Outputs]
  csv = true
[]

[Functions]
  [Hw_fn]
    type = PiecewiseLinear
    x = '0     1'
    y = '10  110'
  []
[]

[ControlLogic]
  [pipe_Hw_ctrl]
    type = TimeFunctionComponentControl
    component = ht_pipe1
    parameter = Hw
    function = Hw_fn
  []
[]

[Postprocessors]
  [Hw]
    type = RealComponentParameterValuePostprocessor
    component = ht_pipe1
    parameter = Hw
  []
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_heat_structure_3d/jac.1phase.i)

[Materials]
  [mat]
    type = ADGenericConstantMaterial
    block = 'blk:0'
    prop_names = 'density specific_heat thermal_conductivity'
    prop_values = '1000 100 30'
  []
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [T_init]
    type = ParsedFunction
    expression = '1000*y+300+30*z'
  []
[]
[GlobalParams]
  scaling_factor_1phase = '1 1 1e-3'
  gravity_vector = '0 0 0'
[]
[Components]
  [fch]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    fp = fp
    n_elems = 6
    length = 1
    initial_T = T_init
    initial_p = 1.01e5
    initial_vel = 0
    closures = simple_closures
    A   = 0.00314159
    D_h  = 0.2
    f = 0.01
  []
  [in]
    type = InletVelocityTemperature1Phase
    input = 'fch:in'
    vel = 1
    T = 300
  []
  [out]
    type = Outlet1Phase
    input = 'fch:out'
    p = 1.01e5
  []
  [blk]
    type = HeatStructureFromFile3D
    file = mesh.e
    position = '0 0 0'
    initial_T = T_init
  []
  [ht]
    type = HeatTransferFromHeatStructure3D1Phase
    flow_channels = 'fch'
    hs = blk
    boundary = blk:rmin
    Hw = 10000
    P_hf = 0.1564344650402309
  []
[]

[Postprocessors]
  [energy_hs]
    type = ADHeatStructureEnergy3D
    block = blk:0
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [energy_fch]
    type = ElementIntegralVariablePostprocessor
    block = fch
    variable = rhoEA
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [total_energy]
    type = SumPostprocessor
    values = 'energy_fch energy_hs'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [energy_change]
    type = ChangeOverTimePostprocessor
    change_with_respect_to_initial = true
    postprocessor = total_energy
    compute_relative_change = true
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]
[Preconditioning]
  [pc]
    type = SMP
    full = true
    petsc_options_iname = '-snes_test_err'
    petsc_options_value = ' 1e-9'
  []
[]
[Executioner]
  type = Transient
  scheme = bdf2
  dt = 0.1
  num_steps = 1

  solve_type = PJFNK
  line_search = basic
  abort_on_solve_fail = true
  nl_abs_tol = 1e-8
[]

[Outputs]
  file_base = 'phy.conservation'
  csv = true
  show = 'energy_change'
  execute_on = 'final'
[]

(modules/thermal_hydraulics/test/tests/components/outlet_1phase/phy.solidwall_outlet_3eqn.i)

# This test problem simulates a tube filled with steam that is suddenly opened
# on one end to an environment with a lower pressure.

[GlobalParams]
  gravity_vector = '0 0 0'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.43
    cv = 1040.0
    q = 2.03e6
    p_inf = 0.0
    q_prime = -2.3e4
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp

    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1.0
    n_elems = 100
    A = 1.0

    # IC
    initial_T = 400
    initial_p = 1e5
    initial_vel = 0

    f = 0
  []

  [left_wall]
    type = SolidWall1Phase
    input = 'pipe:in'
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 0.95e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-5
  nl_max_its = 15

  l_tol = 1e-3
  l_max_its = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0.0
  end_time = 0.2

  dt = 0.01
  abort_on_solve_fail = true

  automatic_scaling = true
[]

[Outputs]
  file_base = 'phy.solidwall_outlet_3eqn'
  velocity_as_vector = false
  [exodus]
    type = Exodus
    show = 'p T vel'
  []

[]

(modules/thermal_hydraulics/test/tests/components/junction_parallel_channels_1phase/phy.unequal_area.i)

# Junction between 2 pipes where the second has half the area of the first.
# The momentum density of the second should be twice that of the first.

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 300
  initial_p = 1e5
  initial_vel_x = 50
  initial_vel_y = 0
  initial_vel_z = 0

  f = 0

  fp = eos

  scaling_factor_1phase = '1 1e-2 1e-5'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    p_inf = 0
    q = 0
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 10
    T = 250
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    A = 1
    n_elems = 20
    initial_vel = 20
  []

  [junction]
    type = JunctionParallelChannels1Phase
    connections = 'pipe1:out pipe2:in'
    scaling_factor_rhouV = 1e-4
    scaling_factor_rhoEV = 1e-5
    position = '1 0 0'
    volume = 1e-8
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '1 0 0'
    length = 1
    A = 0.5
    n_elems = 20
    initial_vel = 15
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 15

  l_tol = 1e-10
  l_max_its = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0
  end_time = 3
  dt = 0.1

  abort_on_solve_fail = true
[]

[Postprocessors]
  # These post-processors are used to test that the outlet side of the junction,
  # which has half the area of the inlet side, has twice the momentum density
  # that the inlet side does.
  [rhouA_pipe1]
    type = SideAverageValue
    variable = rhouA
    boundary = pipe1:out
  []
  [rhouA_pipe2]
    type = SideAverageValue
    variable = rhouA
    boundary = pipe2:out
  []
  [test_rel_err]
    type = RelativeDifferencePostprocessor
    value1 = rhouA_pipe1
    value2 = rhouA_pipe2
  []
[]

[Outputs]
  [out]
    type = CSV
    show = test_rel_err
    execute_on = 'final'
  []
[]
[Debug]
  show_var_residual_norms = true
[]

(modules/thermal_hydraulics/test/tests/components/pump_1phase/clg.head.i)

[GlobalParams]
  initial_T = 393.15
  initial_vel = 0.0372
  f = 0
  fp = fp

  scaling_factor_1phase = '1e-2 1e-2 1e-5'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [pump_head_fn]
    type = PiecewiseLinear
    x = '0  0.5'
    y = '0  1  '
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 20
    T = 393.15
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 0.567

    initial_p = 1.318964e+07
  []

  [pump]
    type = Pump1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1.02 0 0'
    head = 0
    volume = 0.567
    A_ref = 0.567

    initial_p = 1.318964e+07
    initial_vel_x = 0.0372
    initial_vel_y = 0
    initial_vel_z = 0
    scaling_factor_rhoV  = 1
    scaling_factor_rhouV = 1
    scaling_factor_rhoEV = 1e-5
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1.04 0 0'
    orientation = '1 0 0'
    length = 0.96
    n_elems = 10
    A = 0.567

    initial_p = 1.4072e+07
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1.4072e+07
  []
[]

[ControlLogic]
  [pump_head_ctrl]
    type = TimeFunctionComponentControl
    component = pump
    parameter = head
    function = pump_head_fn
  []
[]

[Postprocessors]
  [pump_head]
    type = RealComponentParameterValuePostprocessor
    component = pump
    parameter = head
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 0.1
  num_steps = 10
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-6
  nl_max_its = 15
  l_tol = 1e-4
  l_max_its = 10

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  [out]
    type = CSV
    show = 'pump_head'
  []
  print_linear_residuals = false
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_heat_structure_1phase/fin_enhancement.i)

# This test has 2 pipes, each surrounded by a cylindrical HS:
#
#   - pipe1: no fin heat transfer enhancement
#   - pipe2: fin heat transfer enhancement

diam = 0.01
area = ${fparse 0.25 * pi * diam^2}

length = 1.0
n_elems = 10

t_hs = 0.02
n_elems_radial = 5

rho_inlet = 1359.792245 # @ T = 300 K, p = 1e5 Pa
vel_inlet = 1.0
T_inlet = 300
p_outlet = 1e5
T_initial_hs = 800
mfr_inlet = ${fparse rho_inlet * vel_inlet * area}

htc = 100

# Suppose that there are 20 rectangular, 1-mm-thick fins of height 1 mm over the length
# of the cooled section.
n_fin = 20
h_fin = 0.001
t_fin = 0.001
A_fin_single = ${fparse (2 * h_fin + t_fin ) * length}
A_fin = ${fparse n_fin * A_fin_single}
A_cooled = ${fparse pi * diam * length}
A_total = ${fparse A_fin + A_cooled - n_fin * t_fin * length}
fin_area_fraction = ${fparse A_fin / A_total}
area_increase_factor = ${fparse A_total / A_cooled}
fin_perimeter_area_ratio = ${fparse (2 * length + 2 * t_fin) / (length * t_fin)}

k_fin = 15.0

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[SolidProperties]
  [sp_ss316]
    type = ThermalSS316Properties
  []
[]

[FunctorMaterials]
  [fin_efficiency_fmat]
    type = FinEfficiencyFunctorMaterial
    fin_height = ${h_fin}
    fin_perimeter_area_ratio = ${fparse fin_perimeter_area_ratio}
    heat_transfer_coefficient = ${htc}
    thermal_conductivity = ${k_fin}
    fin_efficiency_name = fin_efficiency
  []
  [fin_enhancement_fmat]
    type = FinEnhancementFactorFunctorMaterial
    fin_efficiency = fin_efficiency
    fin_area_fraction = ${fin_area_fraction}
    area_increase_factor = ${area_increase_factor}
    fin_enhancement_factor_name = fin_enhancement
  []
[]

[Components]
  # pipe1

  [pipe1_inlet]
    type = InletMassFlowRateTemperature1Phase
    m_dot = ${mfr_inlet}
    T = ${T_inlet}
    input = 'pipe1:in'
  []
  [pipe1]
    type = FlowChannel1Phase
    gravity_vector = '0 0 0'
    position = '0 0 0'
    orientation = '0 0 1'
    length = ${length}
    n_elems = ${n_elems}
    A = ${area}
    initial_T = ${T_inlet}
    initial_p = ${p_outlet}
    initial_vel = ${vel_inlet}
    fp = fp
    closures = simple_closures
    f = 0
    scaling_factor_1phase = '1 1 1e-5'
  []
  [pipe1_outlet]
    type = Outlet1Phase
    p = ${p_outlet}
    input = 'pipe1:out'
  []
  [ht1]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = pipe1
    hs = hs1
    hs_side = inner
    Hw = ${htc}
  []
  [hs1]
    type = HeatStructureCylindrical
    position = '0 0 0'
    orientation = '0 0 1'
    length = ${length}
    n_elems = ${n_elems}
    inner_radius = ${fparse 0.5 * diam}
    names = 'main'
    solid_properties = 'sp_ss316'
    solid_properties_T_ref = '300'
    widths = '${t_hs}'
    n_part_elems = '${n_elems_radial}'
    initial_T = ${T_initial_hs}
    scaling_factor_temperature = 1e-5
  []

  # pipe 2

  [pipe2_inlet]
    type = InletMassFlowRateTemperature1Phase
    m_dot = ${mfr_inlet}
    T = ${T_inlet}
    input = 'pipe2:in'
  []
  [pipe2]
    type = FlowChannel1Phase
    gravity_vector = '0 0 0'
    position = '0 0.5 0'
    orientation = '0 0 1'
    length = ${length}
    n_elems = ${n_elems}
    A = ${area}
    initial_T = ${T_inlet}
    initial_p = ${p_outlet}
    initial_vel = ${vel_inlet}
    fp = fp
    closures = simple_closures
    f = 0
    scaling_factor_1phase = '1 1 1e-5'
  []
  [pipe2_outlet]
    type = Outlet1Phase
    p = ${p_outlet}
    input = 'pipe2:out'
  []
  [ht2]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = pipe2
    hs = hs2
    hs_side = inner
    Hw = ${htc}
    scale = fin_enhancement
  []
  [hs2]
    type = HeatStructureCylindrical
    position = '0 0.5 0'
    orientation = '0 0 1'
    length = ${length}
    n_elems = ${n_elems}
    inner_radius = ${fparse 0.5 * diam}
    names = 'main'
    solid_properties = 'sp_ss316'
    solid_properties_T_ref = '300'
    widths = '${t_hs}'
    n_part_elems = '${n_elems_radial}'
    initial_T = ${T_initial_hs}
    scaling_factor_temperature = 1e-5
  []
[]

[Postprocessors]
  [pipe1_T_avg]
    type = ElementAverageValue
    variable = T
    block = 'pipe1'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [pipe2_T_avg]
    type = ElementAverageValue
    variable = T
    block = 'pipe2'
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [hs1_T_avg]
    type = SideAverageValue
    variable = T_solid
    boundary = 'hs1:inner'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [hs2_T_avg]
    type = SideAverageValue
    variable = T_solid
    boundary = 'hs2:inner'
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  end_time = 10.0
  dt = 1.0

  solve_type = NEWTON
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 15

  l_tol = 1e-3
  l_max_its = 10
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/supersonic_inlet/err.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  closures = simple_closures
  fp = fp

  f = 0.0

  initial_T = 300
  initial_p = 1e5
  initial_vel = 0
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
    molar_mass = 0.02897
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [in]
    type = SupersonicInlet
    input = 'pipe:in'
    vel = 500
    T = 300
    p = 1e5
  []

  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 2
    A = 0.1
  []

  [out]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2

  solve_type = NEWTON
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 20

  l_tol = 1e-4

  start_time = 0.0
  end_time = 1.0
  dt = 0.01
  abort_on_solve_fail = true
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_specified_temperature_1phase/clg.T_wall.i)

[GlobalParams]
  initial_p = 0.1e6
  initial_vel = 0
  initial_T = 300
  scaling_factor_1phase = '1e+0 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = eos
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1.0
    n_elems = 50

    A = 3.14e-2
    f = 0.1
  []

  [ht_pipe1]
    type = HeatTransferFromSpecifiedTemperature1Phase
    flow_channel = pipe1
    T_wall = 300
    Hw = 0
  []

  [inlet1]
    type = InletDensityVelocity1Phase
    input = 'pipe1:in'
    rho = 996.557482499661660
    vel = 1
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 0.1e6
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 0.05
  num_steps = 20
  abort_on_solve_fail = true

  solve_type = 'newton'
  line_search = 'basic'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 30
[]

[Outputs]
  csv = true
[]

[Functions]
  [T_wall_fn]
    type = PiecewiseLinear
    x = '0 1'
    y = '310 320'
  []
[]

[ControlLogic]
  [pipe_T_wall_ctrl]
    type = TimeFunctionComponentControl
    component = ht_pipe1
    parameter = T_wall
    function = T_wall_fn
  []
[]

[Postprocessors]
  [T_wall]
    type = RealComponentParameterValuePostprocessor
    component = ht_pipe1
    parameter = T_wall
  []
[]

(modules/thermal_hydraulics/test/tests/misc/surrogate_power_profile/surrogate_power_profile.i)

# This takes an exodus file with a power profile and uses that in a heat structure
# of a core channel as power density.  This tests the capability of taking a
# rattlesnake generated power profile and using it in RELAP-7.

[GlobalParams]
  initial_p = 15.5e6
  initial_vel = 0.
  initial_T = 559.15

  gravity_vector = '0 -9.8 0'

  scaling_factor_1phase = '1 1 1e-4'
  scaling_factor_temperature = 1e-2

  closures = simple_closures
[]

[FluidProperties]
  [water]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[SolidProperties]
  [fuel-mat]
    type = ThermalFunctionSolidProperties
    k = 2.5
    cp = 300.
    rho = 1.032e4
  []
  [gap-mat]
    type = ThermalFunctionSolidProperties
    k = 0.6
    cp = 1.
    rho = 1.
  []
  [clad-mat]
    type = ThermalFunctionSolidProperties
    k = 21.5
    cp = 350.
    rho = 6.55e3
  []
[]

[Components]
  [CCH1:pipe]
    type = FlowChannel1Phase
    position = '0.02 0 0'
    orientation = '0 1 0'
    length = 3.865
    n_elems = 20

    A = 8.78882e-5
    D_h = 0.01179
    f = 0.01
    fp = water
  []

  [CCH1:solid]
    type = HeatStructureCylindrical
    position = '0.024748 0 0'
    orientation = '0 1 0'
    length = 3.865
    n_elems = 20

    initial_T = 559.15
    names = 'fuel gap clad'
    widths = '0.004096 0.0001 0.000552'
    n_part_elems = '5 1 2'
    solid_properties = 'fuel-mat gap-mat clad-mat'
    solid_properties_T_ref = '300 300 300'
  []

  [CCH1:hx]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = CCH1:pipe
    hs = CCH1:solid
    hs_side = outer
    Hw = 5.33e4
    P_hf = 2.9832563838489e-2
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'CCH1:pipe:in'
    m_dot = 0.1
    T = 559.15
  []
  [outlet]
    type = Outlet1Phase
    input = 'CCH1:pipe:out'
    p = 15.5e6
  []
[]

[UserObjects]
  [reactor_power_density_uo]
    type = SolutionUserObject
    mesh = 'power_profile.e'
    system_variables = power_density
    translation = '0. 0. 0.'
  []
[]

[Functions]
  [power_density_fn]
    type = SolutionFunction
    from_variable = power_density
    solution = reactor_power_density_uo
  []
[]

[AuxVariables]
  [power_density]
    family = MONOMIAL
    order = CONSTANT
    block = 'CCH1:solid:fuel'
  []
[]

[AuxKernels]
  [power_density_aux]
    type = FunctionAux
    variable = power_density
    function = power_density_fn
    block = 'CCH1:solid:fuel'
    execute_on = 'timestep_begin'
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0.0
  num_steps = 10
  dt = 1e-2
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-9
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  [out]
    type = Exodus
  []
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/tutorials/single_phase_flow/01_flow_channel.i)

T_in = 300. # K
m_dot_in = 1e-2 # kg/s
press = 10e5 # Pa

[GlobalParams]
  initial_p = ${press}
  initial_vel = 0.0001
  initial_T = ${T_in}
  gravity_vector = '0 0 0'

  rdg_slope_reconstruction = minmod
  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = thm_closures
  fp = he
[]

[FluidProperties]
  [he]
    type = IdealGasFluidProperties
    molar_mass = 4e-3
    gamma = 1.67
    k = 0.2556
    mu = 3.22639e-5
  []
[]

[Closures]
  [thm_closures]
    type = Closures1PhaseTHM
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'core_chan:in'
    m_dot = ${m_dot_in}
    T = ${T_in}
  []

  [core_chan]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    length = 1
    n_elems = 25
    A = 7.2548e-3
    D_h = 7.0636e-2
  []

  [outlet]
    type = Outlet1Phase
    input = 'core_chan:out'
    p = ${press}
  []
[]

[Postprocessors]
  [core_p_in]
    type = SideAverageValue
    boundary = core_chan:in
    variable = p
  []

  [core_p_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = p
  []

  [core_delta_p]
    type = ParsedPostprocessor
    pp_names = 'core_p_in core_p_out'
    expression = 'core_p_in - core_p_out'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  solve_type = NEWTON
  line_search = basic

  start_time = 0
  end_time = 1000
  dt = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 25

[]

[Outputs]
  exodus = true

  [console]
    type = Console
    max_rows = 1
    outlier_variable_norms = false
  []
  print_linear_residuals = false
[]

(modules/thermal_hydraulics/test/tests/actions/coupled_heat_transfer_action/sub_2phase.i)

# This is the 2-phase version of sub.i: it just adds the variable 'kappa'.
# Unfortunately, multi-parameter application of cli_args is not supported for
# sub-app input files, so sub.i cannot be re-used for the test.

[GlobalParams]
  initial_p = 1.e5
  initial_vel = 0.
  initial_T = 300.

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[AuxVariables]
  [Hw]
    family = monomial
    order = constant
    block = pipe1
  []
  [kappa]
    family = monomial
    order = constant
    block = pipe1
  []
[]

[AuxKernels]
  [Hw_ak]
    type = ADMaterialRealAux
    variable = Hw
    property = 'Hw'
  []
  [kappa_ak]
    type = ConstantAux
    variable = kappa
    value = 0.5
  []
[]

[UserObjects]
  [T_uo]
    type = LayeredAverage
    direction = y
    variable = T
    num_layers = 10
    block = pipe1
  []
  [Hw_uo]
    type = LayeredAverage
    direction = y
    variable = Hw
    num_layers = 10
    block = pipe1
  []
  [kappa_uo]
    type = LayeredAverage
    direction = y
    variable = kappa
    num_layers = 10
    block = pipe1
  []
[]


[Components]
  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 1 0'
    length = 1
    n_elems = 10

    A   = 1.28584e-01
    D_h = 8.18592e-01
    f = 0.01

    fp = eos
  []

  [hxconn]
    type = HeatTransferFromExternalAppTemperature1Phase
    flow_channel = pipe1
    Hw = 10000
    P_hf = 6.28319e-01
    initial_T_wall = 300.
    var_type = elemental
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 10
    T = 400
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Postprocessors]
  [T_wall_avg]
    type = ElementAverageValue
    variable = T_wall
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [htc_avg]
    type = ElementAverageValue
    variable = Hw
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [T_avg]
    type = ElementAverageValue
    variable = T
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'
  dt = 0.1
  dtmin = 1e-7
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-4
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 300

  start_time = 0.0

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
[]

[Outputs]
  [out]
    type = Exodus
    show = 'T_wall T Hw'
  []
[]

(modules/thermal_hydraulics/test/tests/components/form_loss_from_external_app_1phase/phy.form_loss_1phase.child.i)

[GlobalParams]
  initial_p = 1e5
  initial_vel = 0.5
  initial_T = 300.0

  gravity_vector = '0 0 0'

  scaling_factor_1phase = '1 1e-2 1e-4'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 2
    A = 1
    n_elems = 10

    f = 0
  []
  [form_loss]
    type = FormLossFromExternalApp1Phase
    flow_channel = pipe
  []
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 680
    T = 300
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2
  dt = 0.1
  abort_on_solve_fail = true
  timestep_tolerance = 5e-14

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-8
  nl_abs_tol = 5e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 20

  start_time = 0.0
  end_time = 4.0

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  exodus = true
  show = 'K_prime p'
[]

(modules/thermal_hydraulics/test/tests/components/volume_junction_1phase/equal_area_no_junction.i)

# Tests a junction between 2 flow channels of equal area and orientation. A
# sinusoidal density shape is advected to the right and should not be affected
# by the junction; the solution should be identical to the equivalent
# no-junction solution.
#
# This input file has no junction and is used for comparison to the results with
# a junction.

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_vel = 1

  A = 25

  f = 0

  fp = fp

  scaling_factor_1phase = '0.04 0.04 0.04e-5'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    p_inf = 0
    q = 0
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [T0]
    type = CosineHumpFunction
    axis = x
    hump_center_position = 1
    hump_width = 0.5
    hump_begin_value = 250
    hump_center_value = 300
  []
[]

[Components]
  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    # Stagnation property with p = 1e5 Pa, T = 250 K, vel = 1 m/s
    p0 = 100000.68965687
    T0 = 250.00049261084
  []

  [pipe1]
    type = FlowChannel1Phase

    position = '0 0 0'
    orientation = '1 0 0'
    length = 2

    initial_T = T0

    n_elems = 50
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  scheme = 'bdf2'
  start_time = 0
  dt = 0.01
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 10

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Postprocessors]
  [junction_rhoA]
    type = PointValue
    variable = rhoA
    point = '1.02 0 0'
    execute_on = 'initial timestep_end'
  []
  [junction_rhouA]
    type = PointValue
    variable = rhouA
    point = '1.02 0 0'
    execute_on = 'initial timestep_end'
  []
  [junction_rhoEA]
    type = PointValue
    variable = rhoEA
    point = '1.02 0 0'
    execute_on = 'initial timestep_end'
  []
  [junction_rho]
    type = ScalePostprocessor
    value = junction_rhoA
    scaling_factor = 0.04
    execute_on = 'initial timestep_end'
  []
  [junction_rhou]
    type = ScalePostprocessor
    value = junction_rhouA
    scaling_factor = 0.04
    execute_on = 'initial timestep_end'
  []
  [junction_rhoE]
    type = ScalePostprocessor
    value = junction_rhoEA
    scaling_factor = 0.04
    execute_on = 'initial timestep_end'
  []
[]

[Outputs]
  [out]
    type = CSV
    show = 'junction_rho junction_rhou junction_rhoE'
    execute_scalars_on = 'none'
    execute_on = 'initial timestep_end'
  []
[]

(modules/thermal_hydraulics/test/tests/problems/pressure_drop/pressure_drop.i)

nelem = 100
friction_factor = 1e4

area = 0.176752
mfr_final = 1.0
p_out = 7e6
T_in = 300
ramp_time = 5.0

[GlobalParams]
  gravity_vector = '0 0 0'
  initial_T = ${T_in}
  initial_p = ${p_out}
  initial_vel = 0
  closures = closures
  rdg_slope_reconstruction = full
  scaling_factor_1phase = '1 1 1e-5'
[]

[FluidProperties]
  [h2]
    type = IdealGasFluidProperties
    gamma = 1.3066
    molar_mass = 2.016e-3
    k = 0.437
    mu = 3e-5
  []
[]

[Closures]
  [closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [bc_inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'ch_1:in'
    m_dot = 0 # This value is controlled by 'mfr_ctrl'
    T = ${T_in}
  []
  [ch_1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1.0
    n_elems = ${nelem}
    A = ${area}
    f = ${friction_factor}
    fp = h2
  []
  [bc_outlet]
    type = Outlet1Phase
    input = 'ch_1:out'
    p = ${p_out}
  []
[]

[Functions]
  [mfr_fn]
    type = PiecewiseLinear
    x = '0 ${ramp_time}'
    y = '0 ${mfr_final}'
  []
[]

[ControlLogic]
  [mfr_ctrl]
    type = TimeFunctionComponentControl
    component = bc_inlet
    parameter = m_dot
    function = mfr_fn
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[VectorPostprocessors]
  [pressure_vpp]
    type = ADSampler1DReal
    block = 'ch_1'
    property = 'p'
    sort_by = x
    execute_on = 'FINAL'
  []
[]

[Executioner]
  type = Transient

  scheme = bdf2
  start_time = 0
  end_time = 50
  dt = 1

  steady_state_detection = true
  steady_state_start_time = ${ramp_time}

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu     '
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 15
  l_tol = 1e-4
  l_max_its = 10
[]

[Outputs]
  [csv]
    type = CSV
    create_final_symlink = true
    execute_on = 'FINAL'
  []
[]

(modules/thermal_hydraulics/test/tests/components/outlet_1phase/clg.ctrl_p_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0.0

  scaling_factor_1phase = '1 1 1e-5'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 50

    A   = 1.0000000000e-04
    D_h = 1.1283791671e-02

    f = 0.0

    fp = fp
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 1e5
    T0 = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Functions]
  [outlet_p_fn]
    type = PiecewiseLinear
    x = '0   1'
    y = '1e5 1.001e5'
  []
[]

[ControlLogic]
  [set_outlet_value]
    type = TimeFunctionComponentControl
    component = outlet
    parameter = p
    function = outlet_p_fn
  []
[]

[Postprocessors]
  [outlet_p]
    type = RealComponentParameterValuePostprocessor
    component = outlet
    parameter = p
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0.0
  dt = 0.25
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'

  nl_rel_tol = 1e-5
  nl_abs_tol = 1e-6
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/problems/pressure_drop/pressure_drop_with_junction.i)

nelem = 50
friction_factor = 1e4

area = 0.176752
mfr_final = 1.0
p_out = 7e6
T_in = 300
ramp_time = 5.0

[GlobalParams]
  gravity_vector = '0 0 0'
  initial_T = ${T_in}
  initial_p = ${p_out}
  initial_vel = 0
  closures = closures
  rdg_slope_reconstruction = full
  scaling_factor_1phase = '1 1 1e-5'
[]

[FluidProperties]
  [h2]
    type = IdealGasFluidProperties
    gamma = 1.3066
    molar_mass = 2.016e-3
    k = 0.437
    mu = 3e-5
  []
[]

[Closures]
  [closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [bc_inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'ch_1:in'
    m_dot = 0 # This value is controlled by 'mfr_ctrl'
    T = ${T_in}
  []
  [ch_1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = ${nelem}
    A = ${area}
    f = ${friction_factor}
    fp = h2
  []
  [junction]
    type = JunctionOneToOne1Phase
    connections = 'ch_1:out ch_2:in'
  []
  [ch_2]
    type = FlowChannel1Phase
    position = '0.5 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = ${nelem}
    A = ${area}
    f = ${friction_factor}
    fp = h2
  []
  [bc_outlet]
    type = Outlet1Phase
    input = 'ch_2:out'
    p = ${p_out}
  []
[]

[Functions]
  [mfr_fn]
    type = PiecewiseLinear
    x = '0 ${ramp_time}'
    y = '0 ${mfr_final}'
  []
[]

[ControlLogic]
  [mfr_cntrl]
    type = TimeFunctionComponentControl
    component = bc_inlet
    parameter = m_dot
    function = mfr_fn
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[VectorPostprocessors]
  [pressure_vpp]
    type = ADSampler1DReal
    block = 'ch_1 ch_2'
    property = 'p'
    sort_by = x
    execute_on = 'FINAL'
  []
[]

[Executioner]
  type = Transient

  scheme = bdf2
  start_time = 0
  end_time = 50
  dt = 1

  steady_state_detection = true
  steady_state_start_time = ${ramp_time}

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu     '
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 15
  l_tol = 1e-4
  l_max_its = 10
[]

[Outputs]
  [csv]
    type = CSV
    create_final_symlink = true
    execute_on = 'FINAL'
  []
[]

(modules/thermal_hydraulics/test/tests/components/flow_channel_1phase/steady.i)

# Tests that a flow channel can run with Steady executioner.
#
# Note that this solve may fail to converge based on initial guess. For example,
# having a guess with velocity set to zero will fail to converge.

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 2
    T = 500
  []

  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    gravity_vector = '0 0 0'
    length = 1.0
    n_elems = 50
    A = 1.0

    initial_T = 300
    initial_p = 1e5
    initial_vel = 1

    f = 10.0
    closures = simple_closures
    fp = fp

    scaling_factor_1phase = '1 1 1e-5'
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 2e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Steady

  solve_type = NEWTON
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-7
  nl_max_its = 15

  l_tol = 1e-3
  l_max_its = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  exodus = true
[]

(modules/thermal_hydraulics/test/tests/components/inlet_density_velocity_1phase/clg.densityvelocity_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 0.1e6
  initial_vel = 0
  initial_T = 300

  scaling_factor_1phase = '1. 1. 1.'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10

    A = 1.907720E-04
    f = 0.0

    fp = eos
  []

  [inlet]
    type = InletDensityVelocity1Phase
    input = 'pipe:in'

    rho = 996.556340388366266
    vel = 2
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 0.1e6
  []
[]

[Functions]
  [inlet_rho_fn]
    type = PiecewiseLinear
    x = '0   1 '
    y = '996 997'
  []

  [inlet_vel_fn]
    type = PiecewiseLinear
    x = '1 2'
    y = '1 2'
  []
[]

[ControlLogic]
  [inlet_rho_ctrl]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = rho
    function = inlet_rho_fn
  []

  [inlet_vel_ctrl]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = vel
    function = inlet_vel_fn
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 0.1
  num_steps = 20
  abort_on_solve_fail = true

  solve_type = NEWTON
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100
[]

[Postprocessors]
  [rho_inlet]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = rho
  []
  [vel_inlet]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = vel
  []
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/inlet_velocity_t_1phase/phy.velocity_t_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 444.447
  initial_p = 7e6
  initial_vel = 0

  scaling_factor_1phase = '1 1 1e-5'

  closures = simple_closures

[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A   = 1.0000000000e-04
    f = 0.0
    length = 1
    n_elems = 100
  []

  [inlet]
    type = InletVelocityTemperature1Phase
    input = 'pipe:in'
    vel = 1.0
    T     = 444.447
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 7e6
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 0.1
  start_time = 0.0
  end_time = 5.5

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  abort_on_solve_fail = true

[]

[Outputs]
  file_base = 'phy.velocity_t_3eqn'
  [exodus]
    type = Exodus
    show = 'vel T p'
  []
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/components/inlet_velocity_t_1phase/clg.velocity_t_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 444.447
  initial_p = 7e6
  initial_vel = 0

  scaling_factor_1phase = '1 1 1e-5'

  closures = simple_closures

[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A   = 1.0000000000e-04
    f = 0.0
    length = 1
    n_elems = 100
  []

  [inlet]
    type = InletVelocityTemperature1Phase
    input = 'pipe:in'
    vel = 1.0
    T     = 444.447
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 7e6
  []
[]

[Functions]
  [inlet_vel_fn]
    type = PiecewiseLinear
    x = '0 1 2'
    y = '0 0.1 1'
  []

  [inlet_T_fn]
    type = PiecewiseLinear
    x = '0 1 2'
    y = '300 400 440'
  []
[]

[ControlLogic]
  [inlet_vel_ctrl]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = vel
    function = inlet_vel_fn
  []

  [inlet_T_ctrl]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = T
    function = inlet_T_fn
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 0.1
  start_time = 0.0
  num_steps = 20

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  abort_on_solve_fail = true

[]

[Postprocessors]
  [vel_inlet]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = vel
  []
  [T_inlet]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = T
  []
[]

[Outputs]
  [out]
    type = CSV
  []
[]

(modules/thermal_hydraulics/test/tests/misc/initial_from_file/heat_transfer_from_heat_structure/test.i)

# Test that the initial conditions read from the exodus file are correct

[GlobalParams]
  scaling_factor_1phase = '1. 1.e-2 1.e-4'
  scaling_factor_temperature = 1e-2

  closures = simple_closures

  initial_from_file = 'steady_state_out.e'
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[SolidProperties]
  [mat1]
    type = ThermalFunctionSolidProperties
    k = 16
    cp = 356.
    rho = 6.551400E+03
  []
[]

[Functions]
  [Ts_bc]
    type = ParsedFunction
    expression = '2*sin(x*pi)+507'
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 3
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [hs]
    type = HeatStructureCylindrical
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 3
    names = 'wall'
    n_part_elems = 1
    solid_properties = 'mat1'
    solid_properties_T_ref = '300'
    inner_radius = 0.01
    widths = 0.1
  []

  [ht]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = pipe
    hs = hs
    hs_side = INNER
    Hw = 10000
  []

  [temp_outside]
    type = HSBoundarySpecifiedTemperature
    hs = hs
    boundary = hs:outer
    T = Ts_bc
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.1
    T = 500
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 6e6
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 1
  num_steps = 1
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
[]

[Outputs]
  exodus = true
  execute_on = 'initial'
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/components/heat_source_volumetric_1phase/err.base.i)

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [total_power]
    type = TotalPower
    power = 1
  []

  [fch1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    length = 1
    n_elems = 2

    A = 1
    f = 0.1
    fp = fp
    closures = simple_closures

    initial_T = 300
    initial_p = 1e05
    initial_vel = 0
  []

  [hs]
    type = HeatSourceVolumetric1Phase
    flow_channel = fch1
    q = 1
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = fch1:in
    m_dot = 1
    T = 300
  []

  [outlet]
    type = Outlet1Phase
    input = fch1:out
    p = 1e-5
  []
[]

[Executioner]
  type = Transient
  dt = 1.e-2
[]

(modules/thermal_hydraulics/test/tests/postprocessors/real_component_parameter_value/non_existent_par_name.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0.0

  scaling_factor_1phase = '1 1 1e-5'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 50

    A   = 1.0000000000e-04
    D_h = 1.1283791671e-02

    f = 0.0

    fp = fp
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 1e5
    T0 = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Functions]
  [p_fn]
    type = PiecewiseLinear
    x = '0   1'
    y = '1e5 1.001e5'
  []
[]

[ControlLogic]
  [outlet_p_fn]
    type = GetFunctionValueControl
    function = p_fn
  []

  [set_outlet_value]
    type = SetComponentRealValueControl
    component = outlet
    parameter = p
    value = outlet_p_fn:value
  []
[]

[Postprocessors]
  [outlet_p]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = p
  []
[]


[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0.0
  dt = 0.25
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'

  nl_rel_tol = 1e-5
  nl_abs_tol = 1e-6
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

(modules/thermal_hydraulics/test/tests/controls/pid_control/test.i)

# This test "measures" the liquid temperature at location (10, 0, 0) on a 15 meters
# long pipe and adjusts the inlet stagnation temperature using a PID controller with
# set point at 340 K.  The pipe is filled with water at T = 350 K. The purpose is to
# make sure that the channel fills with colder liquid and levels at the set point
# value. In steady state there should be a flat temperature profile at ~340 K.

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 15.0
    n_elems = 10
    A   = 0.01
    D_h = 0.1
    f = 0.01
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 105.e3
    T0 = 300.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[ControlLogic]
  [T_set_point]
    type = GetFunctionValueControl
    function = 340
  []

  [pid_ctrl]
    type = PIDControl
    input = T_reading
    set_point = T_set_point:value
    K_i = 0.05
    K_p = 0.2
    K_d = 0.1
    initial_value = 340
  []

  [set_inlet_value]
    type = SetComponentRealValueControl
    component = inlet
    parameter = T0
    value = pid_ctrl:output
  []
[]

[Postprocessors]
  [T_reading]
    type = PointValue
    point = '10 0 0'
    variable = T
    execute_on = timestep_begin
  []

  [T_inlet]
    type = PointValue
    point = '0 0 0'
    variable = T
    execute_on = timestep_begin
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0.0
  end_time = 300.0
[]

[Outputs]
  [out]
    type = CSV
    execute_on = 'final'
  []

  [console]
    type = Console
    max_rows = 1
  []
[]

(modules/thermal_hydraulics/test/tests/components/deprecated/junction_one_to_one.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  closures = simple_closures
  fp = fp

  f = 0.0

  initial_T = 300
  initial_p = 1e5
  initial_vel = 0
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
    molar_mass = 0.02897
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 1
    T = 300
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 2
    A = 0.1
  []

  [valve]
    type = JunctionOneToOne
    connections = 'pipe1:out pipe2:in'
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '0.5 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 2
    A = 0.1
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2

  solve_type = NEWTON
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 20

  l_tol = 1e-4

  start_time = 0.0
  end_time = 1.0
  dt = 0.01
  abort_on_solve_fail = true
[]

(modules/thermal_hydraulics/test/tests/components/inlet_stagnation_p_t_1phase/clg.ctrl_T0_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0.0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 50

    A   = 1.0000000000e-04
    D_h = 1.1283791671e-02

    f = 0.0

    fp = fp
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 1.01e5
    T0 = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Functions]
  [inlet_T0_fn]
    type = PiecewiseLinear
    x = '0   1'
    y = '300 350'
  []
[]

[ControlLogic]
  [set_inlet_value]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = T0
    function = inlet_T0_fn
  []
[]

[Postprocessors]
  [inlet_T0]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = T0
  []
[]


[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0.0
  dt = 0.25
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'

  nl_rel_tol = 1e-5
  nl_abs_tol = 1e-6
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  automatic_scaling = true
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/inlet_mass_flow_rate_1phase/clg.ctrl_m_dot_3eqn_rdg.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0.0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 50

    A   = 1.0000000000e-04
    D_h = 1.1283791671e-02

    f = 0.0

    fp = fp
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0
    T = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Functions]
  [inlet_m_dot_fn]
    type = PiecewiseLinear
    x = '0  1'
    y = '0  0.5'
  []
[]

[ControlLogic]
  [set_inlet_value]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = m_dot
    function = inlet_m_dot_fn
  []
[]

[Postprocessors]
  [inlet_m_dot]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = m_dot
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0.0
  dt = 0.25
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'

  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-6
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/junction_parallel_channels_1phase/junction_with_calorifically_imperfect_gas.i)

# This input file tests compatibility of JunctionParallelChannels1Phase and CaloricallyImperfectGas.
# Loss coefficient is applied in first junction.
# Expected pressure drop from form loss ~0.5*K*rho_in*vel_in^2=0.5*100*3.219603*1 = 160.9 Pa
# Pressure drop from averall flow area change ~ 21.9 Pa
# Expected pressure drop ~ 182.8 Pa

T_in = 523.0
vel = 1
p_out = 7e6

[GlobalParams]
  initial_p = ${p_out}
  initial_vel = ${vel}
  initial_T = ${T_in}
  gravity_vector = '0 0 0'
  closures = simple_closures
  n_elems = 3
  f = 0

  scaling_factor_1phase = '1 1 1e-5'
  scaling_factor_rhoV = '1e2'
  scaling_factor_rhowV = '1e-2'
  scaling_factor_rhoEV = '1e-5'
[]

[Functions]
  [e_fn]
    type = PiecewiseLinear
    x = '100   280 300 350 400 450 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 5000'
    y = '783.9 2742.3 2958.6 3489.2 4012.7 4533.3 5053.8 5574 6095.1 7140.2 8192.9 9256.3 10333.6 12543.9 14836.6 17216.3 19688.4 22273.7 25018.3 28042.3 31544.2 35818.1 41256.5 100756.5'
    scale_factor = 1e3
  []

  [mu_fn]
    type = PiecewiseLinear
    x = '100   280 300 350 400 450 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 5000'
    y = '85.42 85.42 89.53 99.44 108.9 117.98 126.73 135.2 143.43 159.25 174.36 188.9 202.96 229.88 255.5 280.05 303.67 326.45 344.97 366.49 387.87 409.48 431.86 431.86'
    scale_factor = 1e-7
  []

  [k_fn]
    type = PiecewiseLinear
    x = '100 280 300 350 400 450 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 5000'
    y = '186.82 186.82 194.11 212.69 231.55 250.38 268.95 287.19 305.11 340.24 374.92 409.66 444.75 511.13 583.42 656.44 733.32 826.53 961.15 1180.38 1546.31 2135.49 3028.08 3028.08'
    scale_factor = 1e-3
  []
[]

[FluidProperties]
  [fp]
    type = CaloricallyImperfectGas
    molar_mass = 0.002
    e = e_fn
    k = k_fn
    mu = mu_fn
    min_temperature = 100
    max_temperature = 5000
    out_of_bound_error = false
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet_bc]
    type = InletVelocityTemperature1Phase
    input = 'inlet:in'
    vel = ${vel}
    T = ${T_in}
  []
  [inlet]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 11'
    orientation = '0 0 -1'
    length = 1
    A = 3
  []
  [inlet_plenum]
    type = JunctionParallelChannels1Phase
    position = '0 0 10'
    initial_vel_x = 0
    initial_vel_y = 0
    initial_vel_z = ${vel}
    K = 100
    connections = 'inlet:out channel1:in channel2:in'
    volume = 1
    use_scalar_variables = false
  []
  [channel1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 10'
    orientation = '0 0 -1'
    length = 10
    A = 4
    D_h = 1
  []
  [channel2]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 10'
    orientation = '0 0 -1'
    length = 10
    A = 1
    D_h = 1
  []
  [outlet_plenum]
    type = JunctionParallelChannels1Phase
    position = '0 0 0'
    initial_vel_x = 1
    initial_vel_y = 0
    initial_vel_z = ${vel}
    connections = 'channel1:out channel2:out outlet:in'
    volume = 1
    use_scalar_variables = false
  []
  [outlet]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '0 0 -1'
    length = 1
    A = 1
  []
  [outlet_bc]
    type = Outlet1Phase
    p = ${p_out}
    input = 'outlet:out'
  []
[]

[Postprocessors]
  [p_in]
    type = SideAverageValue
    variable = p
    boundary = inlet:in
  []
  [p_out]
    type = SideAverageValue
    variable = p
    boundary = outlet:out
  []
  [Delta_p]
    type = DifferencePostprocessor
    value1 = p_out
    value2 = p_in
  []
  [inlet_in_m_dot]
    type = ADFlowBoundaryFlux1Phase
    boundary = 'inlet_bc'
    equation = mass
  []
  [inlet_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'inlet:out'
    connection_index = 0
    junction = inlet_plenum
    equation = mass
  []

  [channel1_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel1:in'
    connection_index = 1
    junction = inlet_plenum
    equation = mass
  []
  [channel1_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel1:out'
    connection_index = 0
    junction = outlet_plenum
    equation = mass
  []

  [channel2_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel2:in'
    connection_index = 2
    junction = inlet_plenum
    equation = mass
  []
  [channel2_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel2:out'
    connection_index = 1
    junction = outlet_plenum
    equation = mass
  []

  [outlet_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'outlet:in'
    connection_index = 2
    junction = outlet_plenum
    equation = mass
  []
  [outlet_out_m_dot]
    type = ADFlowBoundaryFlux1Phase
    boundary = 'outlet_bc'
    equation = mass
  []

  [net_mass_flow_rate_domain]
    type = LinearCombinationPostprocessor
    pp_names = 'inlet_in_m_dot outlet_out_m_dot'
    pp_coefs = '1 -1'
  []
  [net_mass_flow_rate_volume_junction]
    type = LinearCombinationPostprocessor
    pp_names = 'inlet_out_m_dot channel1_in_m_dot channel2_in_m_dot'
    pp_coefs = '1 -1 -1'
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2
  start_time = 0
  end_time = 20
  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 1
    optimal_iterations = 8
    iteration_window = 2
  []
  timestep_tolerance = 1e-6
  abort_on_solve_fail = true

  line_search = basic
  nl_rel_tol = 1e-8
  nl_abs_tol = 2e-8
  nl_max_its = 25
  l_tol = 1e-3
  l_max_its = 5
  petsc_options = '-snes_converged_reason'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu     '
[]

[Outputs]
  [out]
    type = CSV
    execute_on = 'FINAL'
    show = 'net_mass_flow_rate_domain net_mass_flow_rate_volume_junction Delta_p'
  []
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_heat_structure_3d/err.not_a_3d_hs.i)

[GlobalParams]
  scaling_factor_1phase = '1 1 1e-3'
[]

[SolidProperties]
  [mat]
    type = ThermalFunctionSolidProperties
    rho = 1000
    cp = 100
    k = 30
  []
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [T_init]
    type = ParsedFunction
    expression = '1000*y+300+30*z'
  []
[]

[Components]
  [fch]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    fp = fp
    n_elems = 6
    length = 1
    initial_T = 300
    initial_p = 1.01e5
    initial_vel = 1
    closures = simple_closures
    A   = 0.00314159
    D_h  = 0.2
    f = 0.01
  []
  [in]
    type = InletVelocityTemperature1Phase
    input = 'fch:in'
    vel = 1
    T = 300
  []
  [out]
    type = Outlet1Phase
    input = 'fch:out'
    p = 1.01e5
  []
  [blk]
    type = HeatStructureCylindrical
    position = '0 0 0'
    orientation = '0 0 1'
    widths = 0.1
    inner_radius = 0.1
    length = 1
    n_elems = 6
    n_part_elems = 1
    initial_T = T_init
    solid_properties = 'mat'
    solid_properties_T_ref = '300'
    names = blk
  []
  [ht]
    type = HeatTransferFromHeatStructure3D1Phase
    flow_channels = 'fch'
    hs = blk
    boundary = blk:inner
    Hw = 10000
    P_hf = 0.156434465
  []
[]

[Postprocessors]
  [energy_hs]
    type = HeatStructureEnergy3D
    block = blk:0
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [energy_fch]
    type = ElementIntegralVariablePostprocessor
    block = fch
    variable = rhoEA
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [total_energy]
    type = SumPostprocessor
    values = 'energy_fch energy_hs'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [energy_change]
    type = ChangeOverTimePostprocessor
    change_with_respect_to_initial = true
    postprocessor = total_energy
   compute_relative_change = false
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 1
  solve_type = PJFNK
  line_search = basic
  num_steps = 1000
  steady_state_detection = true
  steady_state_tolerance = 1e-08
  nl_abs_tol = 1e-8
[]

(modules/thermal_hydraulics/test/tests/components/inlet_mass_flow_rate_1phase/jac.massflowrate_3eqn_water97.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 444.447
  initial_p = 7e6
  initial_vel = 0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = Water97FluidProperties
    T_initial_guess = 444.447
    p_initial_guess = 7e6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A   = 1.0000000000e-04
    D_h  = 1.1283791671e-02
    f = 0.1
    length = 1
    n_elems = 4
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.18
    T     = 444.447
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 7e6
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 0.1
  start_time = 0.0
  num_steps = 30

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 100

  abort_on_solve_fail = true

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  exodus = true
[]

(modules/thermal_hydraulics/test/tests/postprocessors/flow_boundary_flux_1phase/test.i)

T_in = 300
p_out = 1e5

[GlobalParams]
  initial_p = ${p_out}
  initial_T = ${T_in}
  initial_vel = 0
  gravity_vector = '0 0 0'
  closures = simple_closures
  n_elems = 50
  f = 0
  scaling_factor_1phase = '1 1e-2 1e-4'
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'channel:in'
    m_dot = 0.1
    T = ${T_in}
  []
  [channel]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    A = 3
  []
  [outlet]
    type = Outlet1Phase
    p = ${p_out}
    input = 'channel:out'
  []
[]

[Postprocessors]
  [m_dot_in]
    type = ADFlowBoundaryFlux1Phase
    boundary = 'inlet'
    equation = mass
  []
  [m_dot_out]
    type = ADFlowBoundaryFlux1Phase
    boundary = 'outlet'
    equation = mass
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2
  start_time = 0
  num_steps = 10
  dt = 0.1

  solve_type = NEWTON
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 25
  l_tol = 1e-3
  l_max_its = 5

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'
[]

[Outputs]
  [out]
    type = CSV
    show = 'm_dot_in m_dot_out'
    execute_on = 'final'
  []
[]

(modules/thermal_hydraulics/test/tests/components/flow_channel_1phase/phy.f_fn.3eqn.i)

# Tests that friction factor can be provided for 1-phase flow

f = 5

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 558
  initial_p = 7.0e6
  initial_vel = 0

  scaling_factor_1phase = '1e0 1e-2 1e-4'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [f_func]
    type = ConstantFunction
    value = ${f}
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 1

    A   = 1.907720E-04
    D_h  = 1.698566E-02
    f = f_func

    fp = eos
  []

  [ht_pipe]
    type = HeatTransferFromSpecifiedTemperature1Phase
    flow_channel = pipe
    T_wall = 559
    P_hf = 0.0489623493599167
    Hw = 50000
  []

  [inlet]
    type = InletDensityVelocity1Phase
    input = 'pipe:in'
    rho = 741.707129779398883
    vel = 2
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 7.0e6
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 1
  num_steps = 1
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-8
  nl_max_its = 30

  l_tol = 1e-2
  l_max_its = 30
[]

[Postprocessors]
  [f]
    type = ADElementIntegralMaterialProperty
    mat_prop = f_D
    block = pipe
  []
[]

[Outputs]
  csv = true
  show = 'f'
  execute_on = 'timestep_end'
[]

(modules/thermal_hydraulics/test/tests/problems/william_louis/3pipes_open.i)

# Junction of 3 pipes:
#
#   1     3
# -----*-----
#      | 2
#
# The left end of Pipe 1 is a high-pressure region, and the rest of the system
# is at a low pressure.
#
# Pipe 1 is closed, while Pipes 2 and 3 are open.

end_time = 0.07

D_pipe = 0.01
A_pipe = ${fparse 0.25 * pi * D_pipe^2}
length_pipe1_HP = 0.53
length_pipe1_LP = 3.10
length_pipe2 = 2.595
length_pipe3 = 1.725

x_junction = ${fparse length_pipe1_HP + length_pipe1_LP}

# Numbers of elements correspond to dx ~ 1/3 cm
n_elems_pipe1_HP = 159
n_elems_pipe1_LP = 930
n_elems_pipe2 = 779
n_elems_pipe3 = 518

S_junction = ${fparse 3 * A_pipe}
r_junction = ${fparse sqrt(S_junction / (4 * pi))}
V_junction = ${fparse 4/3 * pi * r_junction^3}

p_low = 1e5
p_high = 1.15e5

T_low  = 283.5690633 # at p = 1e5 Pa,    rho = 1.23 kg/m^3
T_high = 283.5690633 # at p = 1.15e5 Pa, rho = 1.4145 kg/m^3

cfl = 0.95

[GlobalParams]
  # common FlowChannel1Phase parameters
  A = ${A_pipe}
  initial_vel = 0
  fp = fp_air
  closures = closures
  f = 0
  gravity_vector = '0 0 0'
  scaling_factor_1phase = '1 1 1e-5'
[]

[FluidProperties]
  [fp_air]
    type = IdealGasFluidProperties
    gamma = 1.4
    molar_mass = 0.029
  []
[]

[Closures]
  [closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [initial_T_pipe1_fn]
    type = PiecewiseConstant
    axis = x
    x = '0 ${length_pipe1_HP}'
    y = '${T_high} ${T_low}'
  []
  [initial_p_pipe1_fn]
    type = PiecewiseConstant
    axis = x
    x = '0 ${length_pipe1_HP}'
    y = '${p_high} ${p_low}'
  []
[]

[Components]
  [pipe1_wall]
    type = SolidWall1Phase
    input = 'pipe1:in'
  []
  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = '${length_pipe1_HP} ${length_pipe1_LP}'
    n_elems = '${n_elems_pipe1_HP} ${n_elems_pipe1_LP}'
    initial_p = initial_p_pipe1_fn
    initial_T = initial_T_pipe1_fn
  []

  [junction]
    type = VolumeJunction1Phase
    position = '${x_junction} 0 0'
    connections = 'pipe1:out pipe2:in pipe3:in'
    initial_p = ${p_low}
    initial_T = ${T_low}
    initial_vel_x = 0
    initial_vel_y = 0
    initial_vel_z = 0
    volume = ${V_junction}
    scaling_factor_rhoEV = 1e-5
    apply_velocity_scaling = true
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '${x_junction} 0 0'
    orientation = '0 -1 0'
    length = ${length_pipe2}
    n_elems = ${n_elems_pipe2}
    initial_p = ${p_low}
    initial_T = ${T_low}
  []
  [pipe2_outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = ${p_low}
  []

  [pipe3]
    type = FlowChannel1Phase
    position = '${x_junction} 0 0'
    orientation = '1 0 0'
    length = ${length_pipe3}
    n_elems = ${n_elems_pipe3}
    initial_p = ${p_low}
    initial_T = ${T_low}
  []
  [pipe3_outlet]
    type = Outlet1Phase
    input = 'pipe3:out'
    p = ${p_low}
  []
[]

[Postprocessors]
  [cfl_dt]
    type = ADCFLTimeStepSize
    CFL = ${cfl}
    c_names = 'c'
    vel_names = 'vel'
  []
  [p_pipe1_048]
    type = PointValue
    variable = p
    point = '${fparse x_junction - 0.48} 0 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_pipe2_052]
    type = PointValue
    variable = p
    point = '${fparse x_junction} -0.52 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_pipe3_048]
    type = PointValue
    variable = p
    point = '${fparse x_junction + 0.48} 0 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  end_time = ${end_time}

  [TimeIntegrator]
    type = ExplicitSSPRungeKutta
    order = 1
  []

  [TimeStepper]
    type = PostprocessorDT
    postprocessor = cfl_dt
  []
  abort_on_solve_fail = true

  solve_type = LINEAR
[]

[Times]
  [output_times]
    type = TimeIntervalTimes
    time_interval = 7e-4
  []
[]

[Outputs]
  file_base = '3pipes_open'
  [csv]
    type = CSV
    show = 'p_pipe1_048 p_pipe2_052 p_pipe3_048'
    sync_only = true
    sync_times_object = output_times
  []
  [console]
    type = Console
    execute_postprocessors_on = 'NONE'
  []
[]

(modules/thermal_hydraulics/test/tests/controls/set_component_real_value_control/test.i)

# This is testing that the values set by SetComponentRealValueControl are used.
# Function T0_fn prescribes values for T0 at inlet. We output the function
# values via a postprocessor `T_fn` and the inlet values via another
# postprocessor `T_ctrl`. Those two values have to be equal.

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 15.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 100.e3
    T0 = 350.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[Functions]
  [T0_fn]
    type = PiecewiseLinear
    x = '0 1'
    y = '350 345'
  []
[]

[ControlLogic]
  [T_inlet_fn]
    type = GetFunctionValueControl
    function = T0_fn
  []

  [set_inlet_value]
    type = SetComponentRealValueControl
    component = inlet
    parameter = T0
    value = T_inlet_fn:value
  []
[]

[Postprocessors]
  [T_fn]
    type = FunctionValuePostprocessor
    function = T0_fn
  []

  [T_ctrl]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = T0
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 0.1
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0.0
  end_time = 1
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/junction_parallel_channels_1phase/phy.shower.i)

# This problem models a "shower": water from two pipes, one hot and one cold,
# mixes together to produce a temperature between the two.

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 300
  initial_p = 1e5
  initial_vel = 1
  initial_vel_x = 1
  initial_vel_y = 0
  initial_vel_z = 0

  # global parameters for pipes
  fp = eos
  orientation = '1 0 0'
  length = 1
  n_elems = 20
  f = 0

  scaling_factor_1phase = '1 1 1e-6'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = IdealGasFluidProperties
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet_hot]
    type = InletDensityVelocity1Phase
    input = 'pipe_hot:in'
    # rho @ (p = 1e5, T = 310 K)
    rho = 1315.9279785683
    vel = 1
  []
  [inlet_cold]
    type = InletDensityVelocity1Phase
    input = 'pipe_cold:in'
    # rho @ (p = 1e5, T = 280 K)
    rho = 1456.9202619863
    vel = 1
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe_warm:out'
    p = 1e5
  []

  [pipe_hot]
    type = FlowChannel1Phase
    position = '0 1 0'
    A = 1
  []
  [pipe_cold]
    type = FlowChannel1Phase
    position = '0 0 0'
    A = 1
  []
  [pipe_warm]
    type = FlowChannel1Phase
    position = '1 0.5 0'
    A = 2
    initial_vel = 0.5
  []

  [junction]
    type = JunctionParallelChannels1Phase
    connections = 'pipe_cold:out pipe_hot:out pipe_warm:in'
    position = '1 0.5 0'
    volume = 1e-8
    use_scalar_variables = false
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-5
  nl_max_its = 10

  l_tol = 1e-2
  l_max_its = 10

  start_time = 0
  end_time = 5
  dt = 0.05

  abort_on_solve_fail = true
[]

[Postprocessors]
  # These post-processors are used to test that the energy flux on
  # the warm side of the junction is equal to the sum of the energy
  # fluxes of the hot and cold inlets to the junction.
  [energy_flux_hot]
    type = EnergyFluxIntegral
    boundary = pipe_hot:out
    arhouA = rhouA
    H = H
  []
  [energy_flux_cold]
    type = EnergyFluxIntegral
    boundary = pipe_cold:out
    arhouA = rhouA
    H = H
  []
  [energy_flux_warm]
    type = EnergyFluxIntegral
    boundary = pipe_warm:in
    arhouA = rhouA
    H = H
  []
  [energy_flux_inlet_sum]
    type = SumPostprocessor
    values = 'energy_flux_hot energy_flux_cold'
  []
  [test_rel_err]
    type = RelativeDifferencePostprocessor
    value1 = energy_flux_warm
    value2 = energy_flux_inlet_sum
  []
[]

[Outputs]
  [out]
    type = CSV
    show = test_rel_err
    sync_only = true
    sync_times = '3 4 5'
  []
[]

(modules/thermal_hydraulics/test/tests/misc/adapt/single_block.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 20
    A   = 1.0000000000e-04
    D_h  = 1.1283791671e-02
    f = 0.
    fp = eos
  []

  [inlet]
    type = InletDensityVelocity1Phase
    input = 'pipe1:in'
    rho = 996.561962436227759
    vel = 1
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 1e5
  []
[]

[Outputs]
  exodus = true
  show = 'rhoA rhouA rhoEA'

  [console]
    type = Console
    print_mesh_changed_info = true
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  start_time = 0.0
  dt = 1e-5
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'

  [Adaptivity]
    initial_adaptivity = 0 # There seems to be a bug with non-zero initial adaptivity
    refine_fraction = 0.60
    coarsen_fraction = 0.30
    max_h_level = 4
  []
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_heat_structure_3d/phy.conservation_ss.i)

# Testing energy conservation at steady state

P_hf = ${fparse 0.6 * sin (pi/24)}

[GlobalParams]
  scaling_factor_1phase = '1 1 1e-3'
  gravity_vector = '0 0 0'
[]

[Materials]
  [mat]
    type = ADGenericConstantMaterial
    block = 'blk:0'
    prop_names = 'density specific_heat thermal_conductivity'
    prop_values = '1000 10 30'
  []
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]


[Components]
  [in1]
    type = InletVelocityTemperature1Phase
    input = 'fch1:in'
    vel = 1
    T = 300
  []
  [fch1]
    type = FlowChannel1Phase
    position = '0.15 0 0'
    orientation = '0 0 1'
    fp = fp
    n_elems = 10
    length = 1
    initial_T = 300
    initial_p = 1.01e5
    initial_vel = 1
    closures = simple_closures
    A = 0.00314159
    f = 0.0
  []
  [out1]
    type = Outlet1Phase
    input = 'fch1:out'
    p = 1.01e5
  []

  [in2]
    type = InletVelocityTemperature1Phase
    input = 'fch2:in'
    vel = 1
    T = 350
  []
  [fch2]
    type = FlowChannel1Phase
    position = '0 0.15 0'
    orientation = '0 0 1'
    fp = fp
    n_elems = 10
    length = 1
    initial_T = 350
    initial_p = 1.01e5
    initial_vel = 1
    closures = simple_closures
    A = 0.00314159
    f = 0
  []
  [out2]
    type = Outlet1Phase
    input = 'fch2:out'
    p = 1.01e5
  []

  [blk]
    type = HeatStructureFromFile3D
    file = mesh.e
    position = '0 0 0'
    initial_T = 325
  []
  [ht]
    type = HeatTransferFromHeatStructure3D1Phase
    flow_channels = 'fch1 fch2'
    hs = blk
    boundary = blk:rmin
    Hw = 10000
    P_hf = ${P_hf}
  []
[]

[Postprocessors]
  [E_in1]
    type = ADFlowBoundaryFlux1Phase
    boundary = in1
    equation = energy
    execute_on = 'initial timestep_end'
  []
  [E_out1]
    type = ADFlowBoundaryFlux1Phase
    boundary = out1
    equation = energy
    execute_on = 'initial timestep_end'
  []
  [hf_pipe1]
    type = ADHeatRateConvection1Phase
    block = fch1
    T_wall = T_wall
    T = T
    Hw = Hw
    P_hf = ${P_hf}
    execute_on = 'initial timestep_end'
  []
  [E_diff1]
    type = DifferencePostprocessor
    value1 = E_in1
    value2 = E_out1
    execute_on = 'initial timestep_end'
  []
  [E_conservation1]
    type = SumPostprocessor
    values = 'E_diff1 hf_pipe1'
  []
  [E_in2]
    type = ADFlowBoundaryFlux1Phase
    boundary = in2
    equation = energy
    execute_on = 'initial timestep_end'
  []
  [E_out2]
    type = ADFlowBoundaryFlux1Phase
    boundary = out2
    equation = energy
    execute_on = 'initial timestep_end'
  []
  [hf_pipe2]
    type = ADHeatRateConvection1Phase
    block = fch2
    T_wall = T_wall
    T = T
    Hw = Hw
    P_hf = ${P_hf}
    execute_on = 'initial timestep_end'
  []
  [E_diff2]
    type = DifferencePostprocessor
    value1 = E_in2
    value2 = E_out2
    execute_on = 'initial timestep_end'
  []
  [E_conservation2]
    type = SumPostprocessor
    values = 'E_diff2 hf_pipe2'
  []
  [E_conservation_hs]
    type = SumPostprocessor
    values = 'hf_pipe1 hf_pipe2'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2
  dt = 5
  end_time = 100

  solve_type = NEWTON
  line_search = basic
  abort_on_solve_fail = true
  nl_abs_tol = 1e-8
[]

[Outputs]
  file_base = 'phy.conservation_ss'
  [csv]
    type = CSV
    show = 'E_conservation1 E_conservation2 E_conservation_hs'
    execute_on = 'FINAL'
  []
[]

(modules/thermal_hydraulics/test/tests/components/inlet_density_velocity_1phase/phy.densityvelocity_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 510
  initial_p = 7e6
  initial_vel = 0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A   = 3.1415926536e-06
    D_h  = 2.0000000000e-03
    f = 0.1
    length = 1
    n_elems = 10
  []

  [inlet]
    type = InletDensityVelocity1Phase
    input = 'pipe:in'
    rho = 805
    vel = 1
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 7e6
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 1e-1
  start_time = 0.0
  num_steps = 50
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-7
  nl_max_its = 5

  l_tol = 1e-3
  l_max_its = 100
[]

[Outputs]
  exodus = true
  execute_on = 'final'
  velocity_as_vector = false
  show = 'rho vel'
[]

(modules/thermal_hydraulics/test/tests/components/pump_1phase/pump_pressure_check.i)

# This test checks that the expected pressure rise due to the user supplied
# pump head matches the actual pressure rise across the pump.
# The orientation of flow channels in this test have no components in the z-direction
# due to the expected_pressure_rise_fcn not accounting for hydrostatic pressure.

head = 95.
dt = 0.1
g = 9.81
volume = 0.567

[GlobalParams]
  initial_T = 393.15
  initial_vel = 0.0372
  A = 0.567
  f = 0
  fp = fp
  scaling_factor_1phase = '1 1 1e-5'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [expected_pressure_rise_fcn]
    type = ParsedFunction
    expression = 'rhoV * g * head / volume'
    symbol_names = 'rhoV g head volume'
    symbol_values = 'pump_rhoV ${g} ${head} ${volume}'
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 20
    T = 393.15
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    initial_p = 1.318964e+07
    n_elems = 10
  []

  [pump]
    type = Pump1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1.02 0 0'
    initial_p = 1.318964e+07
    scaling_factor_rhoEV = 1e-5
    head = ${head}
    volume = ${volume}
    A_ref = 0.567
    initial_vel_x = 1
    initial_vel_y = 1
    initial_vel_z = 0
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1.04 0 0'
    orientation = '0 2 0'
    length = 0.96
    initial_p = 1.4072E+07
    n_elems = 10
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1.4072E+07
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'implicit-euler'
  start_time = 0
  dt = ${dt}
  num_steps = 4
  abort_on_solve_fail = true
  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-6
  nl_max_its = 15
  l_tol = 1e-4
  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Postprocessors]
  [pump_rhoV]
    type = ElementAverageValue
    variable = rhoV
    block = 'pump'
    execute_on = 'initial timestep_end'
  []
  [expected_pressure_rise]
    type = FunctionValuePostprocessor
    function = expected_pressure_rise_fcn
    indirect_dependencies = 'pump_rhoV'
    execute_on = 'initial timestep_end'
  []
  [p_inlet]
    type = SideAverageValue
    variable = p
    boundary = 'pipe1:out'
    execute_on = 'initial timestep_end'
  []
  [p_outlet]
    type = SideAverageValue
    variable = p
    boundary = 'pipe2:in'
    execute_on = 'initial timestep_end'
  []
  [actual_pressure_rise]
    type = DifferencePostprocessor
    value1 = p_outlet
    value2 = p_inlet
    execute_on = 'timestep_end'
  []
  [pressure_rise_diff]
    type = RelativeDifferencePostprocessor
    value1 = actual_pressure_rise
    value2 = expected_pressure_rise
    execute_on = 'timestep_end'
  []
[]

[Outputs]
  [out]
    type = CSV
    execute_on = 'FINAL'
    show = 'pressure_rise_diff'
  []
[]

(modules/thermal_hydraulics/test/tests/components/junction_parallel_channels_1phase/equal_area_with_junction.i)

# Tests a junction between 2 flow channels of equal area and orientation. A
# sinusoidal density shape is advected to the right and should not be affected
# by the junction; the solution should be identical to the equivalent
# no-junction solution.

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_vel = 1

  A = 25

  f = 0

  fp = fp

  scaling_factor_1phase = '0.04 0.04 0.04e-5'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    p_inf = 0
    q = 0
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [T0]
    type = CosineHumpFunction
    axis = x
    hump_center_position = 1
    hump_width = 0.5
    hump_begin_value = 250
    hump_center_value = 300
  []
[]

[Components]
  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    # Stagnation property with p = 1e5 Pa, T = 250 K, vel = 1 m/s
    p0 = 100000.68965687
    T0 = 250.00049261084
  []

  [pipe1]
    type = FlowChannel1Phase

    position = '0 0 0'
    orientation = '1 0 0'
    length = 1

    initial_T = T0

    n_elems = 25
  []

  [junction]
    type = JunctionParallelChannels1Phase
    connections = 'pipe1:out pipe2:in'

    position = '1.02 0 0'
    volume = 1.0

    initial_T = T0
    initial_vel_x = 1
    initial_vel_y = 0
    initial_vel_z = 0

    scaling_factor_rhoV  = 1
    scaling_factor_rhouV = 1
    scaling_factor_rhovV = 1
    scaling_factor_rhowV = 1
    scaling_factor_rhoEV = 1e-5

    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase

    position = '1.04 0 0'
    orientation = '1 0 0'
    length = 0.96

    initial_T = T0

    n_elems = 24
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  scheme = 'bdf2'
  start_time = 0
  dt = 0.01
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 10

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Postprocessors]
  [junction_rho]
    type = ElementAverageValue
    variable = rhoV
    block = 'junction'
    execute_on = 'initial timestep_end'
  []
  [junction_rhou]
    type = ElementAverageValue
    variable = rhouV
    block = 'junction'
    execute_on = 'initial timestep_end'
  []
  [junction_rhoE]
    type = ElementAverageValue
    variable = rhoEV
    block = 'junction'
    execute_on = 'initial timestep_end'
  []
[]

[Outputs]
  [out]
    type = CSV
    execute_scalars_on = 'none'
    execute_on = 'initial timestep_end'
  []
[]

(modules/thermal_hydraulics/test/tests/components/inlet_stagnation_p_t_1phase/phy.stagnation_p_T_transient_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 101325
  initial_T = 300
  initial_vel = 0

  scaling_factor_1phase = '1 1 1e-4'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = eos
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A = 1.
    f = 0.0

    length = 1
    n_elems = 10
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 102041.128
    T0 = 300.615
    reversible = false
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 101325
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 1e-4
  num_steps = 10
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-7
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100
[]


[Outputs]
  [out]
    type = Exodus
  []
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/problems/three_pipe_shock/three_pipe_shock.i)

# Test 8 from the following reference:
#
#   F. Daude, P. Galon. A Finite-Volume approach for compressible single- and
#   two-phase flows in flexible pipelines with fluid-structure interaction.
#   Journal of Computational Physics 362 (2018) 375-408.

L1 = 10
L2 = 3
L3 = 5

xJ = ${L1}
x_p1 = ${fparse xJ - 1.05}
x_p2 = ${fparse xJ + 0.15}
x_p3 = ${fparse xJ + 0.95}

N1 = 1000
N2 = 300
N3 = 500

D1 = 0.35682482
D2 = 0.19544100
D3 = 0.35682482

A1 = ${fparse 0.25 * pi * D1^2}
A2 = ${fparse 0.25 * pi * D2^2}
A3 = ${fparse 0.25 * pi * D3^2}
AJ = ${fparse A1 + A2 + A3}
RJ = ${fparse sqrt(AJ / (4 * pi))} # A = 4 pi R^2
VJ = ${fparse 4/3 * pi * RJ^3}

y2 = 1
y3 = -1

gamma = 2.23
p_inf = 1e9 # denoted by "pi" in reference
q = 0
cv = 2500 # arbitrary value; not given in reference

CFL = 0.8
t_end = 0.01

p_out = 80e5

initial_p = ${p_out}
initial_T = 327.1864956 # reference has rho = 1001.89 kg/m^3
initial_vel1 = 1
initial_vel2 = 0.769
initial_vel3 = 0.769

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = ${initial_T}
  initial_p = ${initial_p}

  fp = fp
  closures = closures
  f = 0

  rdg_slope_reconstruction = none
  scaling_factor_1phase = '1 1 1e-5'
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = ${gamma}
    p_inf = ${p_inf}
    q = ${q}
    cv = ${cv}
  []
[]

[Closures]
  [closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = ${L1}
    n_elems = ${N1}
    A = ${A1}
    initial_vel = ${initial_vel1}
  []
  [pipe2]
    type = FlowChannel1Phase
    position = '${xJ} ${y2} 0'
    orientation = '1 0 0'
    length = ${L2}
    n_elems = ${N2}
    A = ${A2}
    initial_vel = ${initial_vel2}
  []
  [pipe3]
    type = FlowChannel1Phase
    position = '${xJ} ${y3} 0'
    orientation = '1 0 0'
    length = ${L3}
    n_elems = ${N3}
    A = ${A3}
    initial_vel = ${initial_vel3}
  []

  [junction]
    type = VolumeJunction1Phase
    connections = 'pipe1:out pipe2:in pipe3:in'
    position = '${xJ} 0 0'
    volume = ${VJ}
    initial_vel_x = ${initial_vel2} # ?
    initial_vel_y = 0
    initial_vel_z = 0
    scaling_factor_rhoEV = 1e-5
    apply_velocity_scaling = true
  []

  [outlet1]
    type = Outlet1Phase
    input = 'pipe1:in'
    p = ${p_out}
  []
  [outlet2]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = ${p_out}
  []
  [wall3]
    type = SolidWall1Phase
    input = 'pipe3:out'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Postprocessors]
  [dt_cfl]
    type = ADCFLTimeStepSize
    CFL = ${CFL}
    vel_names = 'vel'
    c_names = 'c'
  []
  [p1]
    type = PointValue
    variable = p
    point = '${x_p1} 0 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p2]
    type = PointValue
    variable = p
    point = '${x_p2} ${y2} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p3]
    type = PointValue
    variable = p
    point = '${x_p3} ${y3} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Executioner]
  type = Transient

  start_time = 0
  end_time = ${t_end}
  [TimeStepper]
    type = PostprocessorDT
    postprocessor = dt_cfl
  []
  [TimeIntegrator]
    type = ActuallyExplicitEuler
  []

  solve_type = LINEAR

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu     '

  l_tol = 1e-4
  l_max_its = 10
[]

[Times]
  [output_times]
    type = TimeIntervalTimes
    time_interval = 1e-4
  []
[]

[Outputs]
  file_base = 'three_pipe_shock'
  [csv]
    type = CSV
    show = 'p1 p2 p3'
    sync_only = true
    sync_times_object = output_times
  []
[]

(modules/thermal_hydraulics/test/tests/components/flow_channel_1phase/err.wrong_end.i)

[GlobalParams]
  gravity_vector = '0 0 0'
  scaling_factor_1phase = '1. 1e-4'

  closures = simple_closures
[]

[FluidProperties]
  [barotropic]
    type = LinearFluidProperties
    p_0 = 1.e5     # Pa
    rho_0 = 1.e3   # kg/m^3
    a2 = 1.e7      # m^2/s^2
    beta = .46e-3 # K^{-1}
    cv = 4.18e3    # J/kg-K, could be a global parameter?
    e_0 = 1.254e6  # J/kg
    T_0 = 300      # K
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = barotropic
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A = 1.
    D_h = 1.12837916709551
    f = 0.01
    length = 1
    n_elems = 100
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:asdf'      # this is an error we are checking for
    p0 = 1e5
    T0 = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 9.5e4
  []
[]

[Preconditioning]
  [FDP_PJFNK]
    type = FDP
    full = true

    petsc_options_iname = '-mat_fd_coloring_err'
    petsc_options_value = '1.e-10'
  []
[]


[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 1e-4
  dtmin = 1.e-7

  solve_type = 'PJFNK'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-8
  l_max_its = 100

  start_time = 0.0
  num_steps = 10
[]


[Outputs]
  [out]
    type = Exodus
  []
[]

(modules/thermal_hydraulics/test/tests/components/inlet_stagnation_p_t_1phase/phy.p0T0_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e6
  initial_T = 453.1
  initial_vel = 0.0

  scaling_factor_1phase = '1 1 1e-5'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 50

    A   = 1.0000000000e-04
    D_h  = 1.1283791671e-02

    f = 0.0

    fp = eos
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 1e6
    T0 = 453.1
    reversible = false
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 0.5e6
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'
  dt = 1.e-2
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-5
  nl_abs_tol = 1e-6
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100

  start_time = 0.0
  end_time = 0.6
[]

[Outputs]
  file_base = 'phy.p0T0_3eqn'
  [out]
    type = Exodus
  []
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/tutorials/single_phase_flow/02_core.i)

T_in = 300. # K
m_dot_in = 1e-2 # kg/s
press = 10e5 # Pa

# core parameters
core_length = 1. # m
core_n_elems = 25
core_dia = '${units 2. cm -> m}'
core_pitch = '${units 8.7 cm -> m}'
A_core = '${fparse core_pitch^2 - 0.25 *pi * core_dia^2}'
P_wet_core = '${fparse 4*core_pitch + pi * core_dia}'
Dh_core = '${fparse 4 * A_core / P_wet_core}'

tot_power = 2000 # W

[GlobalParams]
  initial_p = ${press}
  initial_vel = 0.0001
  initial_T = ${T_in}
  gravity_vector = '0 0 0'

  rdg_slope_reconstruction = minmod
  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = thm_closures
  fp = he
[]

[FluidProperties]
  [he]
    type = IdealGasFluidProperties
    molar_mass = 4e-3
    gamma = 1.67
    k = 0.2556
    mu = 3.22639e-5
  []
[]

[Closures]
  [thm_closures]
    type = Closures1PhaseTHM
  []
[]

[SolidProperties]
  [steel]
    type = ThermalFunctionSolidProperties
    rho = 8050
    k = 45
    cp = 466
  []
[]

[Components]
  [total_power]
    type = TotalPower
    power = ${tot_power}
  []
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'core_chan:in'
    m_dot = ${m_dot_in}
    T = ${T_in}
  []

  [core_chan]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    length = ${core_length}
    n_elems = ${core_n_elems}
    roughness = .0001
    A = '${A_core}'
    D_h = ${Dh_core}
  []

  [core_hs]
    type = HeatStructureCylindrical
    position = '0 0 0'
    orientation = '0 0 1'
    length = ${core_length}
    n_elems = ${core_n_elems}
    names = 'block'
    widths = '${fparse core_dia / 2.}'
    solid_properties = 'steel'
    solid_properties_T_ref = '300'
    n_part_elems = 3
  []

  [core_heating]
    type = HeatSourceFromTotalPower
    hs = core_hs
    regions = block
    power = total_power
  []

  [core_ht]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = core_chan
    hs = core_hs
    hs_side = outer
    P_hf = '${fparse pi * core_dia}'
  []

  [outlet]
    type = Outlet1Phase
    input = 'core_chan:out'
    p = ${press}
  []
[]

[Postprocessors]
  [power_to_coolant]
    type = ADHeatRateConvection1Phase
    block = core_chan
    P_hf = '${fparse pi *core_dia}'
  []

  [core_T_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = T
  []

  [core_p_in]
    type = SideAverageValue
    boundary = core_chan:in
    variable = p
  []

  [core_p_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = p
  []

  [core_delta_p]
    type = ParsedPostprocessor
    pp_names = 'core_p_in core_p_out'
    expression = 'core_p_in - core_p_out'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  start_time = 0

  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 10
  []
  end_time = 5000

  line_search = basic
  solve_type = NEWTON

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 25

[]

[Outputs]
  exodus = true

  [console]
    type = Console
    max_rows = 1
    outlier_variable_norms = false
  []
  print_linear_residuals = false
[]

(modules/thermal_hydraulics/test/tests/components/flow_connection/err.connecting_to_non_existent_component.i)

# Tests that we report an error if users try to connect to a non-existent component

[GlobalParams]
  initial_p = 1e5
  initial_T = 300
  initial_vel = 0
  closures = simple_closures
[]

[FluidProperties]
  [water]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = water
    position = '0 0 0'
    orientation = '0 1 0'
    length = 1
    n_elems = 2
    A = 1e-4
    f = 0
  []
  [inlet_1p]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 1
    T = 300
  []
  [outlet_1p]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 1e5
  []
[]

[Executioner]
  type = Transient
  dt = 0.01
[]

(modules/thermal_hydraulics/test/tests/misc/adapt/multiple_blocks.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = eos

    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 1

    f = 0
  []

  [pipe2]
    type = FlowChannel1Phase
    fp = eos

    position = '1 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 1

    f = 0
  []

  [junction]
    type = VolumeJunction1Phase
    connections = 'pipe1:out pipe2:in'
    volume = 1e-5
    position = '1 0 0'

    initial_vel_x = 0
    initial_vel_y = 0
    initial_vel_z = 0

    use_scalar_variables = false
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    # (p0, T0) for p = 1e5, T = 300, vel = 1
    p0 = 1.0049827846e+05
    T0 = 300.0000099
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Preconditioning]
  [prec]
    type = SMP
    full = true
    petsc_options = '-pc_factor_shift_nonzero'
    petsc_options_iname = '-mat_fd_coloring_err'
    petsc_options_value = '1.e-10'
  []
[]

[Executioner]
  type = Transient

  start_time = 0
  dt = 1e-4
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  nl_rel_tol = 0
  nl_abs_tol = 1e-5
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 10

  [Adaptivity]
    initial_adaptivity = 0
    refine_fraction = 0.60
    coarsen_fraction = 0.10
    max_h_level = 3
  []

  automatic_scaling = true
[]

[Outputs]
  exodus = true
[]

(modules/thermal_hydraulics/test/tests/controls/delay_control/test.i)

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 0
  initial_T = 300.
  closures = simple_closures
[]

[Functions]
  [p0_fn]
    type = PiecewiseLinear
    x = '0   0.2     0.4     0.6     0.8'
    y = '1e5 1.002e5 1.002e5 1.001e5 1.001e5'
  []
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1.0
    n_elems = 5
    A   = 0.01
    D_h = 0.1
    f = 0
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 100.e3
    T0 = 300.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[ControlLogic]
  [p0_fn_ctrl]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = p0
    function = p0_fn
  []

  [delay_ctrl]
    type = DelayControl
    input = p0_inlet
    tau = 0.3
    initial_value = 1e5
  []
[]

[Postprocessors]
  [p0_inlet_delayed]
    type = RealControlDataValuePostprocessor
    control_data_name = delay_ctrl:value
    execute_on = 'initial timestep_end'
  []

  [p0_inlet]
    type = FunctionValuePostprocessor
    function = p0_fn
    execute_on = 'initial timestep_begin'
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 0.1
  start_time = 0.0
  end_time = 1.0
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  automatic_scaling = true
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/inlet_mass_flow_rate_1phase/phy.massflowrate_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 444.447
  initial_p = 7e6
  initial_vel = 0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A   = 1.0000000000e-04
    D_h  = 1.1283791671e-02
    f = 0.1
    length = 1
    n_elems = 20
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.18
    T     = 444.447
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 7e6
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 0.1
  start_time = 0.0
  num_steps = 30

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 100

  abort_on_solve_fail = true

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  file_base = 'phy.massflowrate_3eqn'

  [exodus]
    type = Exodus
    show = 'rhouA T p'
  []
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_external_app_1phase/phy.T_wall_transfer_elem_3eqn.child.i)

# This is a part of phy.T_wall_transfer_elem_3eqn test. See the master file for details.

[GlobalParams]
  initial_p = 1.e5
  initial_vel = 0.
  initial_T = 300.

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10

    A   = 9.6858407346e-01
    D_h = 6.1661977237e+00
    f = 0.01

    fp = eos
  []

  [hxconn]
    type = HeatTransferFromExternalAppTemperature1Phase
    flow_channel = pipe1
    Hw = 3000
    P_hf = 6.2831853072e-01
    initial_T_wall = 300.
    var_type = elemental
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 1
    T = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 1e5
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'
  dt = 0.5
  dtmin = 1e-7
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-4
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 300

  start_time = 0.0
  end_time = 5
[]

[Outputs]
  [out]
    type = Exodus
    show = 'T_wall'
  []
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_external_app_1phase/phy.T_wall_transfer_3eqn.child.i)

# This is a part of phy.T_wall_transfer_3eqn test. See the master file for details.

[GlobalParams]
  initial_p = 1.e5
  initial_vel = 0.
  initial_T = 300.

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10

    A   = 9.6858407346e-01
    D_h = 6.1661977237e+00
    f = 0.01

    fp = eos
  []

  [hxconn]
    type = HeatTransferFromExternalAppTemperature1Phase
    flow_channel = pipe1
    Hw = 3000
    P_hf = 6.2831853072e-01
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 1
    T = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 1e5
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'
  dt = 0.5
  dtmin = 1e-7
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-4
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 300

  start_time = 0.0
  end_time = 5
[]

[Outputs]
  [out]
    type = Exodus
    show = 'T_wall'
  []
[]

(modules/thermal_hydraulics/test/tests/problems/area_constriction/area_constriction.i)

# This test features air flowing through a channel whose cross-sectional area
# shrinks to half its value in the right half. Assuming incompressible flow
# conditions, such as having a low Mach number, the velocity should approximately
# double from inlet to outlet.

p_outlet = 1e5

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 300
  initial_p = ${p_outlet}
  initial_vel = initial_vel_fn

  fp = fp
  closures = simple_closures
  f = 0

  scaling_factor_1phase = '1 1 1e-5'
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [A_fn]
    type = PiecewiseConstant
    axis = x
    direction = right
    x = '0.5 1.0'
    y = '1.0 0.5'
  []
  [initial_vel_fn]
    type = PiecewiseConstant
    axis = x
    direction = right
    x = '0.5 1.0'
    y = '1.0 2'
  []
[]

[Components]
  [inlet]
    type = InletDensityVelocity1Phase
    input = 'pipe:in'
    rho = 1.16263315948279 # rho @ (p = 1e5 Pa, T = 300 K)
    vel = 1
  []

  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 100

    A = A_fn
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = ${p_outlet}
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  end_time = 10
  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 0.001
    optimal_iterations = 5
    iteration_window = 1
    growth_factor = 1.2
  []

  steady_state_detection = true

  solve_type = PJFNK
  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-8
  nl_max_its = 15

  l_tol = 1e-3
  l_max_its = 10
[]

[Outputs]
  exodus = true
  velocity_as_vector = false
  show = 'A rho vel p'
[]

(modules/thermal_hydraulics/test/tests/components/volume_junction_1phase/phy.form_loss.i)

# This test measures the pressure drop across the volume junction with K=1.

A = 0.1

[GlobalParams]
  gravity_vector = '0 0 0'

  scaling_factor_1phase = '1 1 1e-5'
  scaling_factor_rhoV = 1
  scaling_factor_rhouV = 1
  scaling_factor_rhovV = 1
  scaling_factor_rhowV = 1
  scaling_factor_rhoEV = 1e-5

  initial_T = 300
  initial_p = 1e5
  initial_vel = 1

  n_elems = 20
  length = 1

  f = 0

  fp = fp
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    q = 0
    q_prime = 0
    p_inf = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [K_fn]
    type = TimeRampFunction
    initial_value = 0
    initial_time = 2
    ramp_duration = 5
    final_value = 1
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    A = ${A}
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '1 0 0'
    A = ${A}
    initial_p = 1e5
  []

  [junction]
    type = VolumeJunction1Phase
    connections = 'pipe1:out pipe2:in'

    position = '1 0 0'
    volume = 0.005
    initial_p = 1e5
    initial_vel_x = 1
    initial_vel_y = 0
    initial_vel_z = 0
    use_scalar_variables = false
  []

  [pipe1_in]
    type = InletVelocityTemperature1Phase
    input = 'pipe1:in'
    vel = 1
    T = 300
  []

  [pipe2_out]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[ControlLogic]
  active = ''
  [K_crtl]
    type = TimeFunctionComponentControl
    component = junction
    parameter = K
    function = K_fn
  []
[]

[Postprocessors]
  [pJ_in]
    type = SideAverageValue
    variable = p
    boundary = pipe1:out
  []

  [pJ_out]
    type = SideAverageValue
    variable = p
    boundary = pipe2:in
  []

  [dpJ]
    type = DifferencePostprocessor
    value1 = pJ_in
    value2 = pJ_out
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  end_time = 20
  dt = 0.5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  nl_rel_tol = 0
  nl_abs_tol = 1e-8
  nl_max_its = 15

  l_tol = 1e-3
  l_max_its = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'
[]

[Outputs]
  csv = true
  execute_on = 'final'
  show = 'dpJ'
[]

(modules/thermal_hydraulics/test/tests/components/junction_parallel_channels_1phase/jac.test.i)

# Pump data used in this test comes from the LOFT Systems Tests, described in NUREG/CR-0247

[GlobalParams]
  initial_p = 1e5
  initial_T = 300
  initial_vel = 1

  closures = simple_closures
  fp = fp
  f = 0

  scaling_factor_1phase = '1e-2 1e-2 1e-5'
  scaling_factor_rhoEV = 1e-5
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [in]
    type = InletStagnationPressureTemperature1Phase
    input = fch1:in
    p0 = 1.1e5
    T0 = 300
  []

  [fch1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 1
    A = 1
  []

  [junction]
    type = JunctionParallelChannels1Phase
    connections = 'fch1:out fch2:in'
    position = '1 0 0'
    volume = 0.3
    initial_vel_x = 1
    initial_vel_y = 0
    initial_vel_z = 0
    use_scalar_variables = false
  []

  [fch2]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 1
    A = 1.5
  []

  [out]
    type = Outlet1Phase
    input = fch2:out
    p = 1e5
  []
[]


[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  num_steps = 1
  abort_on_solve_fail = true
  dt = 0.1

  solve_type = 'newton'
  line_search = 'basic'
  petsc_options_iname = '-snes_test_err'
  petsc_options_value = '1e-9'

  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-6
  nl_max_its = 15

  l_tol = 1e-4
  l_max_its = 10
[]

(modules/thermal_hydraulics/test/tests/components/inlet_mass_flow_rate_1phase/clg.ctrl_T_3eqn_rdg.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0.0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 50

    A   = 1.0000000000e-04
    D_h = 1.1283791671e-02

    f = 0.0

    fp = fp
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.1
    T = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Functions]
  [inlet_T_fn]
    type = PiecewiseLinear
    x = '0   1'
    y = '300 350'
  []
[]

[ControlLogic]
  [set_inlet_value]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = T
    function = inlet_T_fn
  []
[]

[Postprocessors]
  [inlet_T]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = T
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0.0
  dt = 0.25
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'

  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-6
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/controls/set_real_value_control/test.i)

# This is testing that the values set by SetRealValueControl are used.
# The values of function T0_fn are set into an aux-field `aux`. Then,
# we compute the average value of this field in a postprocessor. It
# should be equal to the value of T0_fn.

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 15.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 100.e3
    T0 = 350.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[AuxVariables]
  [aux]
  []
[]

[AuxKernels]
  [aux_kernel]
    type = ConstantAux
    variable = aux
    value = 350
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Functions]
  [T0_fn]
    type = PiecewiseLinear
    x = '0 1'
    y = '350 345'
  []
[]

[ControlLogic]
  [T_inlet_fn]
    type = GetFunctionValueControl
    function = T0_fn
  []

  [set_inlet_value]
    type = SetRealValueControl
    parameter = AuxKernels/aux_kernel/value
    value = T_inlet_fn:value
  []
[]

[Postprocessors]
  [aux]
    type = ElementAverageValue
    variable = aux
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 0.1
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0.0
  end_time = 1

  automatic_scaling = true
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/outlet_1phase/jacobian.i)

[GlobalParams]
  initial_p = 1e5
  initial_T = 300
  initial_vel = 2

  gravity_vector = '9.81 0 0'

  scaling_factor_1phase = '1. 1. 1'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = eos
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A = 1e-4
    D_h = 1.12837916709551
    f = 0.1
    length = 1
    n_elems = 2
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  start_time = 0
  dt = 1e-2
  num_steps = 1
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-7
  nl_max_its = 5

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-snes_type -snes_test_err'
  petsc_options_value = 'test       1e-11'
[]

(modules/thermal_hydraulics/test/tests/controls/set_component_bool_value_control/test.i)

# This is testing that the values set by SetComponentBoolValueControl are used.
# The `trip_ctrl` component produces a boolean value that is set in the
# `turbine` component to switch it on/off.

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0

  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'fch1:in'
    p0 = 100.e3
    T0 = 350.
  []

  [fch1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [turbine]
    type = SimpleTurbine1Phase
    position = '1 0 0'
    connections = 'fch1:out fch2:in'
    volume = 1
    on = false
    power = 1
    use_scalar_variables = false
  []

  [fch2]
    type = FlowChannel1Phase
    fp = fp
    position = '1 0 0'
    orientation = '1 0 0'
    length = 1.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [outlet]
    type = Outlet1Phase
    input = 'fch2:out'
    p = 100.0e3
  []
[]

[Functions]
  [trip_fn]
    type = PiecewiseLinear
    xy_data = '
      0 1
      1 2'
  []
[]

[ControlLogic]
  [trip_ctrl]
    type = UnitTripControl
    condition = 'val > 1.5'
    symbol_names = 'val'
    symbol_values = 'trip_fn'
  []

  [set_comp_value]
    type = SetComponentBoolValueControl
    component = turbine
    parameter = on
    value = trip_ctrl:state
  []
[]

[Postprocessors]
  [on_ctrl]
    type = BoolComponentParameterValuePostprocessor
    component = turbine
    parameter = on
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 0.1
  abort_on_solve_fail = true

  solve_type = NEWTON
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-5
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0.0
  end_time = 1
[]

[Outputs]
  [out]
    type = CSV
    show = 'on_ctrl'
  []
[]

(modules/thermal_hydraulics/test/tests/problems/brayton_cycle/open_brayton_cycle.i)

# This input file is used to demonstrate a simple open-air Brayton cycle using
# a compressor, turbine, shaft, motor, and generator.
# The flow length is divided into 5 segments as illustrated below, where
#   - "(I)" denotes the inlet
#   - "(C)" denotes the compressor
#   - "(T)" denotes the turbine
#   - "(O)" denotes the outlet
#   - "*" denotes a fictitious junction
#
#                  Heated section
# (I)-----(C)-----*--------------*-----(T)-----(O)
#      1       2         3          4       5
#
# Initially the fluid is at rest at ambient conditions, the shaft speed is zero,
# and no heat transfer occurs with the system.
# The transient is controlled as follows:
#   * 0   - 100 s: motor ramps up torque linearly from zero
#   * 100 - 200 s: motor ramps down torque linearly to zero, HTC ramps up linearly from zero.
#   * 200 - 300 s: (no changes; should approach steady condition)

I_motor = 1.0
motor_torque_max = 400.0

I_generator = 1.0
generator_torque_per_shaft_speed = -0.00025

motor_ramp_up_duration = 100.0
motor_ramp_down_duration = 100.0
post_motor_time = 100.0
t1 = ${motor_ramp_up_duration}
t2 = ${fparse t1 + motor_ramp_down_duration}
t3 = ${fparse t2 + post_motor_time}

D1 = 0.15
D2 = ${D1}
D3 = ${D1}
D4 = ${D1}
D5 = ${D1}

A1 = ${fparse 0.25 * pi * D1^2}
A2 = ${fparse 0.25 * pi * D2^2}
A3 = ${fparse 0.25 * pi * D3^2}
A4 = ${fparse 0.25 * pi * D4^2}
A5 = ${fparse 0.25 * pi * D5^2}

L1 = 10.0
L2 = ${L1}
L3 = ${L1}
L4 = ${L1}
L5 = ${L1}

x1 = 0.0
x2 = ${fparse x1 + L1}
x3 = ${fparse x2 + L2}
x4 = ${fparse x3 + L3}
x5 = ${fparse x4 + L4}

x2_minus = ${fparse x2 - 0.001}
x2_plus = ${fparse x2 + 0.001}
x5_minus = ${fparse x5 - 0.001}
x5_plus = ${fparse x5 + 0.001}

n_elems1 = 10
n_elems2 = ${n_elems1}
n_elems3 = ${n_elems1}
n_elems4 = ${n_elems1}
n_elems5 = ${n_elems1}

A_ref_comp = ${fparse 0.5 * (A1 + A2)}
V_comp = ${fparse A_ref_comp * 1.0}
I_comp = 1.0

A_ref_turb = ${fparse 0.5 * (A4 + A5)}
V_turb = ${fparse A_ref_turb * 1.0}
I_turb = 1.0

c0_rated_comp = 351.6925137
rho0_rated_comp = 1.146881112

rated_mfr = 0.25

speed_rated_rpm = 96000
speed_rated = ${fparse speed_rated_rpm * 2 * pi / 60.0}

speed_initial = 0

eff_comp = 0.79
eff_turb = 0.843

T_hot = 1000
T_ambient = 300
p_ambient = 1e5

[GlobalParams]
  orientation = '1 0 0'
  gravity_vector = '0 0 0'

  initial_p = ${p_ambient}
  initial_T = ${T_ambient}
  initial_vel = 0
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0

  fp = fp_air
  closures = closures
  f = 0

  scaling_factor_1phase = '1 1 1e-5'
  scaling_factor_rhoV = 1
  scaling_factor_rhouV = 1
  scaling_factor_rhovV = 1
  scaling_factor_rhowV = 1
  scaling_factor_rhoEV = 1e-5

  rdg_slope_reconstruction = none
[]

[Functions]
  [motor_torque_fn]
    type = PiecewiseLinear
    x = '0 ${t1} ${t2}'
    y = '0 ${motor_torque_max} 0'
  []
  [motor_power_fn]
    type = ParsedFunction
    expression = 'torque * speed'
    symbol_names = 'torque speed'
    symbol_values = 'motor_torque shaft:omega'
  []
  [generator_torque_fn]
    type = ParsedFunction
    expression = 'slope * t'
    symbol_names = 'slope'
    symbol_values = '${generator_torque_per_shaft_speed}'
  []
  [generator_power_fn]
    type = ParsedFunction
    expression = 'torque * speed'
    symbol_names = 'torque speed'
    symbol_values = 'generator_torque shaft:omega'
  []
  [htc_wall_fn]
    type = PiecewiseLinear
    x = '0 ${t1} ${t2}'
    y = '0 0 1e3'
  []
[]

[FluidProperties]
  [fp_air]
    type = IdealGasFluidProperties
    emit_on_nan = none
  []
[]

[Closures]
  [closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [shaft]
    type = Shaft
    connected_components = 'motor compressor turbine generator'
    initial_speed = ${speed_initial}
  []
  [motor]
    type = ShaftConnectedMotor
    inertia = ${I_motor}
    torque = 0 # controlled
  []
  [generator]
    type = ShaftConnectedMotor
    inertia = ${I_generator}
    torque = generator_torque_fn
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = ${p_ambient}
    T0 = ${T_ambient}
  []
  [pipe1]
    type = FlowChannel1Phase
    position = '${x1} 0 0'
    length = ${L1}
    n_elems = ${n_elems1}
    A = ${A1}
  []
  [compressor]
    type = ShaftConnectedCompressor1Phase
    position = '${x2} 0 0'
    inlet = 'pipe1:out'
    outlet = 'pipe2:in'
    A_ref = ${A_ref_comp}
    volume = ${V_comp}

    omega_rated = ${speed_rated}
    mdot_rated = ${rated_mfr}
    c0_rated = ${c0_rated_comp}
    rho0_rated = ${rho0_rated_comp}

    speeds = '0.5208 0.6250 0.7292 0.8333 0.9375'
    Rp_functions = 'rp_comp1 rp_comp2 rp_comp3 rp_comp4 rp_comp5'
    eff_functions = 'eff_comp1 eff_comp2 eff_comp3 eff_comp4 eff_comp5'

    min_pressure_ratio = 1.0

    speed_cr_I = 0
    inertia_const = ${I_comp}
    inertia_coeff = '${I_comp} 0 0 0'

    # assume no shaft friction
    speed_cr_fr = 0
    tau_fr_const = 0
    tau_fr_coeff = '0 0 0 0'

    use_scalar_variables = false
  []
  [pipe2]
    type = FlowChannel1Phase
    position = '${x2} 0 0'
    length = ${L2}
    n_elems = ${n_elems2}
    A = ${A2}
  []
  [junction2_3]
    type = JunctionOneToOne1Phase
    connections = 'pipe2:out pipe3:in'
  []
  [pipe3]
    type = FlowChannel1Phase
    position = '${x3} 0 0'
    length = ${L3}
    n_elems = ${n_elems3}
    A = ${A3}
  []
  [junction3_4]
    type = JunctionOneToOne1Phase
    connections = 'pipe3:out pipe4:in'
  []
  [pipe4]
    type = FlowChannel1Phase
    position = '${x4} 0 0'
    length = ${L4}
    n_elems = ${n_elems4}
    A = ${A4}
  []
  [turbine]
    type = ShaftConnectedCompressor1Phase
    position = '${x5} 0 0'
    inlet = 'pipe4:out'
    outlet = 'pipe5:in'
    A_ref = ${A_ref_turb}
    volume = ${V_turb}

    treat_as_turbine = true

    omega_rated = ${speed_rated}
    mdot_rated = ${rated_mfr}
    c0_rated = ${c0_rated_comp}
    rho0_rated = ${rho0_rated_comp}

    speeds = '0 0.5208 0.6250 0.7292 0.8333 0.9375'
    Rp_functions = 'rp_turb0 rp_turb1 rp_turb2 rp_turb3 rp_turb4 rp_turb5'
    eff_functions = 'eff_turb1 eff_turb1 eff_turb2 eff_turb3 eff_turb4 eff_turb5'

    min_pressure_ratio = 1.0

    speed_cr_I = 0
    inertia_const = ${I_turb}
    inertia_coeff = '${I_turb} 0 0 0'

    # assume no shaft friction
    speed_cr_fr = 0
    tau_fr_const = 0
    tau_fr_coeff = '0 0 0 0'

    use_scalar_variables = false
  []
  [pipe5]
    type = FlowChannel1Phase
    position = '${x5} 0 0'
    length = ${L5}
    n_elems = ${n_elems5}
    A = ${A5}
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe5:out'
    p = ${p_ambient}
  []

  [heating]
    type = HeatTransferFromSpecifiedTemperature1Phase
    flow_channel = pipe3
    T_wall = ${T_hot}
    Hw = htc_wall_fn
  []
[]

[ControlLogic]
  [motor_ctrl]
    type = TimeFunctionComponentControl
    component = motor
    parameter = torque
    function = motor_torque_fn
  []
[]

[Postprocessors]
  [heating_rate]
    type = ADHeatRateConvection1Phase
    block = 'pipe3'
    T = T
    T_wall = T_wall
    Hw = Hw
    P_hf = P_hf
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [motor_torque]
    type = RealComponentParameterValuePostprocessor
    component = motor
    parameter = torque
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [motor_power]
    type = FunctionValuePostprocessor
    function = motor_power_fn
    execute_on = 'INITIAL TIMESTEP_END'
    indirect_dependencies = 'motor_torque shaft:omega'
  []

  [generator_torque]
    type = ShaftConnectedComponentPostprocessor
    quantity = torque
    shaft_connected_component_uo = generator:shaftconnected_uo
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [generator_power]
    type = FunctionValuePostprocessor
    function = generator_power_fn
    execute_on = 'INITIAL TIMESTEP_END'
    indirect_dependencies = 'generator_torque shaft:omega'
  []

  [shaft_speed]
    type = ScalarVariable
    variable = 'shaft:omega'
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [p_in_comp]
    type = PointValue
    variable = p
    point = '${x2_minus} 0 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_out_comp]
    type = PointValue
    variable = p
    point = '${x2_plus} 0 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_ratio_comp]
    type = ParsedPostprocessor
    pp_names = 'p_in_comp p_out_comp'
    expression = 'p_out_comp / p_in_comp'
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [p_in_turb]
    type = PointValue
    variable = p
    point = '${x5_minus} 0 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_out_turb]
    type = PointValue
    variable = p
    point = '${x5_plus} 0 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_ratio_turb]
    type = ParsedPostprocessor
    pp_names = 'p_in_turb p_out_turb'
    expression = 'p_in_turb / p_out_turb'
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [mfr_comp]
    type = ADFlowJunctionFlux1Phase
    boundary = pipe1:out
    connection_index = 0
    equation = mass
    junction = compressor
  []
  [mfr_turb]
    type = ADFlowJunctionFlux1Phase
    boundary = pipe4:out
    connection_index = 0
    equation = mass
    junction = turbine
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  end_time = ${t3}
  dt = 0.1
  abort_on_solve_fail = true

  solve_type = NEWTON
  nl_rel_tol = 1e-50
  nl_abs_tol = 1e-11
  nl_max_its = 15

  l_tol = 1e-4
  l_max_its = 10
[]

[Outputs]
  [csv]
    type = CSV
    file_base = 'open_brayton_cycle'
    execute_vector_postprocessors_on = 'INITIAL'
  []
  [console]
    type = Console
    show = 'shaft_speed p_ratio_comp p_ratio_turb compressor:pressure_ratio turbine:pressure_ratio'
  []
[]

[Functions]
  # compressor pressure ratio
  [rp_comp1]
    type = PiecewiseLinear
    data_file = 'rp_comp1.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_comp2]
    type = PiecewiseLinear
    data_file = 'rp_comp2.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_comp3]
    type = PiecewiseLinear
    data_file = 'rp_comp3.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_comp4]
    type = PiecewiseLinear
    data_file = 'rp_comp4.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_comp5]
    type = PiecewiseLinear
    data_file = 'rp_comp5.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []

  # compressor efficiency
  [eff_comp1]
    type = ConstantFunction
    value = ${eff_comp}
  []
  [eff_comp2]
    type = ConstantFunction
    value = ${eff_comp}
  []
  [eff_comp3]
    type = ConstantFunction
    value = ${eff_comp}
  []
  [eff_comp4]
    type = ConstantFunction
    value = ${eff_comp}
  []
  [eff_comp5]
    type = ConstantFunction
    value = ${eff_comp}
  []

  # turbine pressure ratio
  [rp_turb0]
    type = ConstantFunction
    value = 1
  []
  [rp_turb1]
    type = PiecewiseLinear
    data_file = 'rp_turb1.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_turb2]
    type = PiecewiseLinear
    data_file = 'rp_turb2.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_turb3]
    type = PiecewiseLinear
    data_file = 'rp_turb3.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_turb4]
    type = PiecewiseLinear
    data_file = 'rp_turb4.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_turb5]
    type = PiecewiseLinear
    data_file = 'rp_turb5.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []

  # turbine efficiency
  [eff_turb1]
    type = ConstantFunction
    value = ${eff_turb}
  []
  [eff_turb2]
    type = ConstantFunction
    value = ${eff_turb}
  []
  [eff_turb3]
    type = ConstantFunction
    value = ${eff_turb}
  []
  [eff_turb4]
    type = ConstantFunction
    value = ${eff_turb}
  []
  [eff_turb5]
    type = ConstantFunction
    value = ${eff_turb}
  []
[]

(modules/thermal_hydraulics/test/tests/problems/area_constriction/area_constriction_junction.i)

# This test features air flowing through a channel whose cross-sectional area
# shrinks to half its value in the right half. Assuming incompressible flow
# conditions, such as having a low Mach number, the velocity should approximately
# double from inlet to outlet. In this version of the test, the area discontinuity
# is achieved by connecting two flow channels with a junction.

p_outlet = 1e5

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 300
  initial_p = ${p_outlet}

  fp = fp
  closures = simple_closures
  f = 0

  scaling_factor_1phase = '1 1 1e-5'
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletDensityVelocity1Phase
    input = 'pipe1:in'
    rho = 1.16263315948279 # rho @ (p = 1e5 Pa, T = 300 K)
    vel = 1
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 50

    A = 1
    initial_vel = 1
  []

  [junction]
    type = JunctionOneToOne1Phase
    connections = 'pipe1:out pipe2:in'
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '0.5 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 50

    A = 0.5
    initial_vel = 2
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = ${p_outlet}
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  end_time = 10
  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 0.001
    optimal_iterations = 5
    iteration_window = 1
    growth_factor = 1.2
  []

  steady_state_detection = true

  solve_type = PJFNK
  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-8
  nl_max_its = 15

  l_tol = 1e-3
  l_max_its = 10
[]

[Outputs]
  exodus = true
  velocity_as_vector = false
  show = 'A rho vel p'
[]

(modules/thermal_hydraulics/test/tests/controls/get_function_value_control/test.i)

# This is testing that the values obtained by GetFunctionValueControl are used.
# Function T0_fn prescribes values for T_inlet_fn control. We output the function
# values via a postprocessor `T_fn` and the control data values via another
# postprocessor `T_ctrl`. Those two values have to be equal.

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 15.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 100.e3
    T0 = 350.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[Functions]
  [T0_fn]
    type = PiecewiseLinear
    x = '0 1'
    y = '350 345'
  []
[]

[ControlLogic]
  [T_inlet_fn]
    type = GetFunctionValueControl
    function = T0_fn
  []
[]

[Postprocessors]
  [T_fn]
    type = FunctionValuePostprocessor
    function = T0_fn
  []

  [T_ctrl]
    type = RealControlDataValuePostprocessor
    control_data_name = T_inlet_fn:value
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 0.1
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0.0
  end_time = 1
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/controls/dependency/test.i)

# This is testing that controls are executed in the correct order
#
# If controls are executed in the right order, then T_inlet_ctrl
# reads the value of temperature (T = 345 K) from a function. Then
# this value is set into the BC and then is it sampled by a
# postprocessor whose value is then written into a CSV file.
#
# If controls were executed in the wrong order, we would sample the
# stagnation temperature function at time t = 0, which would give
# T = 360 K back, and we would see this value in the CSV file instead.

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 15.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 100.e3
    T0 = 355.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[Functions]
  # Stagnation temperature in time
  [T0_fn]
    type = PiecewiseLinear
    x = '0   1e-5'
    y = '360 345'
  []
[]

[ControlLogic]
  [set_inlet_value_ctrl]
    type = SetComponentRealValueControl
    component = inlet
    parameter = T0
    value = T_inlet_ctrl:value
  []

  [T_inlet_ctrl]
    type = GetFunctionValueControl
    function = T0_fn
  []
[]

[Postprocessors]
  [T_ctrl]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = T0
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  start_time = 0
  dt = 1e-5
  num_steps = 1
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/simple_turbine_1phase/phy.conservation.i)

[GlobalParams]
  initial_p = 1e6
  initial_T = 517
  initial_vel = 4.3
  initial_vel_x = 4.3
  initial_vel_y = 0
  initial_vel_z = 0

  fp = fp

  closures = simple_closures
  f = 0

  rdg_slope_reconstruction = minmod
  gravity_vector = '0 0 0'

  scaling_factor_1phase = '1 1 1e-5'
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
    molar_mass = 0.01
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 10
    T = 517
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 1
  []

  [turbine]
    type = SimpleTurbine1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1 0 0'
    volume = 1
    A_ref = 1.0
    K = 0
    on = true
    power = 1000
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1. 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 1
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e6
  []
[]

[Postprocessors]
  [mass_in]
    type = ADFlowBoundaryFlux1Phase
    equation = mass
    boundary = inlet
  []
  [mass_out]
    type = ADFlowBoundaryFlux1Phase
    equation = mass
    boundary = outlet
  []
  [mass_diff]
    type = LinearCombinationPostprocessor
    pp_coefs = '1 -1'
    pp_names = 'mass_in mass_out'
  []
  [p_in]
    type = SideAverageValue
    boundary = pipe1:in
    variable = p
  []
  [vel_in]
    type = SideAverageValue
    boundary = pipe1:in
    variable = vel_x
  []
  [momentum_in]
    type = ADFlowBoundaryFlux1Phase
    equation = momentum
    boundary = inlet
  []
  [momentum_out]
    type = ADFlowBoundaryFlux1Phase
    equation = momentum
    boundary = outlet
  []
  [dP]
    type = ParsedPostprocessor
    pp_names = 'p_in W_dot'
    expression = 'p_in * (1 - (1-W_dot/(10*2910.06*517))^(1.4/0.4))'
  []
  [momentum_diff]
    type = LinearCombinationPostprocessor
    pp_coefs = '1 -1 -1'
    pp_names = 'momentum_in momentum_out dP' # momentum source = -dP * A and A=1
  []

  [energy_in]
    type = ADFlowBoundaryFlux1Phase
    equation = energy
    boundary = inlet
  []
  [energy_out]
    type = ADFlowBoundaryFlux1Phase
    equation = energy
    boundary = outlet
  []
  [W_dot]
    type = ElementAverageValue
    variable = W_dot
    block = 'turbine'
  []
  [energy_diff]
    type = LinearCombinationPostprocessor
    pp_coefs = '1 -1 -1'
    pp_names = 'energy_in energy_out W_dot'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2

  start_time = 0
  end_time = 10
  dt = 0.5

  abort_on_solve_fail = true

  solve_type = 'newton'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'

  nl_rel_tol = 0
  nl_abs_tol = 2e-6

  nl_max_its = 10
  l_tol = 1e-3

  # automatic_scaling = true
  # compute_scaling_once = false
  # off_diagonals_in_auto_scaling = true
[]

[Outputs]
  [csv]
    type = CSV
    show = 'mass_diff energy_diff momentum_diff'
    execute_on = 'final'
  []
[]

(modules/thermal_hydraulics/test/tests/output/vector_velocity/test.i)

[GlobalParams]
  initial_vel = 0
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0
  initial_p = 1e5
  initial_T = 300

  f = 0.1
  closures = simple_closures
  fp = fp
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'fch1:in'
    m_dot = 1
    T = 300
  []

  [fch1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 1 1'
    length = 1.73205
    n_elems = 5
    A = 1
  []

  [junction]
    type = VolumeJunction1Phase
    position = '1 1 1'
    connections = 'fch1:out fch2:out'
    volume = 0.1
    use_scalar_variables = false
  []

  [fch2]
    type = FlowChannel1Phase
    position = '2 2 2'
    orientation = '-1 -1 -1'
    length = 1.73205
    n_elems = 5
    A = 2
  []

  [outlet]
    type = Outlet1Phase
    input = 'fch2:in'
    p = 1e5
  []
[]

[Executioner]
  type = Transient
  dt = 0.5
  num_steps = 50

  solve_type = NEWTON
  line_search = basic
  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  nl_abs_tol = 1e-6
  l_tol = 1e-03

  automatic_scaling = true
[]

[Outputs]
  print_linear_converged_reason = false
  print_nonlinear_converged_reason = false
  print_linear_residuals = false

  [out]
    type = Exodus
    sync_only = false
    sync_times = '0 5 10 15 20 25'
    show = 'vel_x vel_y vel_z'
  []
[]

(modules/thermal_hydraulics/test/tests/misc/coupling_mD_flow/thm_non_overlapping.i)

T_in = 523.0
mdot = 10
pout = 7e6

[GlobalParams]
  initial_p = ${pout}
  initial_vel = 1
  initial_T = ${T_in}
  gravity_vector = '0 0 0'
  closures = simple_closures
  n_elems = 5

  scaling_factor_1phase = '1 1e-2 1e-5'
  f = 1
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.66
    molar_mass = 0.004
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet_bc]
    type = InletMassFlowRateTemperature1Phase
    input = 'inlet:in'
    m_dot = ${mdot}
    T = ${T_in}
  []

  [inlet]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 11'
    orientation = '0 0 -1'
    length = 1
    A = 1
  []

  [inlet_plenum]
    type = VolumeJunction1Phase
    position = '0 0 10'
    initial_vel_x = 0
    initial_vel_y = 0
    initial_vel_z = 1
    connections = 'inlet:out bypass:in core_top:in'
    volume = 1
    use_scalar_variables = false
  []

  [bypass]
    type = FlowChannel1Phase
    fp = fp
    position = '2 0 10'
    orientation = '0 0 -1'
    length = 10
    A = 0.01
  []

  [core_top]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 10'
    orientation = '0 0 -1'
    length = 0.1
    A = 9
  []

  [core_top_bc]
    type = Outlet1Phase
    p = ${pout}
    input = 'core_top:out'
  []

  [core_bottom_bc]
    type = InletMassFlowRateTemperature1Phase
    input = 'core_bottom:in'
    m_dot = ${mdot}
    T = ${T_in}
  []

  [core_bottom]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0.1'
    orientation = '0 0 -1'
    length = 0.1
    A = 9
  []

  [outlet_plenum]
    type = VolumeJunction1Phase
    position = '0 0 0'
    initial_vel_x = 1
    initial_vel_y = 0
    initial_vel_z = 1
    connections = 'bypass:out core_bottom:out outlet:in'
    volume = 1
    use_scalar_variables = false
  []

  [outlet]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '0 0 -1'
    length = 1
    A = 1
  []

  [outlet_bc]
    type = Outlet1Phase
    p = ${pout}
    input = 'outlet:out'
  []
[]

[ControlLogic]
  [set_core_inlet_pressure]
    type = SetComponentRealValueControl
    component = core_top_bc
    parameter = p
    value = core_inlet_pressure
  []

  [set_core_outlet_mdot]
    type = SetComponentRealValueControl
    component = core_bottom_bc
    parameter = m_dot
    value = core_outlet_mdot
  []

  [set_core_outlet_temperature]
    type = SetComponentRealValueControl
    component = core_bottom_bc
    parameter = T
    value = core_outlet_temperature
  []
[]

[Postprocessors]
  [core_inlet_pressure]
    type = Receiver
    default = ${pout}
  []

  [core_outlet_mdot]
    type = Receiver
    default = ${mdot}
  []

  [core_outlet_temperature]
    type = Receiver
    default = ${T_in}
  []

  [core_outlet_pressure]
    type = SideAverageValue
    variable = p
    boundary = 'core_bottom:in'
    execute_on = 'INITIAL LINEAR TIMESTEP_END'
  []

  [core_inlet_mdot]
    type = SideAverageValue
    variable = rhouA
    boundary = 'core_top:out'
    execute_on = 'INITIAL LINEAR TIMESTEP_END'
  []

  [core_inlet_temperature]
    type = SideAverageValue
    variable = T
    boundary = 'core_top:out'
    execute_on = 'INITIAL LINEAR TIMESTEP_END'
  []

  [bypass_inlet_pressure]
    type = SideAverageValue
    variable = p
    boundary = 'bypass:in'
  []

  [bypass_outlet_pressure]
    type = SideAverageValue
    variable = p
    boundary = 'bypass:out'
  []

  [bypass_pressure_drop]
    type = DifferencePostprocessor
    value1 = bypass_inlet_pressure
    value2 = bypass_outlet_pressure
  []

  [bypass_mdot]
    type = SideAverageValue
    variable = rhouA
    boundary = 'bypass:out'
    execute_on = 'INITIAL LINEAR TIMESTEP_END'
  []

  [inlet_mdot]
    type = SideAverageValue
    variable = rhouA
    boundary = 'inlet:in'
    execute_on = 'INITIAL LINEAR TIMESTEP_END'
  []

  [outlet_mdot]
    type = SideAverageValue
    variable = rhouA
    boundary = 'outlet:out'
    execute_on = 'INITIAL LINEAR TIMESTEP_END'
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  timestep_tolerance = 1e-6
  start_time = 0
  end_time = 100
  dt = 0.01
  line_search = l2
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-4
  nl_max_its = 25
  l_tol = 1e-3
  l_max_its = 20
  petsc_options = '-snes_converged_reason'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu     '
[]

[Outputs]
  exodus = true
[]

(modules/thermal_hydraulics/test/tests/misc/initial_from_file/heat_transfer_from_heat_structure/steady_state.i)

[GlobalParams]
  scaling_factor_1phase = '1. 1.e-2 1.e-4'
  scaling_factor_temperature = 1e-2

  initial_T = 500
  initial_p = 6.e6
  initial_vel = 0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[SolidProperties]
  [mat1]
    type = ThermalFunctionSolidProperties
    k = 16
    cp = 356.
    rho = 6.551400E+03
  []
[]

[Functions]
  [Ts_init]
    type = ParsedFunction
    expression = '2*sin(x*pi)+507'
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 3
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [hs]
    type = HeatStructureCylindrical
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 3
    names = 'wall'
    n_part_elems = 1
    solid_properties = 'mat1'
    solid_properties_T_ref = '300'
    inner_radius = 0.01
    widths = 0.1
    initial_T = Ts_init
  []

  [ht]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = pipe
    hs = hs
    hs_side = INNER
    Hw = 10000
  []

  [temp_outside]
    type = HSBoundarySpecifiedTemperature
    hs = hs
    boundary = hs:outer
    T = Ts_init
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.1
    T = 500
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 6e6
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 1
  num_steps = 100
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
[]

[Outputs]
  exodus = true
  execute_on = 'initial final'
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/closures/simple_1phase/err.missing_f_1phase.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_vel = 0
  initial_p = 1e5
  initial_T = 300

  closures = simple_closures
[]

[FluidProperties]
  [water]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = water
    position = '0 0 0'
    orientation = '1 0 0'
    A = 1.
    length = 1
    n_elems = 10
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 10
    T0 = 10
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 10
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 1e-4
  dtmin = 1.e-7

  solve_type = 'PJFNK'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-8
  l_max_its = 100

  start_time = 0.0
  num_steps = 10

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

(modules/thermal_hydraulics/test/tests/components/form_loss_from_function_1phase/phy.form_loss_1phase.i)

# Tests the form loss kernel for 1-phase flow.
#
# This test uses the following parameters and boundary data:
# Inlet: (rho = 996.5563397 kg/m^3, vel = 0.5 m/s)
# Outlet: p_out = 100 kPa
# Length: L = 2 m
# Form loss coefficient: K = 0.5, => K_prime = 0.25 m^-1 (uniform along length)
#
# The inlet pressure is
#
#   p_in = p_out + dp ,
#
# where dp is given by the definition of the form loss coefficient:
#
#   dp = K * 0.5 * rho * u^2
#      = 0.5 * 0.5 * 996.5563397 * 0.5^2
#      = 62.28477123125 Pa
#
# This value is output to CSV.

p_out = 100e3

[GlobalParams]
  initial_p = ${p_out}
  initial_vel = 0.5
  initial_T = 300.0

  gravity_vector = '0 0 0'

  scaling_factor_1phase = '1 1 1e-4'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 2
    A = 1
    n_elems = 5

    f = 0
  []
  [form_loss]
    type = FormLossFromFunction1Phase
    flow_channel = pipe
    K_prime = 0.25
  []
  [inlet]
    type = InletDensityVelocity1Phase
    input = 'pipe:in'
    rho = 996.5563397
    vel = 0.5
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = ${p_out}
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2
  dt = 0.1
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-8
  nl_abs_tol = 5e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 20

  start_time = 0.0
  num_steps = 100

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Postprocessors]
  # this is not the right value, should be the value from the inlet ghost cell
  [p_in]
    type = SideAverageValue
    boundary = inlet
    variable = p
    execute_on = TIMESTEP_END
  []
  [p_out]
    type = FunctionValuePostprocessor
    function = ${p_out}
    execute_on = TIMESTEP_END
  []
  [dp]
    type = DifferencePostprocessor
     value1 = p_in
     value2 = p_out
     execute_on = TIMESTEP_END
  []
[]

[Outputs]
  [out]
    type = CSV
    show = 'dp'
    execute_postprocessors_on = final
  []
[]

(modules/thermal_hydraulics/test/tests/components/gate_valve_1phase/gate_valve_1phase.i)

# This input file is used to test the gate valve component.

# This problem consists of a T junction of 3 pipes. The inlet pipe is one of the
# 2 pipes of the "top" of the T. The other 2 pipes each have a gate valve.
# Initially, one of the 2 outlet pipes has an open valve and the other has a
# closed valve. Later in the transient, the valves gradually open/close to switch
# the outlet flow direction.

p = 1.0e5
T = 300.0
rho = 1.161430436 # @ 1e5 Pa, 300 K

D = 0.1
A = ${fparse pi * D^2 / 4.0}
V_junction = ${fparse pi * D^3 / 4.0}

vel_in = 2.0
m_dot = ${fparse rho * vel_in * A}

t_begin = 0.3
delta_t_open = 0.1

[GlobalParams]
  gravity_vector = '0 0 0'

  closures = simple_closures
  fp = fp

  f = 0.0

  initial_T = ${T}
  initial_p = ${p}
  initial_vel = 0
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
    molar_mass = 0.02897
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [pipe3_open_fn]
    type = TimeRampFunction
    initial_value = 1
    final_value = 0
    initial_time = ${t_begin}
    ramp_duration = ${delta_t_open}
  []
  [pipe2_open_fn]
    type = ParsedFunction
    expression = '1 - pipe3_phi'
    symbol_names = 'pipe3_phi'
    symbol_values = 'pipe3_open_fn'
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = ${m_dot}
    T = ${T}
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1.0
    n_elems = 50
    A = ${A}
  []

  [volume_junction]
    type = VolumeJunction1Phase
    position = '1 0 0'
    connections = 'pipe1:out pipe2A:in pipe3A:in'
    volume = ${V_junction}
    initial_vel_x = 0
    initial_vel_y = 0
    initial_vel_z = 0
    use_scalar_variables = false
  []

  [pipe2A]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '0 1 0'
    length = 0.5
    n_elems = 25
    A = ${A}
  []

  [pipe2_valve]
    type = GateValve1Phase
    connections = 'pipe2A:out pipe2B:in'
    open_area_fraction = 0 # (controlled via 'pipe2_valve_control')
  []

  [pipe2B]
    type = FlowChannel1Phase
    position = '1 0.5 0'
    orientation = '0 1 0'
    length = 0.5
    n_elems = 25
    A = ${A}
  []

  [pipe2_outlet]
    type = Outlet1Phase
    input = 'pipe2B:out'
    p = ${p}
  []

  [pipe3A]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 25
    A = ${A}
  []

  [pipe3_valve]
    type = GateValve1Phase
    connections = 'pipe3A:out pipe3B:in'
    open_area_fraction = 0 # (controlled via 'pipe3_valve_control')
  []

  [pipe3B]
    type = FlowChannel1Phase
    position = '1.5 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 25
    A = ${A}
  []

  [pipe3_outlet]
    type = Outlet1Phase
    input = 'pipe3B:out'
    p = ${p}
  []
[]

[ControlLogic]
  [pipe2_valve_control]
    type = TimeFunctionComponentControl
    component = pipe2_valve
    parameter = open_area_fraction
    function = pipe2_open_fn
  []
  [pipe3_valve_control]
    type = TimeFunctionComponentControl
    component = pipe3_valve
    parameter = open_area_fraction
    function = pipe3_open_fn
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2

  solve_type = PJFNK
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 20

  l_tol = 1e-4

  start_time = 0.0
  end_time = 1.0
  dt = 0.01
  abort_on_solve_fail = true
[]

[Outputs]
  exodus = true
  show = 'p T vel'
  velocity_as_vector = false
  print_linear_residuals = false
  [console]
    type = Console
    max_rows = 1
  []
[]

(modules/thermal_hydraulics/test/tests/misc/initial_from_file/volume_junction/base.i)

[GlobalParams]
  scaling_factor_1phase = '1. 1.e-2 1.e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 3
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [junction]
    type = VolumeJunction1Phase
    connections = 'pipe1:out pipe2:in'
    volume = 1
    position = '1 0 0'

    scaling_factor_rhoV  = 1
    scaling_factor_rhouV = 1
    scaling_factor_rhovV = 1
    scaling_factor_rhowV = 1
    scaling_factor_rhoEV = 1e-4

    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '1 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 3
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 0.1
    T = 500
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 6e6
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 1
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  nl_rel_tol = 0
  nl_abs_tol = 1e-10
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'
[]

[Outputs]
  exodus = true
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/actions/coupled_heat_transfer_action/sub.i)

# This is a part of T_wall_action test. See the master file for details.

[GlobalParams]
  initial_p = 1.e5
  initial_vel = 0.
  initial_T = 300.

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[AuxVariables]
  [Hw]
    family = monomial
    order = constant
    block = pipe1
  []
[]

[AuxKernels]
  [Hw_ak]
    type = ADMaterialRealAux
    variable = Hw
    property = 'Hw'
  []
[]

[UserObjects]
  [T_uo]
    type = LayeredAverage
    direction = y
    variable = T
    num_layers = 10
    block = pipe1
  []
  [Hw_uo]
    type = LayeredAverage
    direction = y
    variable = Hw
    num_layers = 10
    block = pipe1
  []
[]


[Components]
  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 1 0'
    length = 1
    n_elems = 10

    A   = 1.28584e-01
    D_h = 8.18592e-01
    f = 0.01

    fp = eos
  []

  [hxconn]
    type = HeatTransferFromExternalAppTemperature1Phase
    flow_channel = pipe1
    Hw = 10000
    P_hf = 6.28319e-01
    initial_T_wall = 300.
    var_type = elemental
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 10
    T = 400
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Postprocessors]
  [T_wall_avg]
    type = ElementAverageValue
    variable = T_wall
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [htc_avg]
    type = ElementAverageValue
    variable = Hw
    execute_on = 'INITIAL TIMESTEP_END'
  []

  [T_avg]
    type = ElementAverageValue
    variable = T
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'
  dt = 0.1
  dtmin = 1e-7
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-4
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 300

  start_time = 0.0

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
[]

[Outputs]
  [out]
    type = Exodus
    show = 'T_wall T Hw'
  []
[]

(modules/thermal_hydraulics/test/tests/postprocessors/specific_impulse_1phase/Isp_1ph.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 6e6
  initial_T = 600
  initial_vel = 0

  scaling_factor_1phase = '1 1 1e-5'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = IdealGasFluidProperties
    gamma = 1.3066
    molar_mass = 2.016e-3
    k = 0.437
    mu = 3e-5
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = eos

    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10

    A = 0.1

    f = 0.
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    m_dot = 0.1
    T = 800
    input = 'pipe1:in'
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 6e6
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 0.01
    growth_factor = 1.4
    optimal_iterations = 6
    iteration_window = 2
  []
  start_time = 0.0
  end_time = 100
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'
[]

[Postprocessors]
  # hand calcs show that Isp should start at 274.3 at 600 K
  # and rise to 316.7 at 800 K.
  [Isp]
    type = ADSpecificImpulse1Phase
    p_exit = 1e6
    fp = eos
    boundary = outlet
  []

  [Isp_inst]
    type = ADSpecificImpulse1Phase
    p_exit = 1e6
    fp = eos
    cumulative = false
    boundary = outlet
  []

  [outletT]
    type = SideAverageValue
    variable = T
    boundary = pipe1:out
  []
[]

[Outputs]
  [out]
    type = CSV
    show = 'Isp Isp_inst'
    execute_on = 'INITIAL FINAL'
  []
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_heat_structure_1phase/err.1phase.i)

[GlobalParams]
  initial_p = 1e5
  initial_vel = 0
  initial_T = 300

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[SolidProperties]
  [fuel-mat]
    type = ThermalFunctionSolidProperties
    k = 2.5
    cp = 300.
    rho = 1.032e4
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0.1 0'
    orientation = '0 0 1'
    length = 4
    n_elems = 2

    A = 8.78882e-5
    D_h = 0.01179
    f = 0.01

    fp = fp
  []

  [hs]
    type = HeatStructureCylindrical
    position = '0 0 0'
    orientation = '0 0 1'
    length = 4
    n_elems = 2

    names = 'fuel'
    widths = '0.1'
    n_part_elems = '1'
    solid_properties = 'fuel-mat'
    solid_properties_T_ref = '300'

    initial_T = 300
  []

  [hx]
    type = HeatTransferFromHeatStructure1Phase
    hs = hs
    hs_side = outer
    flow_channel = pipe
    P_hf = 0.029832559676
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 1e5
    T0 = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 1.e-5
  solve_type = 'NEWTON'
  num_steps = 1
  abort_on_solve_fail = true
[]

(modules/thermal_hydraulics/test/tests/misc/initial_from_file/heat_transfer_from_heat_structure_3d/steady_state.i)

[GlobalParams]
  scaling_factor_1phase = '1. 1.e-2 1.e-4'
  scaling_factor_temperature = 1e-2

  initial_T = 500
  initial_p = 6.e6
  initial_vel = 0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Materials]
  [mat]
    type = ADGenericConstantMaterial
    prop_names = 'density specific_heat thermal_conductivity'
    prop_values = '16 356 6.5514e3'
  []
[]

[Functions]
  [Ts_init]
    type = ParsedFunction
    expression = '2*sin(x*pi/2)+2*sin(pi*y) +507'
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '-1 0 -2.5'
    orientation = '1 0 0'
    length = 2
    n_elems = 2
    A = 0.3
    D_h = 0.1935483871
    f = 0.1
  []
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.1
    T = 500
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 6e6
  []
  [ht]
    type = HeatTransferFromHeatStructure3D1Phase
    flow_channels = 'pipe'
    hs = blk
    boundary = blk:right
    P_hf = 3
    Hw = 1000
  []
  [blk]
    type = HeatStructureFromFile3D
    file = box.e
    position = '0 0 0'
    initial_T = Ts_init
  []
  [right_bnd]
    type = HSBoundarySpecifiedTemperature
    hs = blk
    boundary = blk:bottom
    T = Ts_init
  []
[]

[Executioner]
  type = Transient
  dt = 1
  num_steps = 100
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
[]

[Outputs]
  exodus = true
  execute_on = 'initial final'
[]

(modules/thermal_hydraulics/test/tests/misc/initial_from_file/flow_channel/steady_state.i)

[GlobalParams]
  scaling_factor_1phase = '1. 1.e-2 1.e-4'

  initial_T = 500
  initial_p = 6.e6
  initial_vel = 0

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 3
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.1
    T = 500
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 6e6
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 1
  num_steps = 100
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100
[]

[Outputs]
  exodus = true
  execute_on = 'initial final'
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/components/shaft_connected_turbine_1phase/turbine_startup.i)

# This test tests that the turbine can startup from rest and reach full power.
# The mass flow rate for the inlet component is ramped up over 10s. The dyno
# component and pid_ctrl controler are used to maintain the turbine's rated shaft
# speed. The turbine should supply ~1e6 W of power to the shaft by the end of the test.

omega_rated = 450
mdot = 5.0
T_in = 1000.0
p_out = 1e6

[GlobalParams]
  f = 1
  scaling_factor_1phase = '0.04 0.04 0.04e-5'
  closures = simple_closures
  n_elems = 20
  initial_T = ${T_in}
  initial_p = ${p_out}
  initial_vel = 0
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0
[]

[FluidProperties]
  [eos]
    type = IdealGasFluidProperties
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [ch_in]
    type = FlowChannel1Phase
    position = '-1 0 0'
    orientation = '1 0 0'
    length = 1
    A = 0.1
    D_h = 1
    fp = eos
  []
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'ch_in:in'
    m_dot = 0
    T = ${T_in}
  []
  [turbine]
    type = ShaftConnectedTurbine1Phase
    inlet = 'ch_in:out'
    outlet = 'ch_out:in'
    position = '0 0 0'
    scaling_factor_rhoEV = 1e-5
    A_ref = 0.1
    volume = 0.0002
    inertia_coeff = '1 1 1 1'
    inertia_const = 1.61397
    speed_cr_I = 1e12
    speed_cr_fr = 0
    tau_fr_coeff = '0 0 0 0'
    tau_fr_const = 0
    omega_rated = ${omega_rated}
    D_wheel = 0.4
    head_coefficient = head
    power_coefficient = power
    use_scalar_variables = false
  []
  [ch_out]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    A = 0.1
    D_h = 1
    fp = eos
  []
  [outlet]
    type = Outlet1Phase
    input = 'ch_out:out'
    p = ${p_out}
  []

  [dyno]
    type = ShaftConnectedMotor
    inertia = 10
    torque = -450
  []
  [shaft]
    type = Shaft
    connected_components = 'turbine dyno'
    initial_speed = ${omega_rated}
  []
[]


[Functions]
  [head]
    type = PiecewiseLinear
    x = '0 7e-3 1e-2'
    y = '0 15 20'
  []
  [power]
    type = PiecewiseLinear
    x = '0 6e-3 1e-2'
    y = '0 0.05 0.18'
  []

  [mfr_fn]
    type = PiecewiseLinear
    x = '0    10'
    y = '1e-6 ${mdot}'
  []
  [dts]
    type = PiecewiseConstant
    y = '5e-3 1e-2 5e-2 5e-1'
    x = '0 0.5 1 10'
  []
[]

[ControlLogic]
  [mfr_cntrl]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = m_dot
    function = mfr_fn
  []

  [speed_set_point]
    type = GetFunctionValueControl
    function = ${omega_rated}
  []
  [pid_ctrl]
    type = PIDControl
    input = omega
    set_point = speed_set_point:value
    K_i = 2
    K_p = 5
    K_d = 5
    initial_value = -450
  []
  [set_torque_value]
    type = SetComponentRealValueControl
    component = dyno
    parameter = torque
    value = pid_ctrl:output
  []
[]

[Postprocessors]
  [omega]
    type = ScalarVariable
    variable = shaft:omega
    execute_on = 'initial timestep_end'
  []
  [flow_coefficient]
    type = ElementAverageValue
    variable = flow_coeff
    block = 'turbine'
    execute_on = 'initial timestep_end'
  []
  [delta_p]
    type = ElementAverageValue
    variable = delta_p
    block = 'turbine'
    execute_on = 'initial timestep_end'
  []
  [power]
    type = ElementAverageValue
    variable = power
    block = 'turbine'
    execute_on = 'initial timestep_end'
  []
[]

[Preconditioning]
  [SMP]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'implicit-euler'
  start_time = 0
  [TimeStepper]
    type = FunctionDT
    function = dts
  []
  end_time = 20
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-4
  nl_max_its = 30

  l_tol = 1e-4
  l_max_its = 20
  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  [console]
    type = Console
    max_rows = 1
  []
  print_linear_residuals = false
[]

(modules/thermal_hydraulics/tutorials/single_phase_flow/06_custom_closures.i)

T_in = 300. # K
m_dot_in = 1e-2 # kg/s
press = 10e5 # Pa

# core parameters
core_length = 1. # m
core_n_elems = 25
core_dia = '${units 2. cm -> m}'
core_pitch = '${units 8.7 cm -> m}'
A_core = '${fparse core_pitch^2 - 0.25 *pi * core_dia^2}'
P_wet_core = '${fparse 4*core_pitch + pi * core_dia}'
Dh_core = '${fparse 4 * A_core / P_wet_core}'

# pipe parameters
pipe_dia = '${units 10. cm -> m}'
A_pipe = '${fparse 0.25 * pi * pipe_dia^2}'

tot_power = 2000 # W

# heat exchanger parameters
hx_dia_inner = '${units 12. cm -> m}'
hx_wall_thickness = '${units 5. mm -> m}'
hx_dia_outer = '${units 50. cm -> m}'
hx_radius_wall = '${fparse hx_dia_inner / 2. + hx_wall_thickness}'
hx_length = 1.5 # m
hx_n_elems = 25

m_dot_sec_in = 1. # kg/s

[GlobalParams]
  initial_p = ${press}
  initial_vel = 0.0001
  initial_T = ${T_in}
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0
  gravity_vector = '0 0 0'

  rdg_slope_reconstruction = minmod
  scaling_factor_1phase = '1 1e-2 1e-4'
  scaling_factor_rhoV = 1
  scaling_factor_rhouV = 1e-2
  scaling_factor_rhovV = 1e-2
  scaling_factor_rhowV = 1e-2
  scaling_factor_rhoEV = 1e-4
  closures = thm_closures
  fp = he
[]

[Functions]
  [m_dot_sec_fn]
    type = PiecewiseLinear
    xy_data = '
      0    0
      10 ${m_dot_sec_in}'
  []
[]

[FluidProperties]
  [he]
    type = IdealGasFluidProperties
    molar_mass = 4e-3
    gamma = 1.67
    k = 0.2556
    mu = 3.22639e-5
  []

  [water]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [thm_closures]
    type = Closures1PhaseTHM
  []
  [none_closures]
    type = Closures1PhaseNone
  []
[]

[Materials]
  [Re_mat]
    type = ADReynoldsNumberMaterial
    Re = Re
    rho = rho
    vel = vel
    D_h = D_h
    mu = mu
    block = hx/pri
  []
  [f_mat]
    type = ADParsedMaterial
    property_name = f_D
    constant_names = 'a b c'
    constant_expressions = '1 0.1 -0.5'
    material_property_names = 'Re'
    expression = 'a + b * Re^c'
    block = hx/pri
  []
  [Pr_mat]
    type = ADPrandtlNumberMaterial
    Pr = Pr
    cp = cp
    mu = mu
    k = k
    block = hx/pri
  []
  [Nu_mat]
    type = ADParsedMaterial
    property_name = 'Nu'
    constant_names = 'a b c'
    constant_expressions = '0.03 0.9 0.5'
    material_property_names = 'Re Pr'
    expression = 'a * Re ^b * Pr^c'
    block = hx/pri
  []
  [Hw_mat]
    type = ADConvectiveHeatTransferCoefficientMaterial
    D_h = D_h
    k = k
    Nu = Nu
    Hw = Hw
    block = hx/pri
  []
[]
[SolidProperties]
  [steel]
    type = ThermalFunctionSolidProperties
    rho = 8050
    k = 45
    cp = 466
  []
[]

[Components]
  [total_power]
    type = TotalPower
    power = ${tot_power}
  []
  [up_pipe_1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    length = 0.5
    n_elems = 15
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct1]
    type = JunctionParallelChannels1Phase
    position = '0 0 0.5'
    connections = 'up_pipe_1:out core_chan:in'
    volume = 1e-5
    use_scalar_variables = false
  []
  [core_chan]
    type = FlowChannel1Phase
    position = '0 0 0.5'
    orientation = '0 0 1'
    length = ${core_length}
    n_elems = ${core_n_elems}
    roughness = .0001
    A = ${A_core}
    D_h = ${Dh_core}
  []

  [core_hs]
    type = HeatStructureCylindrical
    position = '0 0 0.5'
    orientation = '0 0 1'
    length = ${core_length}
    n_elems = ${core_n_elems}
    names = 'block'
    widths = '${fparse core_dia / 2.}'
    solid_properties = 'steel'
    solid_properties_T_ref = '300'
    n_part_elems = 3
  []

  [core_heating]
    type = HeatSourceFromTotalPower
    hs = core_hs
    regions = block
    power = total_power
  []

  [core_ht]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = core_chan
    hs = core_hs
    hs_side = outer
    P_hf = '${fparse pi * core_dia}'
  []

  [jct2]
    type = JunctionParallelChannels1Phase
    position = '0 0 1.5'
    connections = 'core_chan:out up_pipe_2:in'
    volume = 1e-5
    use_scalar_variables = false
  []

  [up_pipe_2]
    type = FlowChannel1Phase
    position = '0 0 1.5'
    orientation = '0 0 1'
    length = 0.5
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct3]
    type = JunctionOneToOne1Phase
    connections = 'up_pipe_2:out top_pipe_1:in'
  []

  [top_pipe_1]
    type = FlowChannel1Phase
    position = '0 0 2'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [top_pipe_2]
    type = FlowChannel1Phase
    position = '0.5 0 2'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct4]
    type = VolumeJunction1Phase
    position = '0.5 0 2'
    volume = 1e-5
    connections = 'top_pipe_1:out top_pipe_2:in press_pipe:in'
    use_scalar_variables = false
  []

  [press_pipe]
    type = FlowChannel1Phase
    position = '0.5 0 2'
    orientation = '0 1 0'
    length = 0.2
    n_elems = 5
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [pressurizer]
    type = InletStagnationPressureTemperature1Phase
    p0 = ${press}
    T0 = ${T_in}
    input = press_pipe:out
  []

  [jct5]
    type = JunctionOneToOne1Phase
    connections = 'top_pipe_2:out down_pipe_1:in'
  []

  [down_pipe_1]
    type = FlowChannel1Phase
    position = '1 0 2'
    orientation = '0 0 -1'
    length = 0.25
    A = ${A_pipe}
    n_elems = 5
  []

  [jct6]
    type = JunctionParallelChannels1Phase
    position = '1 0 1.75'
    connections = 'down_pipe_1:out hx/pri:in'
    volume = 1e-5
    use_scalar_variables = false
  []

  [hx]
    [pri]
      type = FlowChannel1Phase
      position = '1 0 1.75'
      orientation = '0 0 -1'
      length = ${hx_length}
      n_elems = ${hx_n_elems}
      roughness = 1e-5
      A = '${fparse pi * hx_dia_inner * hx_dia_inner / 4.}'
      D_h = ${hx_dia_inner}
      closures = none_closures
    []

    [ht_pri]
      type = HeatTransferFromHeatStructure1Phase
      hs = hx/wall
      hs_side = inner
      flow_channel = hx/pri
      P_hf = '${fparse pi * hx_dia_inner}'
    []

    [wall]
      type = HeatStructureCylindrical
      position = '1 0 1.75'
      orientation = '0 0 -1'
      length = ${hx_length}
      n_elems = ${hx_n_elems}
      widths = '${hx_wall_thickness}'
      n_part_elems = '3'
      solid_properties = 'steel'
      solid_properties_T_ref = '300'
      names = '0'
      inner_radius = '${fparse hx_dia_inner / 2.}'
    []

    [ht_sec]
      type = HeatTransferFromHeatStructure1Phase
      hs = hx/wall
      hs_side = outer
      flow_channel = hx/sec
      P_hf = '${fparse 2 * pi * hx_radius_wall}'
    []

    [sec]
      type = FlowChannel1Phase
      position = '${fparse 1 + hx_wall_thickness} 0 0.25'
      orientation = '0 0 1'
      length = ${hx_length}
      n_elems = ${hx_n_elems}
      A = '${fparse pi * (hx_dia_outer * hx_dia_outer / 4. - hx_radius_wall * hx_radius_wall)}'
      D_h = '${fparse hx_dia_outer - (2 * hx_radius_wall)}'
      fp = water
      initial_T = 300
    []
  []

  [jct7]
    type = JunctionParallelChannels1Phase
    position = '1 0 0.5'
    connections = 'hx/pri:out down_pipe_2:in'
    volume = 1e-5
    use_scalar_variables = false
  []

  [down_pipe_2]
    type = FlowChannel1Phase
    position = '1 0 0.25'
    orientation = '0 0 -1'
    length = 0.25
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct8]
    type = JunctionOneToOne1Phase
    connections = 'down_pipe_2:out bottom_1:in'
  []

  [bottom_1]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '-1 0 0'
    length = 0.5
    n_elems = 5
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [pump]
    type = Pump1Phase
    position = '0.5 0 0'
    connections = 'bottom_1:out bottom_2:in'
    volume = 1e-4
    A_ref = ${A_pipe}
    head = 0
    use_scalar_variables = false
  []

  [bottom_2]
    type = FlowChannel1Phase
    position = '0.5 0 0'
    orientation = '-1 0 0'
    length = 0.5
    n_elems = 5
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct9]
    type = JunctionOneToOne1Phase
    connections = 'bottom_2:out up_pipe_1:in'
  []

  [inlet_sec]
    type = InletMassFlowRateTemperature1Phase
    input = 'hx/sec:in'
    m_dot = 0
    T = 300
  []

  [outlet_sec]
    type = Outlet1Phase
    input = 'hx/sec:out'
    p = 1e5
  []
[]

[ControlLogic]
  [set_point]
    type = GetFunctionValueControl
    function = ${m_dot_in}
  []

  [pid]
    type = PIDControl
    initial_value = 0.0
    set_point = set_point:value
    input = m_dot_pump
    K_p = 1.
    K_i = 4.
    K_d = 0
  []

  [set_pump_head]
    type = SetComponentRealValueControl
    component = pump
    parameter = head
    value = pid:output
  []

  [m_dot_sec_inlet_ctrl]
    type = GetFunctionValueControl
    function = m_dot_sec_fn
  []

  [set_m_dot_sec_ctrl]
    type = SetComponentRealValueControl
    component = inlet_sec
    parameter = m_dot
    value = m_dot_sec_inlet_ctrl:value
  []
[]

[Postprocessors]
  [power_to_coolant]
    type = ADHeatRateConvection1Phase
    block = core_chan
    P_hf = '${fparse pi *core_dia}'
  []

  [m_dot_pump]
    type = ADFlowJunctionFlux1Phase
    boundary = core_chan:in
    connection_index = 1
    equation = mass
    junction = jct7
  []

  [core_T_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = T
  []

  [core_p_in]
    type = SideAverageValue
    boundary = core_chan:in
    variable = p
  []

  [core_p_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = p
  []

  [core_delta_p]
    type = ParsedPostprocessor
    pp_names = 'core_p_in core_p_out'
    expression = 'core_p_in - core_p_out'
  []

  [hx_pri_T_out]
    type = SideAverageValue
    boundary = hx/pri:out
    variable = T
  []

  [hx_sec_T_in]
    type = SideAverageValue
    boundary = inlet_sec
    variable = T
  []

  [hx_sec_T_out]
    type = SideAverageValue
    boundary = outlet_sec
    variable = T
  []
  [m_dot_sec]
    type = ADFlowBoundaryFlux1Phase
    boundary = inlet_sec
    equation = mass
  []

  [Hw_hx_pri]
    type = ADElementAverageMaterialProperty
    mat_prop = Hw
    block = hx/pri
  []
  [fD_hx_pri]
    type = ADElementAverageMaterialProperty
    mat_prop = f_D
    block = hx/pri
  []

[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  start_time = 0

  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 1
  []
  dtmax = 5
  end_time = 500

  line_search = basic
  solve_type = NEWTON

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 25

[]

[Outputs]
  exodus = true

  [console]
    type = Console
    max_rows = 1
    outlier_variable_norms = false
  []
  print_linear_residuals = false
[]

(modules/thermal_hydraulics/test/tests/components/deprecated/gate_valve.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  closures = simple_closures
  fp = fp

  f = 0.0

  initial_T = 300
  initial_p = 1e5
  initial_vel = 0
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
    molar_mass = 0.02897
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 1
    T = 300
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 2
    A = 0.1
  []

  [valve]
    type = GateValve
    connections = 'pipe1:out pipe2:in'
    open_area_fraction = 1
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '0.5 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 2
    A = 0.1
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2

  solve_type = NEWTON
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 20

  l_tol = 1e-4

  start_time = 0.0
  end_time = 1.0
  dt = 0.01
  abort_on_solve_fail = true
[]

(modules/thermal_hydraulics/test/tests/components/junction_one_to_one_1phase/constriction_1phase.i)

# This test is used to test the JunctionOneToOne1Phase1Phase component with unequal areas
# at the junction. The downstream flow channel has an area half that of the
# upstream pipe, so there should be a pressure increase just upstream of the
# junction due to the partial wall. The velocity should increase through the
# junction (approximately by a factor of 2, but there are compressibility effects).

[GlobalParams]
  gravity_vector = '0 0 0'

  fp = fp
  closures = simple_closures
  f = 0

  initial_T = 300
  initial_p = 1e5
  initial_vel = 1
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
    molar_mass = 11.64024372
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [left_boundary]
    type = InletDensityVelocity1Phase
    input = 'left_channel:in'
    rho = 466.6666667
    vel = 1
  []

  [left_channel]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 50
    A = 1.0
  []

  [junction]
    type = JunctionOneToOne1Phase
    connections = 'left_channel:out right_channel:in'
  []

  [right_channel]
    type = FlowChannel1Phase
    position = '0.5 0 0'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 50
    A = 0.5
  []

  [right_boundary]
    type = Outlet1Phase
    input = 'right_channel:out'
    p = 1e5
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  scheme = bdf2
  dt = 0.01
  num_steps = 10
  abort_on_solve_fail = true

  solve_type = NEWTON
  nl_rel_tol = 1e-10
  nl_abs_tol = 1e-8
  nl_max_its = 60

  l_tol = 1e-4
[]

[Outputs]
  exodus = true
  show = 'p T vel'
  execute_on = 'initial timestep_end'
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/components/flow_channel_1phase/err.wrong_fp.i)

[GlobalParams]
  closures = simple_closures

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0
[]

[FluidProperties]
  [fp_2phase]
    type = StiffenedGasTwoPhaseFluidProperties
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    A = 1.
    D_h = 1.12837916709551
    f = 0.01
    length = 1
    n_elems = 100
    fp = fp_2phase   # this is wrong
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 1e5
    T0 = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 9.5e4
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 1e-4
  dtmin = 1.e-7

  solve_type = 'PJFNK'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-8
  l_max_its = 100

  start_time = 0.0
  num_steps = 1
[]

(modules/thermal_hydraulics/test/tests/components/volume_junction_1phase/phy.deadend.i)

# Junction between 3 pipes, 1 of which goes to a dead-end. In the steady-state,
# no flow should go into the dead-end pipe.

[GlobalParams]
  gravity_vector = '0 0 0'

  scaling_factor_1phase = '1 1 1e-5'

  initial_T = 250
  initial_p = 1e5
  initial_vel_x = 1
  initial_vel_y = 0
  initial_vel_z = 0

  closures = simple_closures
[]

[AuxVariables]
  [p0]
    block = 'inlet_pipe outlet_pipe deadend_pipe'
    family = MONOMIAL
    order = CONSTANT
  []
[]

[AuxKernels]
  [p0_kernel]
    type = StagnationPressureAux
    variable = p0
    fp = eos
    e = e
    v = v
    vel = vel
  []
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    q = 0
    q_prime = 0
    p_inf = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [T0]
    type = ParsedFunction
    expression = 'if (x < 1, 300 + 50 * sin(2*pi*x + 1.5*pi), 250)'
  []
[]

[Components]
  [inlet]
    type = InletDensityVelocity1Phase
    input = 'inlet_pipe:in'
    rho = 1.37931034483
    vel = 1
  []

  [inlet_pipe]
    type = FlowChannel1Phase
    fp = eos

    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    A = 1

    f = 0

    initial_T = T0
    initial_p = 1e5
    initial_vel = 1

    n_elems = 20
  []

  [junction1]
    type = VolumeJunction1Phase
    connections = 'inlet_pipe:out deadend_pipe:in outlet_pipe:in'
    position = '1 0 0'
    volume = 1e-8
    use_scalar_variables = false
  []

  [outlet_pipe]
    type = FlowChannel1Phase
    fp = eos

    position = '1 0 0'
    orientation = '1 0 0'
    length = 1
    A = 1

    f = 0

    initial_T = 250
    initial_p = 1e5
    initial_vel = 1

    n_elems = 20
  []

  [outlet]
    type = Outlet1Phase
    input = 'outlet_pipe:out'
    p = 1e5
  []

  [deadend_pipe]
    type = FlowChannel1Phase
    fp = eos

    position = '1 0 0'
    orientation = '0 1 0'
    length = 1
    A = 1

    f = 0

    initial_T = 250
    initial_p = 1e5
    initial_vel = 0

    n_elems = 20
  []

  [deadend]
    type = SolidWall1Phase
    input = 'deadend_pipe:out'
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-6
  l_max_its = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0
  end_time = 5
  dt = 0.1

  abort_on_solve_fail = true
[]

[Postprocessors]
  # These post-processors are used for testing that the stagnation pressure in
  # the dead-end pipe is equal to the inlet stagnation pressure.
  [p0_inlet]
    type = SideAverageValue
    variable = p0
    boundary = inlet_pipe:in
  []
  [p0_deadend]
    type = SideAverageValue
    variable = p0
    boundary = deadend_pipe:out
  []
  [test_rel_err]
    type = RelativeDifferencePostprocessor
    value1 = p0_deadend
    value2 = p0_inlet
  []
[]

[Outputs]
  [out]
    type = CSV
    show = test_rel_err
    sync_only = true
    sync_times = '1 2 3 4 5'
  []
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/components/volume_junction_1phase/err.missing_ics.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  A = 1e-4
  f = 0
  fp = fp

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    p_inf = 0
    q = 0
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    # Stagnation property with p = 1e5 Pa, T = 250 K, vel = 1 m/s
    p0 = 100000.68965687
    T0 = 250.00049261084
  []

  [pipe1]
    type = FlowChannel1Phase

    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 2

    initial_p = 1e5
    initial_T = 250
    initial_vel = 0
  []

  [junction]
    type = VolumeJunction1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1.02 0 0'
    volume = 0.1
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase

    position = '1.04 0 0'
    orientation = '1 0 0'
    length = 0.96
    n_elems = 2

    initial_p = 1e5
    initial_T = 250
    initial_vel = 0
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Executioner]
  type = Transient
  abort_on_solve_fail = true
[]

(modules/thermal_hydraulics/tutorials/single_phase_flow/05_secondary_side.i)

T_in = 300. # K
m_dot_in = 1e-2 # kg/s
press = 10e5 # Pa

# core parameters
core_length = 1. # m
core_n_elems = 25
core_dia = '${units 2. cm -> m}'
core_pitch = '${units 8.7 cm -> m}'
A_core = '${fparse core_pitch^2 - 0.25 *pi * core_dia^2}'
P_wet_core = '${fparse 4*core_pitch + pi * core_dia}'
Dh_core = '${fparse 4 * A_core / P_wet_core}'

# pipe parameters
pipe_dia = '${units 10. cm -> m}'
A_pipe = '${fparse 0.25 * pi * pipe_dia^2}'

tot_power = 2000 # W

# heat exchanger parameters
hx_dia_inner = '${units 12. cm -> m}'
hx_wall_thickness = '${units 5. mm -> m}'
hx_dia_outer = '${units 50. cm -> m}'
hx_radius_wall = '${fparse hx_dia_inner / 2. + hx_wall_thickness}'
hx_length = 1.5 # m
hx_n_elems = 25

m_dot_sec_in = 1. # kg/s

[GlobalParams]
  initial_p = ${press}
  initial_vel = 0.0001
  initial_T = ${T_in}
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0
  gravity_vector = '0 0 0'

  rdg_slope_reconstruction = minmod
  scaling_factor_1phase = '1 1e-2 1e-4'
  scaling_factor_rhoV = 1
  scaling_factor_rhouV = 1e-2
  scaling_factor_rhovV = 1e-2
  scaling_factor_rhowV = 1e-2
  scaling_factor_rhoEV = 1e-4
  closures = thm_closures
  fp = he
[]

[Functions]
  [m_dot_sec_fn]
    type = PiecewiseLinear
    xy_data = '
      0    0
      10 ${m_dot_sec_in}'
  []
[]

[FluidProperties]
  [he]
    type = IdealGasFluidProperties
    molar_mass = 4e-3
    gamma = 1.67
    k = 0.2556
    mu = 3.22639e-5
  []

  [water]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [thm_closures]
    type = Closures1PhaseTHM
  []
[]

[SolidProperties]
  [steel]
    type = ThermalFunctionSolidProperties
    rho = 8050
    k = 45
    cp = 466
  []
[]

[Components]
  [total_power]
    type = TotalPower
    power = ${tot_power}
  []
  [up_pipe_1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    length = 0.5
    n_elems = 15
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct1]
    type = JunctionParallelChannels1Phase
    position = '0 0 0.5'
    connections = 'up_pipe_1:out core_chan:in'
    volume = 1e-5
    use_scalar_variables = false
  []
  [core_chan]
    type = FlowChannel1Phase
    position = '0 0 0.5'
    orientation = '0 0 1'
    length = ${core_length}
    n_elems = ${core_n_elems}
    roughness = .0001
    A = ${A_core}
    D_h = ${Dh_core}
  []

  [core_hs]
    type = HeatStructureCylindrical
    position = '0 0 0.5'
    orientation = '0 0 1'
    length = ${core_length}
    n_elems = ${core_n_elems}
    names = 'block'
    widths = '${fparse core_dia / 2.}'
    solid_properties = 'steel'
    solid_properties_T_ref = '300'
    n_part_elems = 3
  []

  [core_heating]
    type = HeatSourceFromTotalPower
    hs = core_hs
    regions = block
    power = total_power
  []

  [core_ht]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = core_chan
    hs = core_hs
    hs_side = outer
    P_hf = '${fparse pi * core_dia}'
  []

  [jct2]
    type = JunctionParallelChannels1Phase
    position = '0 0 1.5'
    connections = 'core_chan:out up_pipe_2:in'
    volume = 1e-5
    use_scalar_variables = false
  []

  [up_pipe_2]
    type = FlowChannel1Phase
    position = '0 0 1.5'
    orientation = '0 0 1'
    length = 0.5
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct3]
    type = JunctionOneToOne1Phase
    connections = 'up_pipe_2:out top_pipe_1:in'
  []

  [top_pipe_1]
    type = FlowChannel1Phase
    position = '0 0 2'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [top_pipe_2]
    type = FlowChannel1Phase
    position = '0.5 0 2'
    orientation = '1 0 0'
    length = 0.5
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct4]
    type = VolumeJunction1Phase
    position = '0.5 0 2'
    volume = 1e-5
    connections = 'top_pipe_1:out top_pipe_2:in press_pipe:in'
    use_scalar_variables = false
  []

  [press_pipe]
    type = FlowChannel1Phase
    position = '0.5 0 2'
    orientation = '0 1 0'
    length = 0.2
    n_elems = 5
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [pressurizer]
    type = InletStagnationPressureTemperature1Phase
    p0 = ${press}
    T0 = ${T_in}
    input = press_pipe:out
  []

  [jct5]
    type = JunctionOneToOne1Phase
    connections = 'top_pipe_2:out down_pipe_1:in'
  []

  [down_pipe_1]
    type = FlowChannel1Phase
    position = '1 0 2'
    orientation = '0 0 -1'
    length = 0.25
    A = ${A_pipe}
    n_elems = 5
  []

  [jct6]
    type = JunctionParallelChannels1Phase
    position = '1 0 1.75'
    connections = 'down_pipe_1:out hx/pri:in'
    volume = 1e-5
    use_scalar_variables = false
  []

  [hx]
    [pri]
      type = FlowChannel1Phase
      position = '1 0 1.75'
      orientation = '0 0 -1'
      length = ${hx_length}
      n_elems = ${hx_n_elems}
      roughness = 1e-5
      A = '${fparse pi * hx_dia_inner * hx_dia_inner / 4.}'
      D_h = ${hx_dia_inner}
    []

    [ht_pri]
      type = HeatTransferFromHeatStructure1Phase
      hs = hx/wall
      hs_side = inner
      flow_channel = hx/pri
      P_hf = '${fparse pi * hx_dia_inner}'
    []

    [wall]
      type = HeatStructureCylindrical
      position = '1 0 1.75'
      orientation = '0 0 -1'
      length = ${hx_length}
      n_elems = ${hx_n_elems}
      widths = '${hx_wall_thickness}'
      n_part_elems = '3'
      solid_properties = 'steel'
      solid_properties_T_ref = '300'
      names = '0'
      inner_radius = '${fparse hx_dia_inner / 2.}'
    []

    [ht_sec]
      type = HeatTransferFromHeatStructure1Phase
      hs = hx/wall
      hs_side = outer
      flow_channel = hx/sec
      P_hf = '${fparse 2 * pi * hx_radius_wall}'
    []

    [sec]
      type = FlowChannel1Phase
      position = '${fparse 1 + hx_wall_thickness} 0 0.25'
      orientation = '0 0 1'
      length = ${hx_length}
      n_elems = ${hx_n_elems}
      A = '${fparse pi * (hx_dia_outer * hx_dia_outer / 4. - hx_radius_wall * hx_radius_wall)}'
      D_h = '${fparse hx_dia_outer - (2 * hx_radius_wall)}'
      fp = water
      initial_T = 300
    []
  []

  [jct7]
    type = JunctionParallelChannels1Phase
    position = '1 0 0.5'
    connections = 'hx/pri:out down_pipe_2:in'
    volume = 1e-5
    use_scalar_variables = false
  []

  [down_pipe_2]
    type = FlowChannel1Phase
    position = '1 0 0.25'
    orientation = '0 0 -1'
    length = 0.25
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct8]
    type = JunctionOneToOne1Phase
    connections = 'down_pipe_2:out bottom_1:in'
  []

  [bottom_1]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '-1 0 0'
    length = 0.5
    n_elems = 5
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [pump]
    type = Pump1Phase
    position = '0.5 0 0'
    connections = 'bottom_1:out bottom_2:in'
    volume = 1e-4
    A_ref = ${A_pipe}
    head = 0
    use_scalar_variables = false
  []

  [bottom_2]
    type = FlowChannel1Phase
    position = '0.5 0 0'
    orientation = '-1 0 0'
    length = 0.5
    n_elems = 5
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct9]
    type = JunctionOneToOne1Phase
    connections = 'bottom_2:out up_pipe_1:in'
  []

  [inlet_sec]
    type = InletMassFlowRateTemperature1Phase
    input = 'hx/sec:in'
    m_dot = 0
    T = 300
  []

  [outlet_sec]
    type = Outlet1Phase
    input = 'hx/sec:out'
    p = 1e5
  []
[]

[ControlLogic]
  [set_point]
    type = GetFunctionValueControl
    function = ${m_dot_in}
  []

  [pid]
    type = PIDControl
    initial_value = 0.0
    set_point = set_point:value
    input = m_dot_pump
    K_p = 1.
    K_i = 4.
    K_d = 0
  []

  [set_pump_head]
    type = SetComponentRealValueControl
    component = pump
    parameter = head
    value = pid:output
  []

  [m_dot_sec_inlet_ctrl]
    type = GetFunctionValueControl
    function = m_dot_sec_fn
  []

  [set_m_dot_sec_ctrl]
    type = SetComponentRealValueControl
    component = inlet_sec
    parameter = m_dot
    value = m_dot_sec_inlet_ctrl:value
  []
[]

[Postprocessors]
  [power_to_coolant]
    type = ADHeatRateConvection1Phase
    block = core_chan
    P_hf = '${fparse pi *core_dia}'
  []

  [m_dot_pump]
    type = ADFlowJunctionFlux1Phase
    boundary = core_chan:in
    connection_index = 1
    equation = mass
    junction = jct7
  []

  [core_T_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = T
  []

  [core_p_in]
    type = SideAverageValue
    boundary = core_chan:in
    variable = p
  []

  [core_p_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = p
  []

  [core_delta_p]
    type = ParsedPostprocessor
    pp_names = 'core_p_in core_p_out'
    expression = 'core_p_in - core_p_out'
  []

  [hx_pri_T_out]
    type = SideAverageValue
    boundary = hx/pri:out
    variable = T
  []

  [hx_sec_T_in]
    type = SideAverageValue
    boundary = inlet_sec
    variable = T
  []

  [hx_sec_T_out]
    type = SideAverageValue
    boundary = outlet_sec
    variable = T
  []
  [m_dot_sec]
    type = ADFlowBoundaryFlux1Phase
    boundary = inlet_sec
    equation = mass
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  start_time = 0

  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 1
  []
  dtmax = 5
  end_time = 500

  line_search = basic
  solve_type = NEWTON

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  nl_rel_tol = 0
  nl_abs_tol = 1e-8
  nl_max_its = 25

[]

[Outputs]
  exodus = true

  [console]
    type = Console
    max_rows = 1
    outlier_variable_norms = false
  []
  print_linear_residuals = false
[]

(modules/thermal_hydraulics/test/tests/components/inlet_stagnation_p_t_1phase/phy.stagnation_p_T_steady_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 101325
  initial_T = 300
  initial_vel = 34.84507

  scaling_factor_1phase = '1 1 1e-4'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = eos
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A = 1.
    f = 0.0

    length = 1
    n_elems = 10
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 102041.128
    T0 = 300.615
    reversible = false
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 101325
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 1e-4
  num_steps = 10
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100
[]


[Outputs]
  [out]
    type = Exodus
  []
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_specified_temperature_1phase/err.no_phf.i)

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[SolidProperties]
  [mat]
    type = ThermalFunctionSolidProperties
    k = 1
    cp = 2
    rho = 3
  []
[]

[Components]
  [fch1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 1 0'
    length = 1
    n_elems = 2
    A = 1
    closures = simple_closures
    fp = fp
    f = 0.01

    initial_p = 1e5
    initial_T = 300
    initial_vel = 0
  []

  [hs]
    type = HeatStructureCylindrical
    position = '0 0 0'
    orientation = '1 0 0'

    length = 1
    n_elems = 2
    names = 'blk'
    widths = '0.1'
    n_part_elems = '1'
    solid_properties = 'mat'
    solid_properties_T_ref = '300'

    initial_T = 300
  []

  [hx]
    type = HeatTransferFromHeatStructure1Phase
    hs = hs
    hs_side = START
    flow_channel = fch1
    Hw = 0
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'fch1:in'
    m_dot = 1
    T = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'fch1:out'
    p = 1e5
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 0.1
  num_steps = 1
[]

(modules/thermal_hydraulics/test/tests/postprocessors/flow_junction_flux_1phase/flow_junction_flux_1phase.i)

# This input file tests mass conservation at steady-state by looking at the
# net mass flux into the domain.

T_in = 523.0
m_dot = 100
p_out = 7e6

[GlobalParams]
  initial_p = ${p_out}
  initial_vel = 1
  initial_T = ${T_in}
  gravity_vector = '0 0 0'
  closures = simple_closures
  n_elems = 3
  f = 0
  scaling_factor_1phase = '1 1 1e-5'
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet_bc]
    type = InletMassFlowRateTemperature1Phase
    input = 'inlet:in'
    m_dot = ${m_dot}
    T = ${T_in}
  []
  [inlet]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 11'
    orientation = '0 0 -1'
    length = 1
    A = 3
  []
  [inlet_plenum]
    type = VolumeJunction1Phase
    position = '0 0 10'
    initial_vel_x = 0
    initial_vel_y = 0
    initial_vel_z = 1
    connections = 'inlet:out channel1:in channel2:in'
    volume = 1
    scaling_factor_rhoEV = '1e-5'
    use_scalar_variables = false
  []
  [channel1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 10'
    orientation = '0 0 -1'
    length = 10
    A = 4
    D_h = 1
  []
  [K_bypass]
    type = FormLossFromFunction1Phase
    K_prime = 500
    flow_channel = channel1
  []
  [channel2]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 10'
    orientation = '0 0 -1'
    length = 10
    A = 1
    D_h = 1
  []
  [outlet_plenum]
    type = VolumeJunction1Phase
    position = '0 0 0'
    initial_vel_x = 1
    initial_vel_y = 0
    initial_vel_z = 1
    connections = 'channel1:out channel2:out outlet:in'
    volume = 1
    scaling_factor_rhoEV = '1e-5'
    use_scalar_variables = false
  []
  [outlet]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '0 0 -1'
    length = 1
    A = 1
  []
  [outlet_bc]
    type = Outlet1Phase
    p = ${p_out}
    input = 'outlet:out'
  []
[]

[Postprocessors]
  [inlet_in_m_dot]
    type = ADFlowBoundaryFlux1Phase
    boundary = 'inlet_bc'
    equation = mass
  []
  [inlet_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'inlet:out'
    connection_index = 0
    junction = inlet_plenum
    equation = mass
  []

  [channel1_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel1:in'
    connection_index = 1
    junction = inlet_plenum
    equation = mass
  []
  [channel1_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel1:out'
    connection_index = 0
    junction = outlet_plenum
    equation = mass
  []

  [channel2_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel2:in'
    connection_index = 2
    junction = inlet_plenum
    equation = mass
  []
  [channel2_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel2:out'
    connection_index = 1
    junction = outlet_plenum
    equation = mass
  []

  [outlet_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'outlet:in'
    connection_index = 2
    junction = outlet_plenum
    equation = mass
  []
  [outlet_out_m_dot]
    type = ADFlowBoundaryFlux1Phase
    boundary = 'outlet_bc'
    equation = mass
  []

  [net_mass_flow_rate_domain]
    type = LinearCombinationPostprocessor
    pp_names = 'inlet_in_m_dot outlet_out_m_dot'
    pp_coefs = '1 -1'
  []
  [net_mass_flow_rate_volume_junction]
    type = LinearCombinationPostprocessor
    pp_names = 'inlet_out_m_dot channel1_in_m_dot channel2_in_m_dot'
    pp_coefs = '1 -1 -1'
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2
  start_time = 0
  end_time = 10000
  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 0.01
    optimal_iterations = 8
    iteration_window = 2
  []
  timestep_tolerance = 1e-6
  abort_on_solve_fail = true

  line_search = none
  nl_rel_tol = 1e-8
  nl_abs_tol = 2e-8
  nl_max_its = 25
  l_tol = 1e-3
  l_max_its = 5
  petsc_options = '-snes_converged_reason'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu     '
[]

[Outputs]
  [out]
    type = CSV
    execute_on = 'FINAL'
    show = 'net_mass_flow_rate_domain net_mass_flow_rate_volume_junction'
  []
[]

(modules/thermal_hydraulics/test/tests/components/volume_junction_1phase/equal_area_with_junction.i)

# Tests a junction between 2 flow channels of equal area and orientation. A
# sinusoidal density shape is advected to the right and should not be affected
# by the junction; the solution should be identical to the equivalent
# no-junction solution.

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_vel = 1

  A = 25

  f = 0

  fp = fp

  scaling_factor_1phase = '0.04 0.04 0.04e-5'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    p_inf = 0
    q = 0
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [T0]
    type = CosineHumpFunction
    axis = x
    hump_center_position = 1
    hump_width = 0.5
    hump_begin_value = 250
    hump_center_value = 300
  []
[]

[Components]
  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    # Stagnation property with p = 1e5 Pa, T = 250 K, vel = 1 m/s
    p0 = 100000.68965687
    T0 = 250.00049261084
  []

  [pipe1]
    type = FlowChannel1Phase

    position = '0 0 0'
    orientation = '1 0 0'
    length = 1

    initial_T = T0

    n_elems = 25
  []

  [junction]
    type = VolumeJunction1Phase
    connections = 'pipe1:out pipe2:in'

    # NOTE: volume parameters are added via command-line arguments by tests file.
    position = '1.02 0 0'

    initial_T = T0
    initial_vel_x = 1
    initial_vel_y = 0
    initial_vel_z = 0

    scaling_factor_rhoV  = 1
    scaling_factor_rhouV = 1
    scaling_factor_rhovV = 1
    scaling_factor_rhowV = 1
    scaling_factor_rhoEV = 1e-5

    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase

    position = '1.04 0 0'
    orientation = '1 0 0'
    length = 0.96

    initial_T = T0

    n_elems = 24
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  scheme = 'bdf2'
  start_time = 0
  dt = 0.01
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Postprocessors]
  [junction_rho]
    type = ElementAverageValue
    variable = rhoV
    block = 'junction'
    execute_on = 'initial timestep_end'
  []
  [junction_rhou]
    type = ElementAverageValue
    variable = rhouV
    block = 'junction'
    execute_on = 'initial timestep_end'
  []
  [junction_rhoE]
    type = ElementAverageValue
    variable = rhoEV
    block = 'junction'
    execute_on = 'initial timestep_end'
  []
[]

[Outputs]
  [out]
    type = CSV
    execute_scalars_on = 'none'
    execute_on = 'initial timestep_end'
  []
[]

(modules/thermal_hydraulics/test/tests/components/junction_parallel_channels_1phase/err.missing_ics.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  A = 1e-4
  f = 0
  fp = fp

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    p_inf = 0
    q = 0
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    # Stagnation property with p = 1e5 Pa, T = 250 K, vel = 1 m/s
    p0 = 100000.68965687
    T0 = 250.00049261084
  []

  [pipe1]
    type = FlowChannel1Phase

    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 2

    initial_p = 1e5
    initial_T = 250
    initial_vel = 0
  []

  [junction]
    type = JunctionParallelChannels1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1.02 0 0'
    volume = 0.1
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase

    position = '1.04 0 0'
    orientation = '1 0 0'
    length = 0.96
    n_elems = 2

    initial_p = 1e5
    initial_T = 250
    initial_vel = 0
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Executioner]
  type = Transient
  abort_on_solve_fail = true
[]

(modules/thermal_hydraulics/test/tests/problems/brayton_cycle/recuperated_brayton_cycle.i)

# This input file models an open, recuperated Brayton cycle with a PID
# controlled start up using a coupled motor.
#
# Heat is supplied to the system by a volumetric heat source, and a second heat
# source is used to model a recuperator. The recuperator transfers heat from the
# turbine exhaust gas to the compressor outlet gas.
#
# Initially the fluid and heat structures are at rest at ambient conditions,
# and the shaft speed is zero.
# The transient is controlled as follows:
#   * 0   - 2000 s: Motor increases shaft speed to approx. 85,000 RPM by PID control
#   * 1000 - 8600 s: Power in main heat source increases from 0 - 104 kW
#   * 2000 - 200000 s: Torque supplied by turbine increases to steady state level
#                      as working fluid temperature increases. Torque supplied by
#                      the motor is ramped down to 0 N-m transitioning shaft control
#                      to the turbine at its rated speed of 96,000 RPM.


I_motor = 1.0

I_generator = 1.0
generator_torque_per_shaft_speed = -0.00025

motor_ramp_up_duration = 3605
motor_ramp_down_duration = 1800
post_motor_time = 2160000
t1 = ${motor_ramp_up_duration}
t2 = ${fparse t1 + motor_ramp_down_duration}
t3 = ${fparse t2 + post_motor_time}

D1 = 0.15
D2 = ${D1}
D3 = ${D1}
D4 = ${D1}
D5 = ${D1}
D6 = ${D1}
D7 = ${D1}
D8 = ${D1}

A1 = ${fparse 0.25 * pi * D1^2}
A2 = ${fparse 0.25 * pi * D2^2}
A3 = ${fparse 0.25 * pi * D3^2}
A4 = ${fparse 0.25 * pi * D4^2}
A5 = ${fparse 0.25 * pi * D5^2}
A6 = ${fparse 0.25 * pi * D6^2}
A7 = ${fparse 0.25 * pi * D7^2}
A8 = ${fparse 0.25 * pi * D8^2}

recuperator_width = 0.15

L1 = 5.0
L2 = ${L1}
L3 = ${fparse 2 * L1}
L4 = ${fparse 2 * L1}
L5 = ${L1}
L6 = ${L1}
L7 = ${fparse L1 + recuperator_width}
L8 = ${L1}

x1 = 0.0
x2 = ${fparse x1 + L1}
x3 = ${fparse x2 + L2}
x4 = ${x3}
x5 = ${fparse x4 - L4}
x6 = ${x5}
x7 = ${fparse x6 + L6}
x8 = ${fparse x7 + L7}

y1 = 0
y2 = ${y1}
y3 = ${y2}
y4 = ${fparse y3 - L3}
y5 = ${y4}
y6 = ${fparse y5 + L5}
y7 = ${y6}
y8 = ${y7}

x1_out = ${fparse x1 + L1 - 0.001}
x2_in = ${fparse x2 + 0.001}
y5_in = ${fparse y5 + 0.001}
x6_out = ${fparse x6 + L6 - 0.001}
x7_in = ${fparse x7 + 0.001}
y8_in = ${fparse y8 + 0.001}
y8_out = ${fparse y8 + L8 - 0.001}
hot_leg_in = ${y8_in}
hot_leg_out = ${y8_out}
cold_leg_in = ${fparse y3 - 0.001}
cold_leg_out = ${fparse y3 - (L3/2) - 0.001}

n_elems1 = 5
n_elems2 = ${n_elems1}
n_elems3 = ${fparse 2 * n_elems1}
n_elems4 = ${fparse 2 * n_elems1}
n_elems5 = ${n_elems1}
n_elems6 = ${n_elems1}
n_elems7 = ${n_elems1}
n_elems8 = ${n_elems1}

A_ref_comp = ${fparse 0.5 * (A1 + A2)}
V_comp = ${fparse A_ref_comp * 1.0}
I_comp = 1.0

A_ref_turb = ${fparse 0.5 * (A4 + A5)}
V_turb = ${fparse A_ref_turb * 1.0}
I_turb = 1.0

c0_rated_comp = 351.6925137
rho0_rated_comp = 1.146881112

rated_mfr = 0.25

speed_rated_rpm = 96000
speed_rated = ${fparse speed_rated_rpm * 2 * pi / 60.0}

speed_initial = 0

eff_comp = 0.79
eff_turb = 0.843

T_ambient = 300
p_ambient = 1e5

hs_power = 105750
[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = ${p_ambient}
  initial_T = ${T_ambient}
  initial_vel = 0
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0

  fp = fp_air
  closures = closures
  f = 0

  scaling_factor_1phase = '1 1 1e-5'
  scaling_factor_rhoV = 1
  scaling_factor_rhouV = 1e-2
  scaling_factor_rhovV = 1e-2
  scaling_factor_rhowV = 1e-2
  scaling_factor_rhoEV = 1e-5
  scaling_factor_temperature = 1e-2
  rdg_slope_reconstruction = none
[]

[FluidProperties]
  [fp_air]
    type = IdealGasFluidProperties
    emit_on_nan = none
  []
[]

[SolidProperties]
  [steel]
    type = ThermalFunctionSolidProperties
    rho = 8050
    k = 45
    cp = 466
  []
[]

[Closures]
  [closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]

  ##########################
  # Motor
  ##########################


  # Functions for control logic that determines when to shut off the PID system
  [is_tripped_fn]
    type = ParsedFunction
    symbol_names = 'motor_torque turbine_torque'
    symbol_values = 'motor_torque turbine_torque'
    expression = 'turbine_torque > motor_torque'
  []
  [PID_tripped_constant_value]
    type = ConstantFunction
    value = 1
  []
  [PID_tripped_status_fn]
    type = ParsedFunction
    symbol_values = 'PID_trip_status'
    symbol_names = 'PID_trip_status'
    expression = 'PID_trip_status'
  []
  [time_fn]
    type = ParsedFunction
    expression = t
  []

  # Shutdown function which ramps down the motor once told by the control logic
  [motor_torque_fn_shutdown]
    type = ParsedFunction
    symbol_values = 'PID_trip_status time_trip'
    symbol_names = 'PID_trip_status time_trip'
    expression = 'if(PID_trip_status = 1, max(2.4 - (2.4 * ((t - time_trip) / 35000)),0.0), 1)'
  []

  # Generates motor power curve
  [motor_power_fn]
    type = ParsedFunction
    expression = 'torque * speed'
    symbol_names = 'torque speed'
    symbol_values = 'motor_torque shaft:omega'
  []

  ##########################
  # Generator
  ##########################

  # Generates generator torque curve
  [generator_torque_fn]
    type = ParsedFunction
    expression = 'slope * t'
    symbol_names = 'slope'
    symbol_values = '${generator_torque_per_shaft_speed}'
  []
  # Generates generator power curve
  [generator_power_fn]
    type = ParsedFunction
    expression = 'torque * speed'
    symbol_names = 'torque speed'
    symbol_values = 'generator_torque shaft:omega'
  []

  ##########################
  # Reactor
  ##########################

  # Ramps up reactor power when activated by control logic
  [power_fn]
    type = PiecewiseLinear
    x = '0 1000 8600'
    y = '0 0 ${hs_power}'
  []

  ##########################
  # Compressor
  ##########################

  # compressor pressure ratios
  [rp_comp1]
    type = PiecewiseLinear
    data_file = 'rp_comp1.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_comp2]
    type = PiecewiseLinear
    data_file = 'rp_comp2.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_comp3]
    type = PiecewiseLinear
    data_file = 'rp_comp3.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_comp4]
    type = PiecewiseLinear
    data_file = 'rp_comp4.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_comp5]
    type = PiecewiseLinear
    data_file = 'rp_comp5.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []

  # compressor efficiencies
  [eff_comp1]
    type = ConstantFunction
    value = ${eff_comp}
  []
  [eff_comp2]
    type = ConstantFunction
    value = ${eff_comp}
  []
  [eff_comp3]
    type = ConstantFunction
    value = ${eff_comp}
  []
  [eff_comp4]
    type = ConstantFunction
    value = ${eff_comp}
  []
  [eff_comp5]
    type = ConstantFunction
    value = ${eff_comp}
  []

  ##########################
  # Turbine
  ##########################

  # turbine pressure ratios
  [rp_turb0]
    type = ConstantFunction
    value = 1
  []
  [rp_turb1]
    type = PiecewiseLinear
    data_file = 'rp_turb1.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_turb2]
    type = PiecewiseLinear
    data_file = 'rp_turb2.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_turb3]
    type = PiecewiseLinear
    data_file = 'rp_turb3.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_turb4]
    type = PiecewiseLinear
    data_file = 'rp_turb4.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []
  [rp_turb5]
    type = PiecewiseLinear
    data_file = 'rp_turb5.csv'
    x_index_in_file = 0
    y_index_in_file = 1
    format = columns
    extrap = true
  []

  # turbine efficiency
  [eff_turb1]
    type = ConstantFunction
    value = ${eff_turb}
  []
  [eff_turb2]
    type = ConstantFunction
    value = ${eff_turb}
  []
  [eff_turb3]
    type = ConstantFunction
    value = ${eff_turb}
  []
  [eff_turb4]
    type = ConstantFunction
    value = ${eff_turb}
  []
  [eff_turb5]
    type = ConstantFunction
    value = ${eff_turb}
  []
[]

[Components]

  # system inlet pulling air from the open atmosphere
  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = ${p_ambient}
    T0 = ${T_ambient}
  []

  # Inlet pipe
  [pipe1]
    type = FlowChannel1Phase
    position = '${x1} ${y1} 0'
    orientation = '1 0 0'
    length = ${L1}
    n_elems = ${n_elems1}
    A = ${A1}
  []

  # Compressor as defined in MAGNET PCU document (Guillen 2020)
  [compressor]
    type = ShaftConnectedCompressor1Phase
    position = '${x2} ${y2} 0'
    inlet = 'pipe1:out'
    outlet = 'pipe2:in'
    A_ref = ${A_ref_comp}
    volume = ${V_comp}

    omega_rated = ${speed_rated}
    mdot_rated = ${rated_mfr}
    c0_rated = ${c0_rated_comp}
    rho0_rated = ${rho0_rated_comp}

    # Determines which compression ratio curve and efficiency curve to use depending on ratio of speed/rated_speed
    speeds = '0.5208 0.6250 0.7292 0.8333 0.9375'
    Rp_functions = 'rp_comp1 rp_comp2 rp_comp3 rp_comp4 rp_comp5'
    eff_functions = 'eff_comp1 eff_comp2 eff_comp3 eff_comp4 eff_comp5'

    min_pressure_ratio = 1.0

    speed_cr_I = 0
    inertia_const = ${I_comp}
    inertia_coeff = '${I_comp} 0 0 0'

    # assume no shaft friction
    speed_cr_fr = 0
    tau_fr_const = 0
    tau_fr_coeff = '0 0 0 0'

    use_scalar_variables = false
  []

  # Outlet pipe from the compressor
  [pipe2]
    type = FlowChannel1Phase
    position = '${x2} ${y2} 0'
    orientation = '1 0 0'
    length = ${L2}
    n_elems = ${n_elems2}
    A = ${A2}
  []

  # 90 degree connection between pipe 2 and 3
  [junction2_cold_leg]
    type = VolumeJunction1Phase
    connections = 'pipe2:out cold_leg:in'
    position = '${x3} ${y3} 0'
    volume = ${fparse A2*0.1}
    use_scalar_variables = false
  []

  # Cold leg of the recuperator
  [cold_leg]
    type = FlowChannel1Phase
    position = '${x3} ${y3} 0'
    orientation = '0 -1 0'
    length = ${fparse L3/2}
    n_elems = ${fparse n_elems3/2}
    A = ${A3}
  []

  # Recuperator which transfers heat from exhaust gas to reactor inlet gas to improve thermal efficency
  [recuperator]
    type = HeatStructureCylindrical
    orientation = '0 -1 0'
    position = '${x3} ${y3} 0'
    length = ${fparse L3/2}
    widths = ${recuperator_width}
    n_elems = ${fparse n_elems3/2}
    n_part_elems = 2
    names = recuperator
    solid_properties = steel
    solid_properties_T_ref = '300'
    inner_radius = ${D1}
  []
  # heat transfer from recuperator to cold leg
  [heat_transfer_cold_leg]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = cold_leg
    hs = recuperator
    hs_side = OUTER
    Hw = 10000
  []
  # heat transfer from hot leg to recuperator
  [heat_transfer_hot_leg]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = hot_leg
    hs = recuperator
    hs_side = INNER
    Hw = 10000
  []

  [junction_cold_leg_3]
    type = JunctionOneToOne1Phase
    connections = 'cold_leg:out pipe3:in'
  []
  [pipe3]
    type = FlowChannel1Phase
    position = '${x3} ${fparse y3 - (L3/2)} 0'
    orientation = '0 -1 0'
    length = ${fparse L3/2}
    n_elems = ${fparse n_elems3/2}
    A = ${A3}
  []
  # 90 degree connection between pipe 3 and 4
  [junction3_4]
    type = VolumeJunction1Phase
    connections = 'pipe3:out pipe4:in'
    position = '${x4} ${y4} 0'
    volume = ${fparse A3*0.1}
    use_scalar_variables = false
  []

  # Pipe through the "reactor core"
  [pipe4]
    type = FlowChannel1Phase
    position = '${x4} ${y4} 0'
    orientation = '-1 0 0'
    length = ${L4}
    n_elems = ${n_elems4}
    A = ${A4}
  []

  # "Reactor Core" and it's associated heat transfer to pipe 4
  [reactor]
    type = HeatStructureCylindrical
    orientation = '-1 0 0'
    position = '${x4} ${y4} 0'
    length = ${L4}
    widths = 0.15
    n_elems = ${n_elems4}
    n_part_elems = 2
    names = core
    solid_properties = steel
    solid_properties_T_ref = '300'
  []
  [total_power]
    type = TotalPower
    power = 0
  []
  [heat_generation]
    type = HeatSourceFromTotalPower
    power = total_power
    hs = reactor
    regions = core
  []
  [heat_transfer]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = pipe4
    hs = reactor
    hs_side = OUTER
    Hw = 10000
  []

  # 90 degree connection between pipe 4 and 5
  [junction4_5]
    type = VolumeJunction1Phase
    connections = 'pipe4:out pipe5:in'
    position = '${x5} ${y5} 0'
    volume = ${fparse A4*0.1}
    use_scalar_variables = false
  []

  # Pipe carrying hot gas back to the PCU
  [pipe5]
    type = FlowChannel1Phase
    position = '${x5} ${y5} 0'
    orientation = '0 1 0'
    length = ${L5}
    n_elems = ${n_elems5}
    A = ${A5}
  []

  # 90 degree connection between pipe 5 and 6
  [junction5_6]
    type = VolumeJunction1Phase
    connections = 'pipe5:out pipe6:in'
    position = '${x6} ${y6} 0'
    volume = ${fparse A5*0.1}
    use_scalar_variables = false
  []

  # Inlet pipe to the turbine
  [pipe6]
    type = FlowChannel1Phase
    position = '${x6} ${y6} 0'
    orientation = '1 0 0'
    length = ${L6}
    n_elems = ${n_elems6}
    A = ${A6}
  []

  # Turbine as defined in MAGNET PCU document (Guillen 2020) and (Wright 2006)
  [turbine]
    type = ShaftConnectedCompressor1Phase
    position = '${x7} ${y7} 0'
    inlet = 'pipe6:out'
    outlet = 'pipe7:in'
    A_ref = ${A_ref_turb}
    volume = ${V_turb}

    # A turbine is treated as an "inverse" compressor, this value determines if component is to be treated as turbine or compressor
    # If treat_as_turbine is omitted, code automatically assumes it is a compressor
    treat_as_turbine = true

    omega_rated = ${speed_rated}
    mdot_rated = ${rated_mfr}
    c0_rated = ${c0_rated_comp}
    rho0_rated = ${rho0_rated_comp}

    # Determines which compression ratio curve and efficiency curve to use depending on ratio of speed/rated_speed
    speeds = '0 0.5208 0.6250 0.7292 0.8333 0.9375'
    Rp_functions = 'rp_turb0 rp_turb1 rp_turb2 rp_turb3 rp_turb4 rp_turb5'
    eff_functions = 'eff_turb1 eff_turb1 eff_turb2 eff_turb3 eff_turb4 eff_turb5'

    min_pressure_ratio = 1.0

    speed_cr_I = 0
    inertia_const = ${I_turb}
    inertia_coeff = '${I_turb} 0 0 0'

    # assume no shaft friction
    speed_cr_fr = 0
    tau_fr_const = 0
    tau_fr_coeff = '0 0 0 0'

    use_scalar_variables = false
  []

  # Outlet pipe from turbine
  [pipe7]
    type = FlowChannel1Phase
    position = '${x7} ${y7} 0'
    orientation = '1 0 0'
    length = ${L7}
    n_elems = ${n_elems7}
    A = ${A7}
  []

  # 90 degree connection between pipe 7 and 8
  [junction7_hot_leg]
    type = VolumeJunction1Phase
    connections = 'pipe7:out hot_leg:in'
    position = '${x8} ${y8} 0'
    volume = ${fparse A7*0.1}
    use_scalar_variables = false
  []

  # Hot leg of the recuperator
  [hot_leg]
    type = FlowChannel1Phase
    position = '${x8} ${y8} 0'
    orientation = '0 1 0'
    length = ${L8}
    n_elems = ${n_elems8}
    A = ${A8}
  []

  # System outlet dumping exhaust gas to the atmosphere
  [outlet]
    type = Outlet1Phase
    input = 'hot_leg:out'
    p = ${p_ambient}
  []

  # Roatating shaft connecting motor, compressor, turbine, and generator
  [shaft]
    type = Shaft
    connected_components = 'motor compressor turbine generator'
    initial_speed = ${speed_initial}
  []

  # 3-Phase electircal motor used for system start-up, controlled by PID
  [motor]
    type = ShaftConnectedMotor
    inertia = ${I_motor}
    torque = 0 # controlled
  []

  # Electric generator supplying power to the grid
  [generator]
    type = ShaftConnectedMotor
    inertia = ${I_generator}
    torque = generator_torque_fn
  []
[]


# Control logics which govern startup of the motor, startup of the "reactor core", and shutdown of the motor
[ControlLogic]

  # Sets desired shaft speed to be reached by motor NOTE: SHOULD BE SET LOWER THAN RATED TURBINE RPM
  [set_point]
    type = GetFunctionValueControl
    function = ${fparse speed_rated_rpm - 9000}
  []

  # PID with gains determined by iterative process NOTE: Gain values are system specific
  [initial_motor_PID]
    type = PIDControl
    set_point = set_point:value
    input = shaft_RPM
    initial_value = 0
    K_p = 0.0011
    K_i = 0.00000004
    K_d = 0
  []

  # Determines when the PID system should be running and when it should begin the shutdown cycle. If needed: PID output, else: shutdown function
  [logic]
    type = ParsedFunctionControl
    function = 'if(motor+0.5 > turb, PID, shutdown_fn)'
    symbol_names = 'motor turb PID shutdown_fn'
    symbol_values = 'motor_torque turbine_torque initial_motor_PID:output motor_torque_fn_shutdown'
  []

  # Takes the output generated in [logic] and applies it to the motor torque
  [motor_PID]
    type = SetComponentRealValueControl
    component = motor
    parameter = torque
    value = logic:value
  []
  # Determines when to turn on heat source
  [power_logic]
    type = ParsedFunctionControl
    function = 'power_fn'
    symbol_names = 'power_fn'
    symbol_values = 'power_fn'
  []
  # Applies heat source to the total_power block
  [power_applied]
    type = SetComponentRealValueControl
    component = total_power
    parameter = power
    value = power_logic:value
  []
[]

[Controls]

  # Enables set_PID_tripped
  [PID_trip_status]
    type = ConditionalFunctionEnableControl
    conditional_function = is_tripped_fn
    enable_objects = 'AuxScalarKernels::PID_trip_status_aux'
    execute_on = 'TIMESTEP_END'
  []

  # Enables set_time_PID
  [time_PID]
    type = ConditionalFunctionEnableControl
    conditional_function = PID_tripped_status_fn
    disable_objects = 'AuxScalarKernels::time_trip_aux'
    execute_on = 'TIMESTEP_END'
  []
[]

[AuxVariables]

  # Creates a variable that will later be set to the time when tau_turbine > tau_motor
  [time_trip]
    order = FIRST
    family = SCALAR
  []

  # Creates variable which indicates if tau_turbine > tau_motor....... If tau_motor > tau_turbine, 0, else 1
  [PID_trip_status]
    order = FIRST
    family = SCALAR
    initial_condition = 0
  []
[]

[AuxScalarKernels]

  # Creates variable from time_fn which indicates when tau_turbine > tau_motor
  [time_trip_aux]
    type = FunctionScalarAux
    function = time_fn
    variable = time_trip
    execute_on = 'TIMESTEP_END'
  []

  # Overwrites variable PID_trip_status to the value from PID_tripped_constant_value (changes 0 to 1)
  [PID_trip_status_aux]
    type = FunctionScalarAux
    function = PID_tripped_constant_value
    variable = PID_trip_status
    execute_on = 'TIMESTEP_END'
    enable = false
  []
[]


[Postprocessors]

  # Indicates when tau_turbine > tau_motor
  [trip_time]
    type = ScalarVariable
    variable = time_trip
    execute_on = 'TIMESTEP_END'
  []

  ##########################
  # Motor
  ##########################

  [motor_torque]
    type = RealComponentParameterValuePostprocessor
    component = motor
    parameter = torque
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [motor_power]
    type = FunctionValuePostprocessor
    function = motor_power_fn
    execute_on = 'INITIAL TIMESTEP_END'
  []

  ##########################
  # generator
  ##########################

  [generator_torque]
    type = ShaftConnectedComponentPostprocessor
    quantity = torque
    shaft_connected_component_uo = generator:shaftconnected_uo
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [generator_power]
    type = FunctionValuePostprocessor
    function = generator_power_fn
    execute_on = 'INITIAL TIMESTEP_END'
  []

  ##########################
  # Shaft
  ##########################

  # Speed in rad/s
  [shaft_speed]
    type = ScalarVariable
    variable = 'shaft:omega'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  # speed in RPM
  [shaft_RPM]
    type = ParsedPostprocessor
    pp_names = 'shaft_speed'
    expression = '(shaft_speed * 60) /( 2 * ${fparse pi})'
    execute_on = 'INITIAL TIMESTEP_END'
  []

  ##########################
  # Compressor
  ##########################
  [comp_dissipation_torque]
    type = ElementAverageValue
    variable = dissipation_torque
    block = 'compressor'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [comp_isentropic_torque]
    type = ElementAverageValue
    variable = isentropic_torque
    block = 'compressor'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [comp_friction_torque]
    type = ElementAverageValue
    variable = friction_torque
    block = 'compressor'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [compressor_torque]
    type = ParsedPostprocessor
    pp_names = 'comp_dissipation_torque comp_isentropic_torque comp_friction_torque'
    expression = 'comp_dissipation_torque + comp_isentropic_torque + comp_friction_torque'
  []
  [p_in_comp]
    type = PointValue
    variable = p
    point = '${x1_out} ${y1} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_out_comp]
    type = PointValue
    variable = p
    point = '${x2_in} ${y2} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_ratio_comp]
    type = ParsedPostprocessor
    pp_names = 'p_in_comp p_out_comp'
    expression = 'p_out_comp / p_in_comp'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [T_in_comp]
    type = PointValue
    variable = T
    point = '${x1_out} ${y1} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [T_out_comp]
    type = PointValue
    variable = T
    point = '${x2_in} ${y2} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [T_ratio_comp]
    type = ParsedPostprocessor
    pp_names = 'T_in_comp T_out_comp'
    expression = '(T_out_comp - T_in_comp) / T_out_comp'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [mfr_comp]
    type = ADFlowJunctionFlux1Phase
    boundary = pipe1:out
    connection_index = 0
    equation = mass
    junction = compressor
  []

  ##########################
  # turbine
  ##########################

  [turb_dissipation_torque]
    type = ElementAverageValue
    variable = dissipation_torque
    block = 'turbine'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [turb_isentropic_torque]
    type = ElementAverageValue
    variable = isentropic_torque
    block = 'turbine'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [turb_friction_torque]
    type = ElementAverageValue
    variable = friction_torque
    block = 'turbine'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [turbine_torque]
    type = ParsedPostprocessor
    pp_names = 'turb_dissipation_torque turb_isentropic_torque turb_friction_torque'
    expression = 'turb_dissipation_torque + turb_isentropic_torque + turb_friction_torque'
  []
  [p_in_turb]
    type = PointValue
    variable = p
    point = '${x6_out} ${y6} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_out_turb]
    type = PointValue
    variable = p
    point = '${x7_in} ${y7} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [p_ratio_turb]
    type = ParsedPostprocessor
    pp_names = 'p_in_turb p_out_turb'
    expression = 'p_in_turb / p_out_turb'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [T_in_turb]
    type = PointValue
    variable = T
    point = '${x6_out} ${y6} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [T_out_turb]
    type = PointValue
    variable = T
    point = '${x7_in} ${y7} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [mfr_turb]
    type = ADFlowJunctionFlux1Phase
    boundary = pipe6:out
    connection_index = 0
    equation = mass
    junction = turbine
  []

  ##########################
  # Recuperator
  ##########################

  [cold_leg_in]
    type = PointValue
    variable = T
    point = '${x3} ${cold_leg_in} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [cold_leg_out]
    type = PointValue
    variable = T
    point = '${x3} ${cold_leg_out} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [hot_leg_in]
    type = PointValue
    variable = T
    point = '${x8} ${hot_leg_in} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [hot_leg_out]
    type = PointValue
    variable = T
    point = '${x8} ${hot_leg_out} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []

  ##########################
  # Reactor
  ##########################

  [reactor_inlet]
    type = PointValue
    variable = T
    point = '${x4} ${y4} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
  [reactor_outlet]
    type = PointValue
    variable = T
    point = '${x5} ${y5_in} 0'
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  end_time = ${t3}
  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 0.01
    growth_factor = 1.1
    cutback_factor = 0.9
  []
  dtmin = 1e-5
  dtmax = 1000
  steady_state_detection = true
  steady_state_start_time = 200000

  solve_type = NEWTON
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 15

  l_tol = 1e-4
  l_max_its = 10

  petsc_options_iname  = '-pc_type'
  petsc_options_value  = ' lu     '
[]

[Outputs]
  [e]
    type = Exodus
    file_base = 'recuperated_brayton_cycle_out'
  []
  [csv]
    type = CSV
    file_base = 'recuperated_brayton_cycle'
    execute_vector_postprocessors_on = 'INITIAL'
  []
  [console]
    type = Console
    show = 'shaft_speed p_ratio_comp p_ratio_turb pressure_ratio pressure_ratio'
  []
[]

(modules/thermal_hydraulics/test/tests/components/simple_turbine_1phase/phy.test.i)

[GlobalParams]
  initial_p = 1e6
  initial_T = 517
  initial_vel = 1.0
  initial_vel_x = 1
  initial_vel_y = 0
  initial_vel_z = 0

  fp = fp

  closures = simple_closures
  f = 0

  gravity_vector = '0 0 0'
[]

[FluidProperties]
  [fp]
    type = IdealGasFluidProperties
    gamma = 1.4
    molar_mass = 0.01
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe1:in'
    m_dot = 10
    T = 517
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 1
  []

  [turbine]
    type = SimpleTurbine1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1 0 0'
    volume = 1
    on = true
    power = 1000
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1. 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 1
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e6
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2

  start_time = 0
  dt = 1
  num_steps = 10

  abort_on_solve_fail = true

  solve_type = 'newton'
  line_search = 'basic'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'

  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-5

  nl_max_its = 5
  l_tol = 1e-4
[]

[Outputs]
  exodus = true
  show = 'p T vel'
  velocity_as_vector = false
  time_step_interval = 5
[]

(modules/thermal_hydraulics/test/tests/closures/THM_1phase/thm1phase.i)

D = 0.1
A = '${fparse (1./4.)*pi*D^2}'
P_hf = '${fparse pi*D}'
D_h = '${fparse 4*A/P_hf}'
mdot = 0.04
file_base = 'db_churchill'

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_vel = 0.003
  initial_p = 1e5
  initial_T = 300

  D_h = ${D_h}
  A = ${A}
  P_hf = ${P_hf}

  m_dot = ${mdot}

  closures = thm
  execute_on = 'initial timestep_begin'
[]

[FluidProperties]
  [water]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.56361
    mu = 8.84e-05
  []
[]

[Closures]
  [thm]
    type = Closures1PhaseTHM
    wall_htc_closure = dittus_boelter
    wall_ff_closure = churchill
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = water
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
  []

  #--------------Pipe BCs-------------#
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    T = 300
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
  [ht]
    type = HeatTransferFromSpecifiedTemperature1Phase
    flow_channel = 'pipe'
    T_wall = 500
  []

[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1e-5
[]

[Postprocessors]

  [Hw]
    type = ADElementAverageMaterialProperty
    mat_prop = Hw
  []
  [f]
    type = ADElementAverageMaterialProperty
    mat_prop = f_D
    block = pipe
  []
[]

[Outputs]
  csv = true
  file_base = ${file_base}
[]

(modules/thermal_hydraulics/test/tests/components/volume_junction_1phase/phy.unequal_area.i)

# Junction between 2 pipes where the second has half the area of the first.
# The momentum density of the second should be twice that of the first.

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 250
  initial_p = 1e5
  initial_vel = 1
  initial_vel_x = 1
  initial_vel_y = 0
  initial_vel_z = 0

  f = 0

  fp = eos

  scaling_factor_1phase = '1 1 1e-5'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    p_inf = 0
    q = 0
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet]
    type = InletDensityVelocity1Phase
    input = 'pipe1:in'
    rho = 1.37931034483
    vel = 1
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    A = 1
    n_elems = 20
  []

  [junction]
    type = VolumeJunction1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1 0 0'
    volume = 1e-8
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1 0 0'
    orientation = '1 0 0'
    length = 1
    A = 0.5
    n_elems = 20
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-10
  l_max_its = 10

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  start_time = 0
  end_time = 3
  dt = 0.1

  abort_on_solve_fail = true
[]

[Postprocessors]
  # These post-processors are used to test that the outlet side of the junction,
  # which has half the area of the inlet side, has twice the momentum density
  # that the inlet side does.
  [rhouA_pipe1]
    type = SideAverageValue
    variable = rhouA
    boundary = pipe1:out
  []
  [rhouA_pipe2]
    type = SideAverageValue
    variable = rhouA
    boundary = pipe2:out
  []
  [test_rel_err]
    type = RelativeDifferencePostprocessor
    value1 = rhouA_pipe1
    value2 = rhouA_pipe2
  []
[]

[Outputs]
  [out]
    type = CSV
    show = test_rel_err
    execute_on = 'final'
  []
[]

(modules/thermal_hydraulics/test/tests/components/volume_junction_1phase/junction_with_calorifically_imperfect_gas.i)

# This input file tests compatibility of VolumeJunction1Phase and CaloricallyImperfectGas.
# Loss coefficient is applied in first junction.
# Expected pressure drop ~0.5*K*rho_in*vel_in^2=0.5*100*3.219603*1 = 160.9 Pa

T_in = 523.0
vel = 1
p_out = 7e6

[GlobalParams]
  initial_p = ${p_out}
  initial_vel = ${vel}
  initial_T = ${T_in}
  gravity_vector = '0 0 0'
  closures = simple_closures
  n_elems = 3
  f = 0
  scaling_factor_1phase = '1 1 1e-5'
  scaling_factor_rhoV = '1e2'
  scaling_factor_rhowV = '1e-2'
  scaling_factor_rhoEV = '1e-5'
[]

[Functions]
  [e_fn]
    type = PiecewiseLinear
    x = '100   280 300 350 400 450 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 5000'
    y = '783.9 2742.3 2958.6 3489.2 4012.7 4533.3 5053.8 5574 6095.1 7140.2 8192.9 9256.3 10333.6 12543.9 14836.6 17216.3 19688.4 22273.7 25018.3 28042.3 31544.2 35818.1 41256.5 100756.5'
    scale_factor = 1e3
  []

  [mu_fn]
    type = PiecewiseLinear
    x = '100   280 300 350 400 450 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 5000'
    y = '85.42 85.42 89.53 99.44 108.9 117.98 126.73 135.2 143.43 159.25 174.36 188.9 202.96 229.88 255.5 280.05 303.67 326.45 344.97 366.49 387.87 409.48 431.86 431.86'
    scale_factor = 1e-7
  []

  [k_fn]
    type = PiecewiseLinear
    x = '100 280 300 350 400 450 500 550 600 700 800 900 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 5000'
    y = '186.82 186.82 194.11 212.69 231.55 250.38 268.95 287.19 305.11 340.24 374.92 409.66 444.75 511.13 583.42 656.44 733.32 826.53 961.15 1180.38 1546.31 2135.49 3028.08 3028.08'
    scale_factor = 1e-3
  []
[]

[FluidProperties]
  [fp]
    type = CaloricallyImperfectGas
    molar_mass = 0.002
    e = e_fn
    k = k_fn
    mu = mu_fn
    min_temperature = 100
    max_temperature = 5000
    out_of_bound_error = false
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet_bc]
    type = InletVelocityTemperature1Phase
    input = 'inlet:in'
    vel = ${vel}
    T = ${T_in}
  []
  [inlet]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 11'
    orientation = '0 0 -1'
    length = 1
    A = 5
  []
  [inlet_plenum]
    type = VolumeJunction1Phase
    position = '0 0 10'
    initial_vel_x = 0
    initial_vel_y = 0
    initial_vel_z = ${vel}
    K = 100
    connections = 'inlet:out channel1:in channel2:in'
    volume = 1
    use_scalar_variables = false
  []
  [channel1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 10'
    orientation = '0 0 -1'
    length = 10
    A = 4
    D_h = 1
  []
  [channel2]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 10'
    orientation = '0 0 -1'
    length = 10
    A = 1
    D_h = 1
  []
  [outlet_plenum]
    type = VolumeJunction1Phase
    position = '0 0 0'
    initial_vel_x = 0
    initial_vel_y = 0
    initial_vel_z = ${vel}
    connections = 'channel1:out channel2:out outlet:in'
    volume = 1
    use_scalar_variables = false
  []
  [outlet]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '0 0 -1'
    length = 1
    A = 5
  []
  [outlet_bc]
    type = Outlet1Phase
    p = ${p_out}
    input = 'outlet:out'
  []
[]

[Postprocessors]
  [p_in]
    type = SideAverageValue
    variable = p
    boundary = inlet:in
  []
  [p_out]
    type = SideAverageValue
    variable = p
    boundary = outlet:out
  []
  [Delta_p]
    type = DifferencePostprocessor
    value1 = p_out
    value2 = p_in
  []
  [inlet_in_m_dot]
    type = ADFlowBoundaryFlux1Phase
    boundary = 'inlet_bc'
    equation = mass
  []
  [inlet_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'inlet:out'
    connection_index = 0
    junction = inlet_plenum
    equation = mass
  []

  [channel1_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel1:in'
    connection_index = 1
    junction = inlet_plenum
    equation = mass
  []
  [channel1_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel1:out'
    connection_index = 0
    junction = outlet_plenum
    equation = mass
  []

  [channel2_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel2:in'
    connection_index = 2
    junction = inlet_plenum
    equation = mass
  []
  [channel2_out_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'channel2:out'
    connection_index = 1
    junction = outlet_plenum
    equation = mass
  []

  [outlet_in_m_dot]
    type = ADFlowJunctionFlux1Phase
    boundary = 'outlet:in'
    connection_index = 2
    junction = outlet_plenum
    equation = mass
  []
  [outlet_out_m_dot]
    type = ADFlowBoundaryFlux1Phase
    boundary = 'outlet_bc'
    equation = mass
  []

  [net_mass_flow_rate_domain]
    type = LinearCombinationPostprocessor
    pp_names = 'inlet_in_m_dot outlet_out_m_dot'
    pp_coefs = '1 -1'
  []
  [net_mass_flow_rate_volume_junction]
    type = LinearCombinationPostprocessor
    pp_names = 'inlet_out_m_dot channel1_in_m_dot channel2_in_m_dot'
    pp_coefs = '1 -1 -1'
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2
  start_time = 0
  end_time = 20
  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 1
    optimal_iterations = 8
    iteration_window = 2
  []
  timestep_tolerance = 1e-6
  abort_on_solve_fail = true

  line_search = basic
  nl_rel_tol = 1e-8
  nl_abs_tol = 4e-8
  nl_max_its = 25
  l_tol = 1e-3
  l_max_its = 5
  petsc_options = '-snes_converged_reason'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu     '
[]

[Outputs]
  [out]
    type = CSV
    execute_on = 'FINAL'
    show = 'net_mass_flow_rate_domain net_mass_flow_rate_volume_junction Delta_p'
  []
[]

(modules/thermal_hydraulics/test/tests/components/inlet_stagnation_p_t_1phase/clg.ctrl_p0_3eqn.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_T = 300
  initial_vel = 0.0

  scaling_factor_1phase = '1 1 1e-5'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 50

    A   = 1.0000000000e-04
    D_h = 1.1283791671e-02

    f = 0.0

    fp = fp
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 1e5
    T0 = 300
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 1e5
  []
[]

[Functions]
  [inlet_p0_fn]
    type = PiecewiseLinear
    x = '0   1'
    y = '1e5 1.001e5'
  []
[]

[ControlLogic]
  [set_inlet_value]
    type = TimeFunctionComponentControl
    component = inlet
    parameter = p0
    function = inlet_p0_fn
  []
[]

[Postprocessors]
  [inlet_p0]
    type = RealComponentParameterValuePostprocessor
    component = inlet
    parameter = p0
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0.0
  dt = 0.25
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'

  nl_rel_tol = 1e-5
  nl_abs_tol = 1e-6
  nl_max_its = 30

  l_tol = 1e-3
  l_max_its = 100

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/simple_turbine_1phase/clg.test.i)

[GlobalParams]
  initial_p = 1e6
  initial_T = 517
  initial_vel = 1.0
  initial_vel_x = 1
  initial_vel_y = 0
  initial_vel_z = 0

  f = 0
  fp = fp
  closures = simple_closures
  gravity_vector = '0 0 0'

  automatic_scaling = true
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.43
    cv = 1040.0
    q = 2.03e6
    p_inf = 0.0
    q_prime = -2.3e4
    k = 0.026
    mu = 134.4e-7
    M = 0.01801488
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [W_dot_fn]
    type = PiecewiseLinear
    xy_data = '
      0 0
      1 10'
  []
[]

[Components]
  [inlet]
    type = InletVelocityTemperature1Phase
    input = 'pipe1:in'
    vel = 1
    T = 517
  []

  [pipe1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 1
  []

  [turbine]
    type = SimpleTurbine1Phase
    connections = 'pipe1:out pipe2:in'
    position = '1 0 0'
    volume = 1
    A_ref = 1.0
    K = 0
    on = true
    power = 0
    use_scalar_variables = false
  []

  [pipe2]
    type = FlowChannel1Phase
    position = '1. 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = 1
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe2:out'
    p = 1e6
  []
[]

[ControlLogic]
  [W_dot_ctrl]
    type = TimeFunctionComponentControl
    component = turbine
    parameter = power
    function = W_dot_fn
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = bdf2

  start_time = 0
  dt = 0.1
  num_steps = 10

  solve_type = 'newton'
  line_search = 'basic'
  petsc_options_iname = '-pc_type'
  petsc_options_value = ' lu'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-3
  nl_max_its = 5
  l_tol = 1e-4

  abort_on_solve_fail = true
[]

[Postprocessors]
  [turbine_power]
    type = ElementAverageValue
    variable = W_dot
    block = 'turbine'
  []
[]

[Outputs]
  [csv]
    type = CSV
    show = 'turbine_power'
  []
[]

(modules/thermal_hydraulics/tutorials/single_phase_flow/03_upper_loop.i)

T_in = 300. # K
m_dot_in = 1e-2 # kg/s
press = 10e5 # Pa

# core parameters
core_length = 1. # m
core_n_elems = 25
core_dia = '${units 2. cm -> m}'
core_pitch = '${units 8.7 cm -> m}'
A_core = '${fparse core_pitch^2 - 0.25 *pi * core_dia^2}'
P_wet_core = '${fparse 4*core_pitch + pi * core_dia}'
Dh_core = '${fparse 4 * A_core / P_wet_core}'

# pipe parameters
pipe_dia = '${units 10. cm -> m}'
A_pipe = '${fparse 0.25 * pi * pipe_dia^2}'

tot_power = 2000 # W

[GlobalParams]
  initial_p = ${press}
  initial_vel = 0.0001
  initial_T = ${T_in}
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0
  gravity_vector = '0 0 0'

  rdg_slope_reconstruction = minmod
  scaling_factor_1phase = '1 1e-2 1e-4'
  scaling_factor_rhoV = 1
  scaling_factor_rhouV = 1e-2
  scaling_factor_rhovV = 1e-2
  scaling_factor_rhowV = 1e-2
  scaling_factor_rhoEV = 1e-4
  closures = thm_closures
  fp = he
[]

[FluidProperties]
  [he]
    type = IdealGasFluidProperties
    molar_mass = 4e-3
    gamma = 1.67
    k = 0.2556
    mu = 3.22639e-5
  []
[]

[Closures]
  [thm_closures]
    type = Closures1PhaseTHM
  []
[]

[SolidProperties]
  [steel]
    type = ThermalFunctionSolidProperties
    rho = 8050
    k = 45
    cp = 466
  []
[]

[Components]
  [total_power]
    type = TotalPower
    power = ${tot_power}
  []
  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'up_pipe_1:in'
    m_dot = ${m_dot_in}
    T = ${T_in}
  []

  [up_pipe_1]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    length = 0.5
    n_elems = 15
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct1]
    type = JunctionParallelChannels1Phase
    position = '0 0 0.5'
    connections = 'up_pipe_1:out core_chan:in'
    volume = 1e-5
    use_scalar_variables = false
  []
  [core_chan]
    type = FlowChannel1Phase
    position = '0 0 0.5'
    orientation = '0 0 1'
    length = ${core_length}
    n_elems = ${core_n_elems}
    roughness = .0001
    A = '${A_core}'
    D_h = ${Dh_core}
  []

  [core_hs]
    type = HeatStructureCylindrical
    position = '0 0 0.5'
    orientation = '0 0 1'
    length = ${core_length}
    n_elems = ${core_n_elems}
    names = 'block'
    widths = '${fparse core_dia / 2.}'
    solid_properties = 'steel'
    solid_properties_T_ref = '300'
    n_part_elems = 3
  []

  [core_heating]
    type = HeatSourceFromTotalPower
    hs = core_hs
    regions = block
    power = total_power
  []

  [core_ht]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = core_chan
    hs = core_hs
    hs_side = outer
    P_hf = '${fparse pi * core_dia}'
  []

  [jct2]
    type = JunctionParallelChannels1Phase
    position = '0 0 1.5'
    connections = 'core_chan:out up_pipe_2:in'
    volume = 1e-5
    use_scalar_variables = false
  []

  [up_pipe_2]
    type = FlowChannel1Phase
    position = '0 0 1.5'
    orientation = '0 0 1'
    length = 0.5
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct3]
    type = JunctionOneToOne1Phase
    connections = 'up_pipe_2:out top_pipe:in'
  []

  [top_pipe]
    type = FlowChannel1Phase
    position = '0 0 2'
    orientation = '1 0 0'
    length = 1
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [jct4]
    type = JunctionOneToOne1Phase
    connections = 'top_pipe:out down_pipe_1:in'
  []

  [down_pipe_1]
    type = FlowChannel1Phase
    position = '1 0 2'
    orientation = '0 0 -1'
    length = 0.25
    A = ${A_pipe}
    n_elems = 5
  []

  [jct5]
    type = JunctionOneToOne1Phase
    connections = 'down_pipe_1:out cooling_pipe:in'
  []

  [cooling_pipe]
    type = FlowChannel1Phase
    position = '1 0 1.75'
    orientation = '0 0 -1'
    length = 1.5
    n_elems = 25
    A = ${A_pipe}
  []

  [cold_wall]
    type = HeatTransferFromSpecifiedTemperature1Phase
    flow_channel = cooling_pipe
    T_wall = 300
    P_hf = '${fparse pi * pipe_dia}'
  []

  [jct6]
    type = JunctionOneToOne1Phase
    connections = 'cooling_pipe:out down_pipe_2:in'
  []

  [down_pipe_2]
    type = FlowChannel1Phase
    position = '1 0 0.25'
    orientation = '0 0 -1'
    length = 0.25
    n_elems = 10
    A = ${A_pipe}
    D_h = ${pipe_dia}
  []

  [outlet]
    type = Outlet1Phase
    input = 'down_pipe_2:out'
    p = ${press}
  []
[]

[Postprocessors]
  [power_to_coolant]
    type = ADHeatRateConvection1Phase
    block = core_chan
    P_hf = '${fparse pi *core_dia}'
  []

  [core_T_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = T
  []

  [core_p_in]
    type = SideAverageValue
    boundary = core_chan:in
    variable = p
  []

  [core_p_out]
    type = SideAverageValue
    boundary = core_chan:out
    variable = p
  []

  [core_delta_p]
    type = ParsedPostprocessor
    pp_names = 'core_p_in core_p_out'
    expression = 'core_p_in - core_p_out'
  []

  [hx_pri_T_out]
    type = SideAverageValue
    boundary = cooling_pipe:out
    variable = T
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  start_time = 0

  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 1
  []
  end_time = 500

  line_search = basic
  solve_type = NEWTON

  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'

  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 25

[]

[Outputs]
  exodus = true

  [console]
    type = Console
    max_rows = 1
    outlier_variable_norms = false
  []
  print_linear_residuals = false
[]

(modules/thermal_hydraulics/test/tests/controls/copy_postprocessor_value_control/test.i)

# This is testing that the values copied by CopyPostprocessorValueControl are used.
# A postprocessor T_pt samples value at point (0, 0, 0), those values are then
# read in by CopyPostprocessorValueControl and then we output this value. The values
# are lagged by one time step, because controls are executed at the beginning
# of the time step and postprocessors at the end of the time step. Note that
# CopyPostprocessorValueControl is added when a postprocessor is created. That's why
# you do not see the object in this input file.

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 15.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 100.e3
    T0 = 340.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[Postprocessors]
  [T_pt]
    type = SideAverageValue
    boundary = pipe1:in
    variable = T
    execute_on = 'initial timestep_end'
  []

  [T_ctrl]
    type = RealControlDataValuePostprocessor
    control_data_name = T_pt
    execute_on = timestep_end
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  start_time = 0
  dt = 1e-5
  num_steps = 3
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5
[]

[Outputs]
  csv = true
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_heat_structure_1phase/err.not_a_hs.i)

[GlobalParams]
  initial_p = 15.5e6
  initial_vel = 2
  initial_T = 560

  scaling_factor_1phase = '1 1 1'
  scaling_factor_temperature = '1'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    length = 3.865
    n_elems = 1

    A = 8.78882e-5
    D_h = 0.01179
    f = 0.01

    fp = fp
  []

  [hx]
    type = HeatTransferFromHeatStructure1Phase
    hs = inlet # wrong
    hs_side = outer
    flow_channel = pipe
    Hw = 5.33e4
    P_hf = 0.029832559676
  []

  [hx2]
    type = HeatTransferFromHeatStructure1Phase
    hs = asdf # wrong
    hs_side = outer
    flow_channel = pipe
    Hw = 5.33e4
    P_hf = 0.029832559676
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 15.5e6
    T0 = 560
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 15e6
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  dt = 1.e-2
  dtmin = 1.e-2

  solve_type = 'NEWTON'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 1

  l_tol = 1e-3
  l_max_its = 30

  start_time = 0.0
  num_steps = 20
[]

(modules/thermal_hydraulics/test/tests/components/heat_transfer_from_heat_structure_1phase/phy.energy_heatstructure_ss_1phase.i)

# This test tests conservation of energy at steady state for 1-phase flow when a
# heat structure is used. Conservation is checked by comparing the integral of
# the heat flux against the difference of the boundary fluxes.

[GlobalParams]
  initial_p = 7.0e6
  initial_vel = 0
  initial_T = 513

  gravity_vector = '0.0 0.0 0.0'

  scaling_factor_1phase = '1 1 1e-4'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[SolidProperties]
  [fuel-mat]
    type = ThermalFunctionSolidProperties
    k = 3.7
    cp = 3.e2
    rho = 10.42e3
  []
  [gap-mat]
    type = ThermalFunctionSolidProperties
    k = 0.7
    cp = 5e3
    rho = 1.0
  []
  [clad-mat]
    type = ThermalFunctionSolidProperties
    k = 16
    cp = 356.
    rho = 6.551400E+03
  []
[]

[Components]
  [reactor]
    type = TotalPower
    power = 1e3
  []

  [core:pipe]
    type = FlowChannel1Phase
    position = '0 0 0'
    orientation = '0 0 1'
    length = 3.66
    n_elems = 10

    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.0

    fp = eos
  []

  [core:solid]
    type = HeatStructureCylindrical
    position = '0 -0.0071501 0'
    orientation = '0 0 1'
    length = 3.66
    n_elems = 10

    names =  'FUEL GAP CLAD'
    widths = '6.057900E-03  1.524000E-04  9.398000E-04'
    n_part_elems = '5 1 2'
    solid_properties = 'fuel-mat gap-mat clad-mat'
    solid_properties_T_ref = '300 300 300'

    initial_T = 513
  []

  [core:hgen]
    type = HeatSourceFromTotalPower
    hs = core:solid
    regions = 'FUEL'
    power = reactor
    power_fraction = 1
  []

  [core:hx]
    type = HeatTransferFromHeatStructure1Phase
    flow_channel = core:pipe
    hs   = core:solid
    hs_side = outer
    Hw = 1.0e4
    P_hf = 4.4925e-2
  []

  [inlet]
    type = InletDensityVelocity1Phase
    input = 'core:pipe:in'
    rho = 817.382210128610836
    vel = 2.4
  []

  [outlet]
    type = Outlet1Phase
    input = 'core:pipe:out'
    p = 7e6
  []
[]

[Postprocessors]
  [E_in]
    type = ADFlowBoundaryFlux1Phase
    boundary = inlet
    equation = energy
    execute_on = 'initial timestep_end'
  []

  [E_out]
    type = ADFlowBoundaryFlux1Phase
    boundary = outlet
    equation = energy
    execute_on = 'initial timestep_end'
  []

  [hf_pipe]
    type = ADHeatRateConvection1Phase
    block = core:pipe
    T_wall = T_wall
    T = T
    Hw = Hw
    P_hf = P_hf
    execute_on = 'initial timestep_end'
  []

  [E_diff]
    type = DifferencePostprocessor
    value1 = E_in
    value2 = E_out
    execute_on = 'initial timestep_end'
  []

  [E_conservation]
    type = SumPostprocessor
    values = 'E_diff hf_pipe'
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  abort_on_solve_fail = true
  dt = 5

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-8
  nl_max_its = 50

  l_tol = 1e-3
  l_max_its = 60

  start_time = 0
  end_time = 260
[]

[Outputs]
  [out]
    type = CSV
    execute_on = final
    show = 'E_conservation'
  []
  [console]
    type = Console
    show = 'E_conservation'
  []
[]

(modules/thermal_hydraulics/test/tests/components/volume_junction_1phase/phy.shower.i)

# This problem models a "shower": water from two pipes, one hot and one cold,
# mixes together to produce a temperature between the two.

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_T = 300
  initial_p = 1e5
  initial_vel = 0
  initial_vel_x = 0
  initial_vel_y = 0
  initial_vel_z = 0

  # global parameters for pipes
  fp = eos
  orientation = '1 0 0'
  length = 1
  n_elems = 20
  f = 0

  scaling_factor_1phase = '1 1 1e-6'

  closures = simple_closures
[]

[FluidProperties]
  [eos]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [inlet_hot]
    type = InletDensityVelocity1Phase
    input = 'pipe_hot:in'
    # rho @ (p = 1e5, T = 310 K)
    rho = 1315.9279785683
    vel = 1
  []
  [inlet_cold]
    type = InletDensityVelocity1Phase
    input = 'pipe_cold:in'
    # rho @ (p = 1e5, T = 280 K)
    rho = 1456.9202619863
    vel = 1
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe_warm:out'
    p = 1e5
  []

  [pipe_hot]
    type = FlowChannel1Phase
    position = '0 1 0'
    A = 1
  []
  [pipe_cold]
    type = FlowChannel1Phase
    position = '0 0 0'
    A = 1
  []
  [pipe_warm]
    type = FlowChannel1Phase
    position = '1 0.5 0'
    A = 2
  []

  [junction]
    type = VolumeJunction1Phase
    connections = 'pipe_cold:out pipe_hot:out pipe_warm:in'
    position = '1 0.5 0'
    volume = 1e-8
    use_scalar_variables = false
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-5
  nl_max_its = 10

  l_tol = 1e-2
  l_max_its = 10

  start_time = 0
  end_time = 5
  dt = 0.05

  # abort_on_solve_fail = true
[]

[Postprocessors]
  # These post-processors are used to test that the energy flux on
  # the warm side of the junction is equal to the sum of the energy
  # fluxes of the hot and cold inlets to the junction.
  [energy_flux_hot]
    type = EnergyFluxIntegral
    boundary = pipe_hot:out
    arhouA = rhouA
    H = H
  []
  [energy_flux_cold]
    type = EnergyFluxIntegral
    boundary = pipe_cold:out
    arhouA = rhouA
    H = H
  []
  [energy_flux_warm]
    type = EnergyFluxIntegral
    boundary = pipe_warm:in
    arhouA = rhouA
    H = H
  []
  [energy_flux_inlet_sum]
    type = SumPostprocessor
    values = 'energy_flux_hot energy_flux_cold'
  []
  [test_rel_err]
    type = RelativeDifferencePostprocessor
    value1 = energy_flux_warm
    value2 = energy_flux_inlet_sum
  []
[]

[Outputs]
  [out]
    type = CSV
    show = test_rel_err
    sync_only = true
    sync_times = '3 4 5'
  []
  [console]
    type = Console
    max_rows = 1
  []
  print_linear_residuals = false
[]

(modules/thermal_hydraulics/test/tests/misc/initial_from_file/flow_channel/test.i)

# Test that the initial conditions read from the exodus file are correct

[GlobalParams]
  scaling_factor_1phase = '1. 1.e-2 1.e-4'

  closures = simple_closures

  initial_from_file = 'steady_state_out.e'
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
    k = 0.5
    mu = 281.8e-6
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = fp
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    length = 1
    n_elems = 3
    A = 1.907720E-04
    D_h = 1.698566E-02
    f = 0.1
  []

  [inlet]
    type = InletMassFlowRateTemperature1Phase
    input = 'pipe:in'
    m_dot = 0.1
    T = 500
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 6e6
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  start_time = 0
  dt = 1
  num_steps = 1
  abort_on_solve_fail = true

  solve_type = 'NEWTON'
  line_search = 'basic'
  nl_rel_tol = 1e-7
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 100
[]

[Outputs]
  exodus = true
  execute_on = 'initial'
  velocity_as_vector = false
[]

(modules/thermal_hydraulics/test/tests/controls/error_checking/non_existent_control_data.i)

# This test makes sure that we error out when a control object requests a data
# that were not declared

[GlobalParams]
  initial_p = 100.e3
  initial_vel = 1.0
  initial_T = 350.
  scaling_factor_1phase = '1 1e-2 1e-4'
  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    q = -1167e3
    q_prime = 0
    p_inf = 1.e9
    cv = 1816
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe1]
    type = FlowChannel1Phase
    fp = fp
    position = '0 0 0'
    orientation = '1 0 0'
    length = 15.0
    n_elems = 10
    A    = 0.01
    D_h  = 0.1
    f = 0.01
  []

  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    p0 = 105.e3
    T0 = 300.
  []
  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 100.0e3
  []
[]

[ControlLogic]
  [set_inlet_value]
    type = SetComponentRealValueControl
    component = inlet
    parameter = T0
    value = wrong         # this does not exist
  []
[]

[Preconditioning]
  [SMP_PJFNK]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  start_time = 0
  dt = 0.5
  num_steps = 1
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-6
  nl_max_its = 20

  l_tol = 1e-3
  l_max_its = 5
[]

(modules/thermal_hydraulics/test/tests/components/junction_parallel_channels_1phase/equal_area_no_junction.i)

# Tests a junction between 2 flow channels of equal area and orientation. A
# sinusoidal density shape is advected to the right and should not be affected
# by the junction; the solution should be identical to the equivalent
# no-junction solution.
#
# This input file has no junction and is used for comparison to the results with
# a junction.

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_p = 1e5
  initial_vel = 1

  A = 25

  f = 0

  fp = fp

  scaling_factor_1phase = '0.04 0.04 0.04e-5'

  closures = simple_closures
[]

[FluidProperties]
  [fp]
    type = StiffenedGasFluidProperties
    gamma = 1.4
    cv = 725
    p_inf = 0
    q = 0
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Functions]
  [T0]
    type = CosineHumpFunction
    axis = x
    hump_center_position = 1
    hump_width = 0.5
    hump_begin_value = 250
    hump_center_value = 300
  []
[]

[Components]
  [inlet]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe1:in'
    # Stagnation property with p = 1e5 Pa, T = 250 K, vel = 1 m/s
    p0 = 100000.68965687
    T0 = 250.00049261084
  []

  [pipe1]
    type = FlowChannel1Phase

    position = '0 0 0'
    orientation = '1 0 0'
    length = 2

    initial_T = T0

    n_elems = 50
  []

  [outlet]
    type = Outlet1Phase
    input = 'pipe1:out'
    p = 1e5
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient

  scheme = 'bdf2'
  start_time = 0
  dt = 0.01
  num_steps = 5
  abort_on_solve_fail = true

  solve_type = 'PJFNK'
  line_search = 'basic'
  nl_rel_tol = 0
  nl_abs_tol = 1e-6
  nl_max_its = 10

  l_tol = 1e-3
  l_max_its = 10

  [Quadrature]
    type = GAUSS
    order = SECOND
  []
[]

[Postprocessors]
  [junction_rhoA]
    type = PointValue
    variable = rhoA
    point = '1.02 0 0'
    execute_on = 'initial timestep_end'
  []
  [junction_rhouA]
    type = PointValue
    variable = rhouA
    point = '1.02 0 0'
    execute_on = 'initial timestep_end'
  []
  [junction_rhoEA]
    type = PointValue
    variable = rhoEA
    point = '1.02 0 0'
    execute_on = 'initial timestep_end'
  []
  [junction_rho]
    type = ScalePostprocessor
    value = junction_rhoA
    scaling_factor = 0.04
    execute_on = 'initial timestep_end'
  []
  [junction_rhou]
    type = ScalePostprocessor
    value = junction_rhouA
    scaling_factor = 0.04
    execute_on = 'initial timestep_end'
  []
  [junction_rhoE]
    type = ScalePostprocessor
    value = junction_rhoEA
    scaling_factor = 0.04
    execute_on = 'initial timestep_end'
  []
[]

[Outputs]
  [out]
    type = CSV
    show = 'junction_rho junction_rhou junction_rhoE'
    execute_scalars_on = 'none'
    execute_on = 'initial timestep_end'
  []
[]

(modules/thermal_hydraulics/test/tests/components/flow_channel_1phase/err.overspecified.i)

[GlobalParams]
  gravity_vector = '0 0 0'

  initial_vel = 0
  initial_p = 1e5
  initial_T = 300

  closures = simple_closures
[]

[FluidProperties]
  [water]
    type = StiffenedGasFluidProperties
    gamma = 2.35
    cv = 1816.0
    q = -1.167e6
    p_inf = 1.0e9
    q_prime = 0
  []
[]

[Closures]
  [simple_closures]
    type = Closures1PhaseSimple
  []
[]

[Components]
  [pipe]
    type = FlowChannel1Phase
    fp = water
    # geometry
    position = '0 0 0'
    orientation = '1 0 0'
    A = 1.
    D_h = 1.12837916709551
    f = 0.01
    length = 1
    n_elems = 100
  []

  [inlet1]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 10
    T0 = 10
  []

  [inlet2]
    type = InletStagnationPressureTemperature1Phase
    input = 'pipe:in'
    p0 = 11
    T0 = 10
  []

  [outlet1]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 10
  []

  [outlet2]
    type = Outlet1Phase
    input = 'pipe:out'
    p = 11
  []
[]

[Preconditioning]
  [pc]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  scheme = 'bdf2'

  dt = 1e-4
  dtmin = 1.e-7

  solve_type = 'PJFNK'
  nl_rel_tol = 1e-9
  nl_abs_tol = 1e-8
  nl_max_its = 10

  l_tol = 1e-8
  l_max_its = 100

  start_time = 0.0
  num_steps = 10
[]

[Outputs]
  [out]
    type = Exodus
  []
[]