- wall_ff_closurechurchillFriction factor closure
Default:churchill
C++ Type:MooseEnum
Controllable:No
Description:Friction factor closure
- wall_htc_closuredittus_boelterHeat transfer coefficient closure
Default:dittus_boelter
C++ Type:MooseEnum
Controllable:No
Description:Heat transfer coefficient closure
Closures1PhaseTHM
Closures for 1-phase flow channels
The closures added are:
a wall friction factor for the pressure drop,
a wall heat transfer coefficient for heat transfer.
The user can choose between a range of correlations for the heat transfer coefficient and friction factor that covers pipes to rod-bundles. The available correlations for the heat transfer coefficient are listed in Table 1.
Table 1: Available correlations for the heat transfer coefficient.
| Name | Coolant | Geometry | Reference |
|---|---|---|---|
| Dittus-Boelter | Liquid/Gases | Pipes | ADWallHeatTransferCoefficient3EqnDittusBoelterMaterial |
| Gnielinski | Liquid/Gases | Pipes | ADWallHeatTransferCoefficientGnielinskiMaterial |
| Wolf-McCarthy | Gases | Pipes | ADWallHeatTransferCoefficientWolfMcCarthyMaterial |
| Lyon | Liquid Sodium | Pipes | ADWallHeatTransferCoefficientLyonMaterial |
| Weisman | Water | Rod-bundles | ADWallHeatTransferCoefficientWeismanMaterial |
| Kazimi-Carelli | Liquid Sodium | Rod-bundles | ADWallHeatTransferCoefficientKazimiMaterial |
| Mikityuk | Liquid Sodium | Rod-bundles | ADWallHeatTransferCoefficientMikityukMaterial |
| Schad | Liquid Sodium | Rod-bundles | ADWallHeatTransferCoefficientSchadMaterial |
The available correlations for the friction factor are listed in Table 2.
Table 2: Available correlations for the friction factor.
| Name | Geometry | Reference |
|---|---|---|
| Churchill | Pipes | ADWallFrictionChurchillMaterial |
| Cheng-Todreas | Rod-bundles | ADWallFrictionChengMaterial |
The user can also define the friction factor directly in the component block, overwriting the value given by the Closures1PhaseTHM, for example:
[Components]
[pipe_1]
type = FlowChannel1Phase
fp = water
position = '0 0 0'
orientation = '1 0 0'
length = 1
n_elems = 10
f = 0.01
[]
[pipe_2]
type = FlowChannel1Phase
fp = water
position = '1 0 0'
orientation = '1 0 0'
length = 1
n_elems = 10
[]
[]
In this case, the friction factor for the Pipe_1 component will be equal to the value defined in the parameter f, while for Pipe_2 the friction factor will given by the correlation chosen in the Closures1PhaseTHM.
Additionally, this object defines:
a wall temperature material, to be able to retrieve the wall temperature as a material property for each heat transfer.
Input Parameters
- control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
- enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:No
Description:Set the enabled status of the MooseObject.
Advanced Parameters
Input Files
- (modules/thermal_hydraulics/tutorials/single_phase_flow/01_flow_channel.i)
- (modules/combined/test/tests/subchannel_thm_coupling/THM_SCM_coupling.i)
- (modules/thermal_hydraulics/tutorials/single_phase_flow/06_custom_closures.i)
- (modules/thermal_hydraulics/tutorials/single_phase_flow/03_upper_loop.i)
- (modules/thermal_hydraulics/tutorials/single_phase_flow/02_core.i)
- (modules/thermal_hydraulics/tutorials/single_phase_flow/05_secondary_side.i)
- (modules/combined/test/tests/subchannel_thm_coupling/THM_SCM_coupling_pump.i)
- (modules/thermal_hydraulics/test/tests/closures/THM_1phase/thm1phase.i)
- (modules/thermal_hydraulics/tutorials/single_phase_flow/04_loop.i)
(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 = ${press}
[]
[]
[Postprocessors]
[core_p_in]
type = SideAverageValue
boundary = core_chan:in
variable = p
[]
[core_p_out]
type = SideAverageValue
boundary = core_chan:out
variable = p
[]
[core_delta_p]
type = ParsedPostprocessor
pp_names = 'core_p_in core_p_out'
expression = 'core_p_in - core_p_out'
[]
[]
[Preconditioning]
[pc]
type = SMP
full = true
[]
[]
[Executioner]
type = Transient
solve_type = NEWTON
line_search = basic
start_time = 0
end_time = 1000
dt = 10
petsc_options_iname = '-pc_type'
petsc_options_value = 'lu'
nl_rel_tol = 1e-8
nl_abs_tol = 1e-8
nl_max_its = 25
[]
[Outputs]
exodus = true
[console]
type = Console
max_rows = 1
outlier_variable_norms = false
[]
print_linear_residuals = false
[]
(modules/combined/test/tests/subchannel_thm_coupling/THM_SCM_coupling.i)
# THM file based on https://mooseframework.inl.gov/modules/thermal_hydraulics/tutorials/single_phase_flow/step05.html
# Used to loosely couple THM with SCM
# This is a simple open loop with fixed massflow at the inlet and pressure at the outlet.
# THM sends massflux and temperature at the inlet of the core, and pressure at the outlet of the core
# to subchannel. Subchannel returns total pressure drop of the assembly and total power to THM and THM calculates an
# average friction factor for the core region.
T_in = 583.0 # K
m_dot_in = 1 # kg/s
press = 2e5 # Pa
SC_core = 0.0004980799633447909 #m2
# core parameters
core_length = 1. # m
core_n_elems = 1
A_core = 0.005 #dummy
# pipe parameters
pipe_dia = '${units 10. cm -> m}'
A_pipe = '${fparse 0.25 * pi * pipe_dia^2}'
# heat exchanger parameters
hx_dia_inner = '${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 = sodium_eos
[]
[Functions]
[q_wall_fn]
type = ParsedFunction
symbol_names = 'core_power length'
symbol_values = 'core_power ${core_length}'
expression = 'core_power/length'
[]
[]
[FluidProperties]
[water]
type = StiffenedGasFluidProperties
gamma = 2.35
cv = 1816.0
q = -1.167e6
p_inf = 1.0e9
q_prime = 0
[]
[sodium_eos]
type = StiffenedGasFluidProperties
gamma = 1.24
cv = 1052.8
q = -2.6292e+05
p_inf = 1.1564e+08
q_prime = 0
mu = 3.222e-04
k = 73.82
[]
[]
[Closures]
[thm_closures]
type = Closures1PhaseTHM
[]
[none_closures]
type = Closures1PhaseNone
[]
[]
[Materials]
[f_mat]
type = ADParsedMaterial
property_name = f_D
postprocessor_names = 'core_f'
expression = 'core_f'
block = 'core_chan'
[]
[]
[HeatStructureMaterials]
[steel]
type = SolidMaterialProperties
rho = 8050
k = 45
cp = 466
[]
[]
[Components]
[inlet]
type = InletMassFlowRateTemperature1Phase
input = 'bottom_2:in'
m_dot = ${m_dot_in}
T = ${T_in}
[]
[outlet]
type = Outlet1Phase
input = 'bottom_1:out'
p = ${press}
[]
[up_pipe_1]
type = FlowChannel1Phase
position = '0 0 -0.5'
orientation = '0 0 1'
length = 0.5
n_elems = 15
A = ${A_pipe}
D_h = ${pipe_dia}
[]
[jct1]
type = JunctionParallelChannels1Phase
position = '0 0 0'
connections = 'up_pipe_1:out core_chan:in'
volume = 1e-5
[]
[core_chan]
type = FlowChannel1Phase
position = '0 0 0'
orientation = '0 0 1'
length = ${core_length}
n_elems = ${core_n_elems}
A = ${A_core}
closures = none_closures
[]
[core_ht]
type = HeatTransferFromHeatFlux1Phase
flow_channel = core_chan
q_wall = q_wall_fn
P_hf = 1
[]
[jct2]
type = JunctionParallelChannels1Phase
position = '0 0 1'
connections = 'core_chan:out up_pipe_2:in'
volume = 1e-5
[]
[up_pipe_2]
type = FlowChannel1Phase
position = '0 0 1'
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 1.5'
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 1.5'
orientation = '1 0 0'
length = 0.5
n_elems = 10
A = ${A_pipe}
D_h = ${pipe_dia}
[]
[jct4]
type = VolumeJunction1Phase
position = '0.5 0 1.5'
volume = 1e-5
connections = 'top_pipe_1:out top_pipe_2:in'
[]
[jct5]
type = JunctionOneToOne1Phase
connections = 'top_pipe_2:out down_pipe_1:in'
[]
[down_pipe_1]
type = FlowChannel1Phase
position = '1 0 1.5'
orientation = '0 0 -1'
length = 0.25
A = ${A_pipe}
n_elems = 5
[]
[jct6]
type = JunctionParallelChannels1Phase
position = '1 0 1.25'
connections = 'down_pipe_1:out hx/pri:in'
volume = 1e-5
[]
[hx]
[pri]
type = FlowChannel1Phase
position = '1 0 1.25'
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 1.25'
orientation = '0 0 -1'
length = ${hx_length}
n_elems = ${hx_n_elems}
widths = '${hx_wall_thickness}'
n_part_elems = '3'
materials = 'steel'
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 -0.25'
connections = 'hx/pri:out down_pipe_2:in'
volume = 1e-5
[]
[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 -0.5'
orientation = '-1 0 0'
length = 0.5
n_elems = 5
A = ${A_pipe}
D_h = ${pipe_dia}
[]
[bottom_2]
type = FlowChannel1Phase
position = '0.5 0 -0.5'
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 = ${m_dot_sec_in}
T = 300
[]
[outlet_sec]
type = Outlet1Phase
input = 'hx/sec:out'
p = 1e5
[]
[]
[Postprocessors]
[power_to_coolant]
type = ADHeatRateDirectFlowChannel
q_wall_prop = q_wall
block = core_chan
P_hf = 1
[]
[core_T_out]
type = SideAverageValue
boundary = core_chan:out
variable = T
[]
[T_out]
type = SideAverageValue
boundary = bottom_1:out
variable = T
[]
[core_p_in]
type = SideAverageValue
boundary = up_pipe_1:out
variable = p
[]
[core_p_out]
type = SideAverageValue
boundary = up_pipe_2:in
variable = p
[]
[core_delta_p]
type = ParsedPostprocessor
pp_names = 'core_p_in core_p_out'
function = '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
[]
############## Friction Factor Calculation #############
[av_rhouA]
type = ElementAverageValue
variable = 'rhouA'
block = 'core_chan'
[]
[av_rho]
type = ElementAverageValue
variable = 'rho'
block = 'core_chan'
[]
[Kloss]
type = ParsedPostprocessor
pp_names = 'core_delta_p_tgt av_rhouA av_rho'
function = '2.0 * core_delta_p_tgt * av_rho * ${A_core} * ${A_core} / (av_rhouA * av_rhouA)'
[]
[Dh]
type = ADElementAverageMaterialProperty
mat_prop = D_h
block = core_chan
[]
[core_f]
type = ParsedPostprocessor
pp_names = 'Kloss Dh'
function = 'Kloss * Dh / ${core_length}'
[]
### INFO to send to SC
[outlet_pressure]
type = SideAverageValue
boundary = up_pipe_2:in
variable = p
[]
[inlet_mass_flow_rate]
type = ADFlowJunctionFlux1Phase
boundary = up_pipe_1:out
connection_index = 0
equation = mass
junction = jct1
[]
[inlet_temperature]
type = SideAverageValue
boundary = up_pipe_1:out
variable = T
[]
[inlet_mass_flux]
type = ParsedPostprocessor
pp_names = 'inlet_mass_flow_rate'
function = 'abs(inlet_mass_flow_rate/${SC_core})'
[]
#####
##### Info received from subchannel
[core_delta_p_tgt]
type = Receiver
default = 100
[]
[core_power]
type = Receiver
default = 100
[]
[]
[Preconditioning]
[pc]
type = SMP
full = true
[]
[]
[Executioner]
type = Transient
start_time = 0
[TimeStepper]
type = IterationAdaptiveDT
dt = 0.01
[]
# dtmax = 5
end_time = 5
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]
csv = true
[console]
type = Console
max_rows = 1
outlier_variable_norms = false
[]
print_linear_residuals = false
[]
################################################################################
# A multiapp that couples THM to subchannel
################################################################################
[MultiApps]
[subchannel]
type = FullSolveMultiApp
input_files = 'subchannel.i'
execute_on = 'timestep_end'
positions = '0 0 0'
max_procs_per_app = 1
output_in_position = true
bounding_box_padding = '0 0 0.1'
[]
[]
[Transfers]
[pressure_drop_transfer] # Get pressure drop to THM from subchannel
type = MultiAppPostprocessorTransfer
from_multi_app = subchannel
from_postprocessor = total_pressure_drop_SC
to_postprocessor = core_delta_p_tgt
reduction_type = average
execute_on = 'timestep_end'
[]
[power_transfer] # Get Total power to THM from subchannel
type = MultiAppPostprocessorTransfer
from_multi_app = subchannel
from_postprocessor = Total_power
to_postprocessor = core_power
reduction_type = average
execute_on = 'timestep_end'
[]
[mass_flux_tranfer] # Send mass_flux at the inlet of THM core to subchannel
type = MultiAppPostprocessorTransfer
to_multi_app = subchannel
from_postprocessor = inlet_mass_flux
to_postprocessor = report_mass_flux_inlet
execute_on = 'timestep_end'
[]
[outlet_pressure_tranfer] # Send pressure at the outlet of THM core to subchannel
type = MultiAppPostprocessorTransfer
to_multi_app = subchannel
from_postprocessor = outlet_pressure
to_postprocessor = report_pressure_outlet
execute_on = 'timestep_end'
[]
[inlet_temperature_transfer]
type = MultiAppPostprocessorTransfer
to_multi_app = subchannel
from_postprocessor = inlet_temperature
to_postprocessor = report_temperature_inlet
execute_on = 'timestep_end'
[]
[]
(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
[]
[]
[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
[]
[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
[]
[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'
[]
[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
[]
[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 = ${hx_dia_inner}
closures = ''
[]
[ht_pri]
type = HeatTransferFromHeatStructure1Phase
hs = hx/wall
hs_side = inner
flow_channel = hx/pri
P_hf = '${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
[]
[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
[]
[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/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
[]
[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
[]
[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/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/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
[]
[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
[]
[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'
[]
[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
[]
[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
[]
[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
[]
[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/combined/test/tests/subchannel_thm_coupling/THM_SCM_coupling_pump.i)
# THM file based on https://mooseframework.inl.gov/modules/thermal_hydraulics/tutorials/single_phase_flow/step05.html
# Used to loosely couple THM with SCM
# This is a simple closed loop with a pump providing pressure head, core, pressurizer and HX.
# THM sends massflux and temperature at the inlet of the core, and pressure at the outlet of the core
# to subchannel. Subchannel returns total pressure drop of the assembly and total power to THM and THM calculates an
# average friction factor for the core region.
T_in = 583.0 # K
press = 2e5 # Pa
SC_core = 0.0004980799633447909 #m2
# core parameters
core_length = 1. # m
core_n_elems = 1
A_core = 0.005 #dummy
# pipe parameters
pipe_dia = '${units 10. cm -> m}'
A_pipe = '${fparse 0.25 * pi * pipe_dia^2}'
# 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 = sodium_eos
[]
[Functions]
[q_wall_fn]
type = ParsedFunction
symbol_names = 'core_power length'
symbol_values = 'core_power ${core_length}'
expression = 'core_power/length'
[]
[]
[FluidProperties]
[water]
type = StiffenedGasFluidProperties
gamma = 2.35
cv = 1816.0
q = -1.167e6
p_inf = 1.0e9
q_prime = 0
[]
[sodium_eos]
type = StiffenedGasFluidProperties
gamma = 1.24
cv = 1052.8
q = -2.6292e+05
p_inf = 1.1564e+08
q_prime = 0
mu = 3.222e-04
k = 73.82
[]
[]
[Closures]
[thm_closures]
type = Closures1PhaseTHM
[]
[none_closures]
type = Closures1PhaseNone
[]
[]
[Materials]
[f_mat]
type = ADParsedMaterial
property_name = f_D
postprocessor_names = 'core_f'
expression = 'core_f'
block = 'core_chan'
[]
[]
[HeatStructureMaterials]
[steel]
type = SolidMaterialProperties
rho = 8050
k = 45
cp = 466
[]
[]
[Components]
[up_pipe_1]
type = FlowChannel1Phase
position = '0 0 -0.5'
orientation = '0 0 1'
length = 0.5
n_elems = 15
A = ${A_pipe}
D_h = ${pipe_dia}
[]
[jct1]
type = JunctionParallelChannels1Phase
position = '0 0 0'
connections = 'up_pipe_1:out core_chan:in'
volume = 1e-5
[]
[core_chan]
type = FlowChannel1Phase
position = '0 0 0'
orientation = '0 0 1'
length = ${core_length}
n_elems = ${core_n_elems}
A = ${A_core}
closures = none_closures
[]
[core_ht]
type = HeatTransferFromHeatFlux1Phase
flow_channel = core_chan
q_wall = q_wall_fn
P_hf = 1
[]
[jct2]
type = JunctionParallelChannels1Phase
position = '0 0 1'
connections = 'core_chan:out up_pipe_2:in'
volume = 1e-5
[]
[up_pipe_2]
type = FlowChannel1Phase
position = '0 0 1'
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 1.5'
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 1.5'
orientation = '1 0 0'
length = 0.5
n_elems = 10
A = ${A_pipe}
D_h = ${pipe_dia}
[]
[jct4]
type = VolumeJunction1Phase
position = '0.5 0 1.5'
volume = 1e-5
connections = 'top_pipe_1:out top_pipe_2:in press_pipe:in'
[]
[press_pipe]
type = FlowChannel1Phase
position = '0.5 0 1.5'
orientation = '0 1 0'
length = 0.2
n_elems = 5
A = ${A_pipe}
D_h = ${pipe_dia}
[]
[pressurizer]
type = InletStagnationPressureTemperature1Phase
p0 = ${press}
T0 = 580
input = press_pipe:out
[]
[jct5]
type = JunctionOneToOne1Phase
connections = 'top_pipe_2:out down_pipe_1:in'
[]
[down_pipe_1]
type = FlowChannel1Phase
position = '1 0 1.5'
orientation = '0 0 -1'
length = 0.25
A = ${A_pipe}
n_elems = 5
[]
[jct6]
type = JunctionParallelChannels1Phase
position = '1 0 1.25'
connections = 'down_pipe_1:out hx/pri:in'
volume = 1e-5
[]
[hx]
[pri]
type = FlowChannel1Phase
position = '1 0 1.25'
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 1.25'
orientation = '0 0 -1'
length = ${hx_length}
n_elems = ${hx_n_elems}
widths = '${hx_wall_thickness}'
n_part_elems = '3'
materials = 'steel'
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 -0.25'
connections = 'hx/pri:out down_pipe_2:in'
volume = 1e-5
[]
[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 -0.5'
orientation = '-1 0 0'
length = 0.5
n_elems = 5
A = ${A_pipe}
D_h = ${pipe_dia}
[]
[pump]
type = Pump1Phase
position = '0.5 0 -0.5'
connections = 'bottom_1:out bottom_2:in'
volume = 1e-4
A_ref = ${A_pipe}
head = 3.56
[]
[bottom_2]
type = FlowChannel1Phase
position = '0.5 0 -0.5'
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 = ${m_dot_sec_in}
T = 300
[]
[outlet_sec]
type = Outlet1Phase
input = 'hx/sec:out'
p = 1e5
[]
[]
[Postprocessors]
[power_to_coolant]
type = ADHeatRateDirectFlowChannel
q_wall_prop = q_wall
block = core_chan
P_hf = 1
[]
[core_T_out]
type = SideAverageValue
boundary = core_chan:out
variable = T
[]
[T_out]
type = SideAverageValue
boundary = bottom_1:out
variable = T
[]
[core_p_in]
type = SideAverageValue
boundary = up_pipe_1:out
variable = p
[]
[core_p_out]
type = SideAverageValue
boundary = up_pipe_2:in
variable = p
[]
[core_delta_p]
type = ParsedPostprocessor
pp_names = 'core_p_in core_p_out'
function = '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
[]
############## Friction Factor Calculation #############
[av_rhouA]
type = ElementAverageValue
variable = 'rhouA'
block = 'core_chan'
[]
[av_rho]
type = ElementAverageValue
variable = 'rho'
block = 'core_chan'
[]
[Kloss]
type = ParsedPostprocessor
pp_names = 'core_delta_p_tgt av_rhouA av_rho'
function = '2.0 * core_delta_p_tgt * av_rho * ${A_core} * ${A_core} / (av_rhouA * av_rhouA)'
[]
[Dh]
type = ADElementAverageMaterialProperty
mat_prop = D_h
block = core_chan
[]
[core_f]
type = ParsedPostprocessor
pp_names = 'Kloss Dh'
function = 'Kloss * Dh / ${core_length}'
[]
### INFO to send to SC
[outlet_pressure]
type = SideAverageValue
boundary = up_pipe_2:in
variable = p
[]
[inlet_mass_flow_rate]
type = ADFlowJunctionFlux1Phase
boundary = up_pipe_1:out
connection_index = 0
equation = mass
junction = jct1
[]
[inlet_temperature]
type = SideAverageValue
boundary = up_pipe_1:out
variable = T
[]
[inlet_mass_flux]
type = ParsedPostprocessor
pp_names = 'inlet_mass_flow_rate'
function = 'abs(inlet_mass_flow_rate/${SC_core})'
[]
#####
##### Info received from subchannel
[core_delta_p_tgt]
type = Receiver
default = 100
[]
[core_power]
type = Receiver
default = 100
[]
[]
[Preconditioning]
[pc]
type = SMP
full = true
[]
[]
[Executioner]
type = Transient
start_time = 0
[TimeStepper]
type = IterationAdaptiveDT
dt = 2
[]
dtmax = 50
end_time = 10
line_search = basic
solve_type = NEWTON
petsc_options_iname = '-pc_type'
petsc_options_value = 'lu'
nl_rel_tol = 1e-7
nl_abs_tol = 1e-7
nl_max_its = 25
fixed_point_min_its = 1
fixed_point_max_its = 5
accept_on_max_fixed_point_iteration = true
auto_advance = true
relaxation_factor = 0.5
[]
[Outputs]
csv = true
[console]
type = Console
max_rows = 1
outlier_variable_norms = false
[]
print_linear_residuals = false
[]
################################################################################
# A multiapp that couples THM to subchannel
################################################################################
[MultiApps]
# active = ''
[subchannel]
type = FullSolveMultiApp
input_files = 'subchannel.i'
execute_on = 'timestep_end'
positions = '0 0 0'
max_procs_per_app = 1
output_in_position = true
bounding_box_padding = '0 0 0.1'
[]
[]
[Transfers]
# active = ''
[pressure_drop_transfer] # Get pressure drop to THM from subchannel
type = MultiAppPostprocessorTransfer
from_multi_app = subchannel
from_postprocessor = total_pressure_drop_SC
to_postprocessor = core_delta_p_tgt
reduction_type = average
execute_on = 'timestep_end'
[]
[power_transfer] # Get Total power to THM from subchannel
type = MultiAppPostprocessorTransfer
from_multi_app = subchannel
from_postprocessor = Total_power
to_postprocessor = core_power
reduction_type = average
execute_on = 'timestep_end'
[]
[mass_flux_tranfer] # Send mass_flux at the inlet of THM core to subchannel
type = MultiAppPostprocessorTransfer
to_multi_app = subchannel
from_postprocessor = inlet_mass_flux
to_postprocessor = report_mass_flux_inlet
execute_on = 'timestep_end'
[]
[outlet_pressure_tranfer] # Send pressure at the outlet of THM core to subchannel
type = MultiAppPostprocessorTransfer
to_multi_app = subchannel
from_postprocessor = outlet_pressure
to_postprocessor = report_pressure_outlet
execute_on = 'timestep_end'
[]
[inlet_temperature_transfer]
type = MultiAppPostprocessorTransfer
to_multi_app = subchannel
from_postprocessor = inlet_temperature
to_postprocessor = report_temperature_inlet
execute_on = 'timestep_end'
[]
[]
(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 = ${file_base}
[]
(modules/thermal_hydraulics/tutorials/single_phase_flow/04_loop.i)
T_in = 300. # K
m_dot_in = 1e-2 # kg/s
press = 10e5 # Pa
# core parameters
core_length = 1. # m
core_n_elems = 25
core_dia = '${units 2. cm -> m}'
core_pitch = '${units 8.7 cm -> m}'
# pipe parameters
pipe_dia = '${units 10. cm -> m}'
A_pipe = '${fparse 0.25 * pi * pipe_dia^2}'
A_core = '${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}
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 = simple_closures
fp = he
[]
[FluidProperties]
[he]
type = IdealGasFluidProperties
molar_mass = 4e-3
gamma = 1.67
k = 0.2556
mu = 3.22639e-5
[]
[]
[Closures]
[simple_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
[]
[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
[]
[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'
[]
[press_pipe]
type = FlowChannel1Phase
position = '0.5 0 2'
orientation = '0 0 1'
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 = 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}'
[]
[jct7]
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}
[]
[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
[]
[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}
[]
[jct10]
type = JunctionOneToOne1Phase
connections = 'bottom_2:out up_pipe_1:in'
[]
[]
[ControlLogic]
[set_point]
type = GetFunctionValueControl
function = ${m_dot_in}
[]
[pid]
type = PIDControl
initial_value = 0
set_point = set_point:value
input = m_dot_pump
K_p = 1.
K_i = 4.
K_d = 0
[]
[set_pump_head]
type = SetComponentRealValueControl
component = pump
parameter = head
value = pid:output
[]
[]
[Postprocessors]
[power_to_coolant]
type = ADHeatRateConvection1Phase
block = core_chan
P_hf = '${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 = cooling_pipe:out
variable = T
[]
[pump_head]
type = RealComponentParameterValuePostprocessor
component = pump
parameter = head
[]
[]
[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
[]