The NormalNodalLMMechanicalContact class is used to ensure that the Karush-Kuhn-Tucker conditions of mechanical contact are satisfied:
where is the gap and is the contact pressure, a Lagrange multipler variable living on the secondary face. This object enforces constraints nodally so that zero penetration of nodes is observed into the primary face.
The ncp_function_type parameter specifies the type of nonlinear complimentarity problem (NCP) function to use. The options are either min, which is just the min function, or fb which represents the Fischer-Burmeister function. In our experience, the min function achieves better convergence in the non-linear solve. The c parameter is used to balance the size of the gap and the normal contact pressure. If the contact pressure is of order 10000, and the gap is of order .01, then c should be set to 1e6 in order to bring components of the NCP function onto the same level and achieve optimal convergence in the non-linear solve.
Implements the KKT conditions for normal contact using an NCP function. Requires that either the gap distance or the normal contact pressure (represented by the value of variable) is zero. The LM variable must be of the same order as the mesh
(modules/contact/test/tests/normal-nodal-lm-tan-tolerance/normal-nodal-lm-tan-tolerance.i)
[GlobalParams]
displacements = 'disp_x disp_y'
preset = false
[]
[Mesh]
[file]
type = FileMeshGenerator
file = 2blk-gap_no1000.e
[]
[primary]
type = LowerDBlockFromSidesetGenerator
input = file
sidesets = '100'
new_block_id = '3'
[]
[secondary]
type = LowerDBlockFromSidesetGenerator
input = primary
sidesets = '101'
new_block_id = '4'
[]
[]
[Modules/TensorMechanics/Master]
[all]
displacements = 'disp_x disp_y'
strain = FINITE
add_variables = true
block = '1 2'
use_automatic_differentiation = true
scaling = 1e-4
[]
[]
[Materials]
[elasticity_tensor]
type = ADComputeIsotropicElasticityTensor
youngs_modulus = 1e5
poissons_ratio = 0.345
block = '1 2'
[]
[_elastic_strain]
type = ADComputeFiniteStrainElasticStress
block = '1 2'
[]
[]
[Variables]
[mortar_normal_lm]
scaling = 1.0e-3
block = '4'
[]
[]
[Constraints]
[frictionless_normal_lm]
type = NormalNodalLMMechanicalContact
secondary = 101
primary = 100
variable = mortar_normal_lm
primary_variable = disp_x
disp_y = disp_y
ncp_function_type = min
c = 1.0e4
tangential_tolerance = .05
[]
[normal_x]
type = NormalMortarMechanicalContact
primary_boundary = 100
secondary_boundary = 101
primary_subdomain = 3
secondary_subdomain = 4
variable = mortar_normal_lm
secondary_variable = disp_x
component = x
use_displaced_mesh = true
compute_lm_residuals = false
correct_edge_dropping = true
[]
[normal_y]
type = NormalMortarMechanicalContact
primary_boundary = 100
secondary_boundary = 101
primary_subdomain = 3
secondary_subdomain = 4
variable = mortar_normal_lm
secondary_variable = disp_y
component = y
use_displaced_mesh = true
compute_lm_residuals = false
correct_edge_dropping = true
[]
[]
[Functions]
[disp_bc]
type = PiecewiseLinear
x = '0 10.0'
y = '0 -0.30'
[]
[]
[BCs]
[left_x]
type = DirichletBC
variable = disp_x
boundary = 'left'
value = 0.0
[]
[left_y]
type = DirichletBC
variable = disp_y
boundary = 'left'
value = 0.0
[]
[right_x]
type = FunctionDirichletBC
variable = disp_x
boundary = 'right'
function = disp_bc # '-30e-3 * t'
[]
[right_y]
type = FunctionDirichletBC
variable = disp_y
boundary = 'right'
function = 0
[]
[]
[Preconditioning]
[fmp]
type = FDP
full = true
finite_difference_type = standard
[]
[]
[Executioner]
solve_type = NEWTON
type = Transient
num_steps = 10
dt = 1
dtmin = 1
nl_rel_tol = 1e-12
nl_abs_tol = 1e-13
petsc_options = '-ksp_monitor_true_residual -snes_converged_reason -ksp_converged_reason'
petsc_options_iname = '-pc_type -snes_linesearch_type -pc_factor_shift_type -snes_max_it '
'-ksp_max_it'
petsc_options_value = 'lu basic NONZERO 20 30'
[Predictor]
type = SimplePredictor
scale = 1
[]
[]
[Outputs]
checkpoint = true
exodus = true
print_linear_residuals = false
[dof]
type = DOFMap
execute_on = 'initial'
[]
[]
[Debug]
show_var_residual_norms = true
[]
(modules/contact/test/tests/bouncing-block-contact/frictional-nodal-min-lm-mortar-disp.i)
starting_point = 2e-1
offset = 1e-2
[GlobalParams]
displacements = 'disp_x disp_y'
diffusivity = 1e0
scaling = 1e0
[]
[Mesh]
file = long-bottom-block-1elem-blocks.e
[]
[Variables]
[./disp_x]
block = '1 2'
[../]
[./disp_y]
block = '1 2'
[../]
[./normal_lm]
block = 3
[../]
[./tangential_lm]
block = 3
[../]
[]
[ICs]
[./disp_y]
block = 2
variable = disp_y
value = ${fparse starting_point + offset}
type = ConstantIC
[../]
[]
[Kernels]
[./disp_x]
type = MatDiffusion
variable = disp_x
[../]
[./disp_y]
type = MatDiffusion
variable = disp_y
[../]
[]
[Constraints]
[normal_lm]
type = NormalNodalLMMechanicalContact
primary = 20
secondary = 10
variable = normal_lm
primary_variable = disp_x
disp_y = disp_y
ncp_function_type = min
[]
[normal_x]
type = NormalMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = normal_lm
secondary_variable = disp_x
component = x
use_displaced_mesh = true
compute_lm_residuals = false
[]
[normal_y]
type = NormalMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = normal_lm
secondary_variable = disp_y
component = y
use_displaced_mesh = true
compute_lm_residuals = false
[]
[tangential_lm]
type = TangentialNodalLMMechanicalContact
primary = 20
secondary = 10
variable = tangential_lm
primary_variable = disp_x
disp_y = disp_y
contact_pressure = normal_lm
ncp_function_type = min
mu = .1
[]
[tangential_x]
type = TangentialMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = tangential_lm
secondary_variable = disp_x
component = x
use_displaced_mesh = true
compute_lm_residuals = false
[]
[tangential_y]
type = TangentialMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = tangential_lm
secondary_variable = disp_y
component = y
use_displaced_mesh = true
compute_lm_residuals = false
[]
[]
[BCs]
[./botx]
type = DirichletBC
variable = disp_x
boundary = 40
value = 0.0
[../]
[./boty]
type = DirichletBC
variable = disp_y
boundary = 40
value = 0.0
[../]
[./topy]
type = FunctionDirichletBC
variable = disp_y
boundary = 30
function = '${starting_point} * cos(2 * pi / 40 * t) + ${offset}'
[../]
[./leftx]
type = FunctionDirichletBC
variable = disp_x
boundary = 50
function = '1e-2 * t'
[../]
[]
[Executioner]
type = Transient
end_time = 200
dt = 5
dtmin = .1
solve_type = 'PJFNK'
petsc_options = '-snes_converged_reason -ksp_converged_reason -pc_svd_monitor -snes_linesearch_monitor -snes_ksp_ew'
petsc_options_iname = '-pc_type -pc_factor_shift_type -pc_factor_shift_amount -mat_mffd_err'
petsc_options_value = 'lu NONZERO 1e-15 1e-5'
l_max_its = 30
nl_max_its = 20
line_search = 'none'
snesmf_reuse_base = false
[]
[Debug]
show_var_residual_norms = true
[]
[Outputs]
[exodus]
type = Exodus
sync_times = '0 5 10 15 20 25 30 35 40 45 50'
file_base = frictional-nodal-min-lm-mortar-disp_out
[]
[dof]
type = DOFMap
execute_on = 'initial'
[]
[]
[Preconditioning]
[./smp]
type = SMP
full = true
[../]
[]
[Postprocessors]
[./num_nl]
type = NumNonlinearIterations
[../]
[./cumulative]
type = CumulativeValuePostprocessor
postprocessor = num_nl
[../]
[contact]
type = ContactDOFSetSize
variable = normal_lm
subdomain = '3'
execute_on = 'nonlinear timestep_end'
[]
[]
(modules/contact/test/tests/bouncing-block-contact/frictional-nodal-min-normal-lm-mortar-fb-tangential-lm-mortar-disp.i)
starting_point = 2e-1
# We offset slightly so we avoid the case where the bottom of the secondary block and the top of the
# primary block are perfectly vertically aligned which can cause the backtracking line search some
# issues for a coarse mesh (basic line search handles that fine)
offset = 1e-2
[GlobalParams]
displacements = 'disp_x disp_y'
diffusivity = 1e0
scaling = 1e0
[]
[Mesh]
[./file_mesh]
type = FileMeshGenerator
file = long-bottom-block-1elem-blocks-coarse.e
[../]
[]
[Variables]
[./disp_x]
block = '1 2'
# order = SECOND
[../]
[./disp_y]
block = '1 2'
# order = SECOND
[../]
[./frictional_normal_lm]
block = 3
# family = MONOMIAL
# order = CONSTANT
[../]
[./frictional_tangential_lm]
block = 3
family = MONOMIAL
order = CONSTANT
[../]
[]
[ICs]
[./disp_y]
block = 2
variable = disp_y
value = ${fparse starting_point + offset}
type = ConstantIC
[../]
[]
[Kernels]
[./disp_x]
type = MatDiffusion
variable = disp_x
[../]
[./disp_y]
type = MatDiffusion
variable = disp_y
[../]
[]
[Constraints]
[frictional_normal_lm]
type = NormalNodalLMMechanicalContact
secondary = 10
primary = 20
variable = frictional_normal_lm
primary_variable = disp_x
disp_y = disp_y
ncp_function_type = min
[../]
[normal_x]
type = NormalMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = frictional_normal_lm
secondary_variable = disp_x
component = x
use_displaced_mesh = true
compute_lm_residuals = false
[]
[normal_y]
type = NormalMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = frictional_normal_lm
secondary_variable = disp_y
component = y
use_displaced_mesh = true
compute_lm_residuals = false
[]
[frictional_tangential_lm]
type = TangentialMortarLMMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = frictional_tangential_lm
secondary_variable = disp_x
secondary_disp_y = disp_y
use_displaced_mesh = true
compute_primal_residuals = false
contact_pressure = frictional_normal_lm
friction_coefficient = .1
ncp_function_type = fb
[]
[tangential_x]
type = TangentialMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = frictional_tangential_lm
secondary_variable = disp_x
component = x
use_displaced_mesh = true
compute_lm_residuals = false
[]
[tangential_y]
type = TangentialMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = frictional_tangential_lm
secondary_variable = disp_y
component = y
use_displaced_mesh = true
compute_lm_residuals = false
[]
[]
[BCs]
[./botx]
type = DirichletBC
variable = disp_x
boundary = 40
value = 0.0
[../]
[./boty]
type = DirichletBC
variable = disp_y
boundary = 40
value = 0.0
[../]
[./topy]
type = FunctionDirichletBC
variable = disp_y
boundary = 30
function = '${starting_point} * cos(2 * pi / 40 * t) + ${offset}'
[../]
[./leftx]
type = FunctionDirichletBC
variable = disp_x
boundary = 50
function = '1e-2 * t'
[../]
[]
[Executioner]
type = Transient
end_time = 200
dt = 5
dtmin = .1
solve_type = 'PJFNK'
petsc_options = '-snes_converged_reason -ksp_converged_reason -pc_svd_monitor -snes_linesearch_monitor -snes_ksp_ew'
petsc_options_iname = '-pc_type -pc_factor_shift_type -pc_factor_shift_amount -mat_mffd_err'
petsc_options_value = 'lu NONZERO 1e-15 1e-5'
l_max_its = 30
nl_max_its = 20
line_search = 'none'
snesmf_reuse_base = false
# [./Predictor]
# type = SimplePredictor
# scale = 1.0
# [../]
[]
[Debug]
show_var_residual_norms = true
[]
[Outputs]
exodus = true
# checkpoint = true
# [./dofmap]
# type = DOFMap
# execute_on = 'initial'
# [../]
[]
[Preconditioning]
[./smp]
type = SMP
full = true
[../]
[]
[Postprocessors]
[./num_nl]
type = NumNonlinearIterations
[../]
[./cumulative]
type = CumulativeValuePostprocessor
postprocessor = num_nl
[../]
[contact]
type = ContactDOFSetSize
variable = frictional_normal_lm
subdomain = '3'
execute_on = 'nonlinear timestep_end'
[]
[]
(modules/contact/test/tests/bouncing-block-contact/frictionless-nodal-min-lm-mortar-disp.i)
starting_point = 2e-1
offset = 1e-2
[GlobalParams]
displacements = 'disp_x disp_y'
diffusivity = 1e0
scaling = 1e0
[]
[Mesh]
file = long-bottom-block-1elem-blocks.e
[]
[Variables]
[./disp_x]
block = '1 2'
[../]
[./disp_y]
block = '1 2'
[../]
[./normal_lm]
block = 3
[../]
[]
[ICs]
[./disp_y]
block = 2
variable = disp_y
value = ${fparse starting_point + offset}
type = ConstantIC
[../]
[]
[Kernels]
[./disp_x]
type = MatDiffusion
variable = disp_x
[../]
[./disp_y]
type = MatDiffusion
variable = disp_y
[../]
[]
[Constraints]
[./lm]
type = NormalNodalLMMechanicalContact
secondary = 10
primary = 20
variable = normal_lm
primary_variable = disp_x
disp_y = disp_y
[../]
[normal_x]
type = NormalMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = normal_lm
secondary_variable = disp_x
component = x
use_displaced_mesh = true
compute_lm_residuals = false
[]
[normal_y]
type = NormalMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = normal_lm
secondary_variable = disp_y
component = y
use_displaced_mesh = true
compute_lm_residuals = false
[]
[]
[BCs]
[./botx]
type = DirichletBC
variable = disp_x
boundary = 40
value = 0.0
[../]
[./boty]
type = DirichletBC
variable = disp_y
boundary = 40
value = 0.0
[../]
[./topy]
type = FunctionDirichletBC
variable = disp_y
boundary = 30
function = '${starting_point} * cos(2 * pi / 40 * t) + ${offset}'
[../]
[./leftx]
type = FunctionDirichletBC
variable = disp_x
boundary = 50
function = '1e-2 * t'
[../]
[]
[Executioner]
type = Transient
end_time = 200
dt = 5
dtmin = .1
solve_type = 'PJFNK'
petsc_options = '-snes_converged_reason -ksp_converged_reason -pc_svd_monitor -snes_linesearch_monitor'
petsc_options_iname = '-pc_type -pc_factor_shift_type -pc_factor_shift_amount -mat_mffd_err'
petsc_options_value = 'lu NONZERO 1e-15 1e-5'
l_max_its = 30
nl_max_its = 20
line_search = 'none'
snesmf_reuse_base = false
[]
[Debug]
show_var_residual_norms = true
[]
[Outputs]
exodus = true
[]
[Preconditioning]
[./smp]
type = SMP
full = true
[../]
[]
[Postprocessors]
active = 'num_nl cumulative contact'
[./num_nl]
type = NumNonlinearIterations
[../]
[./cumulative]
type = CumulativeValuePostprocessor
postprocessor = num_nl
[../]
[contact]
type = ContactDOFSetSize
variable = normal_lm
subdomain = '3'
execute_on = 'nonlinear timestep_end'
[]
[]
(modules/contact/test/tests/bouncing-block-contact/frictionless-nodal-fb-lm-nodal-disp.i)
starting_point = 2e-1
offset = 1e-2
[GlobalParams]
displacements = 'disp_x disp_y'
diffusivity = 1e0
scaling = 1e0
[]
[Mesh]
file = long-bottom-block-1elem-blocks.e
[]
[Problem]
kernel_coverage_check = false
[]
[Variables]
[./disp_x]
block = '1 2'
[../]
[./disp_y]
block = '1 2'
[../]
[./normal_lm]
block = 3
[../]
[]
[ICs]
[./disp_y]
block = 2
variable = disp_y
value = ${fparse starting_point + offset}
type = ConstantIC
[../]
[]
[Kernels]
[./disp_x]
type = MatDiffusion
variable = disp_x
[../]
[./disp_y]
type = MatDiffusion
variable = disp_y
[../]
[]
[Constraints]
[./lm]
type = NormalNodalLMMechanicalContact
secondary = 10
primary = 20
variable = normal_lm
primary_variable = disp_x
disp_y = disp_y
ncp_function_type = 'fb'
[../]
[./disp_x]
type = NormalNodalMechanicalContact
secondary = 10
primary = 20
variable = disp_x
primary_variable = disp_x
lambda = normal_lm
component = x
[../]
[./disp_y]
type = NormalNodalMechanicalContact
secondary = 10
primary = 20
variable = disp_y
primary_variable = disp_y
lambda = normal_lm
component = y
[../]
[]
[BCs]
[./botx]
type = DirichletBC
variable = disp_x
preset = false
boundary = 40
value = 0.0
[../]
[./boty]
type = DirichletBC
variable = disp_y
preset = false
boundary = 40
value = 0.0
[../]
[./topy]
type = FunctionDirichletBC
variable = disp_y
preset = false
boundary = 30
function = '${starting_point} * cos(2 * pi / 40 * t) + ${offset}'
[../]
[./leftx]
type = FunctionDirichletBC
variable = disp_x
preset = false
boundary = 50
function = '1e-2 * t'
[../]
[]
[Executioner]
type = Transient
end_time = 200
dt = 5
dtmin = .1
solve_type = 'PJFNK'
petsc_options = '-snes_converged_reason -ksp_converged_reason -pc_svd_monitor -snes_linesearch_monitor'
petsc_options_iname = '-pc_type -pc_factor_shift_type -pc_factor_shift_amount -mat_mffd_err'
petsc_options_value = 'lu NONZERO 1e-15 1e-5'
l_max_its = 30
nl_max_its = 20
line_search = 'none'
snesmf_reuse_base = false
[]
[Debug]
show_var_residual_norms = true
[]
[Outputs]
exodus = true
[]
[Preconditioning]
[./smp]
type = SMP
full = true
[../]
[]
[Postprocessors]
active = 'num_nl cumulative contact'
[./num_nl]
type = NumNonlinearIterations
[../]
[./cumulative]
type = CumulativeValuePostprocessor
postprocessor = num_nl
[../]
[contact]
type = ContactDOFSetSize
variable = normal_lm
subdomain = '3'
execute_on = 'nonlinear timestep_end'
[]
[]
(modules/contact/test/tests/bouncing-block-contact/frictionless-nodal-min-lm-nodal-disp.i)
starting_point = 2e-1
offset = 1e-2
[GlobalParams]
displacements = 'disp_x disp_y'
diffusivity = 1e0
scaling = 1e0
[]
[Mesh]
file = long-bottom-block-1elem-blocks.e
[]
[Problem]
kernel_coverage_check = false
[]
[Variables]
[./disp_x]
block = '1 2'
[../]
[./disp_y]
block = '1 2'
[../]
[./normal_lm]
block = 3
[../]
[]
[ICs]
[./disp_y]
block = 2
variable = disp_y
value = ${fparse starting_point + offset}
type = ConstantIC
[../]
[]
[Kernels]
[./disp_x]
type = MatDiffusion
variable = disp_x
[../]
[./disp_y]
type = MatDiffusion
variable = disp_y
[../]
[]
[Constraints]
[./lm]
type = NormalNodalLMMechanicalContact
secondary = 10
primary = 20
variable = normal_lm
primary_variable = disp_x
disp_y = disp_y
[../]
[./disp_x]
type = NormalNodalMechanicalContact
secondary = 10
primary = 20
variable = disp_x
primary_variable = disp_x
lambda = normal_lm
component = x
[../]
[./disp_y]
type = NormalNodalMechanicalContact
secondary = 10
primary = 20
variable = disp_y
primary_variable = disp_y
lambda = normal_lm
component = y
[../]
[]
[BCs]
[./botx]
type = DirichletBC
variable = disp_x
boundary = 40
value = 0.0
[../]
[./boty]
type = DirichletBC
variable = disp_y
boundary = 40
value = 0.0
[../]
[./topy]
type = FunctionDirichletBC
variable = disp_y
boundary = 30
function = '${starting_point} * cos(2 * pi / 40 * t) + ${offset}'
[../]
[./leftx]
type = FunctionDirichletBC
variable = disp_x
boundary = 50
function = '1e-2 * t'
[../]
[]
[Executioner]
type = Transient
end_time = 200
dt = 5
dtmin = .1
solve_type = 'PJFNK'
petsc_options = '-snes_converged_reason -ksp_converged_reason -pc_svd_monitor -snes_linesearch_monitor'
petsc_options_iname = '-pc_type -pc_factor_shift_type -pc_factor_shift_amount -mat_mffd_err'
petsc_options_value = 'lu NONZERO 1e-15 1e-5'
l_max_its = 30
nl_max_its = 20
line_search = 'none'
snesmf_reuse_base = false
[]
[Debug]
show_var_residual_norms = true
[]
[Outputs]
exodus = true
[dof]
type = DOFMap
execute_on = 'initial'
[]
[]
[Preconditioning]
[./smp]
type = SMP
full = true
[../]
[]
[Postprocessors]
active = 'num_nl cumulative contact'
[./num_nl]
type = NumNonlinearIterations
[../]
[./cumulative]
type = CumulativeValuePostprocessor
postprocessor = num_nl
[../]
[contact]
type = ContactDOFSetSize
variable = normal_lm
subdomain = '3'
execute_on = 'nonlinear timestep_end'
[]
[]
(modules/contact/test/tests/bouncing-block-contact/frictionless-nodal-fb-lm-mortar-disp.i)
starting_point = 2e-1
offset = 1e-2
[GlobalParams]
displacements = 'disp_x disp_y'
diffusivity = 1e0
scaling = 1e0
[]
[Mesh]
file = long-bottom-block-1elem-blocks.e
[]
[Variables]
[./disp_x]
block = '1 2'
[../]
[./disp_y]
block = '1 2'
[../]
[./normal_lm]
block = 3
[../]
[]
[ICs]
[./disp_y]
block = 2
variable = disp_y
value = ${fparse starting_point + offset}
type = ConstantIC
[../]
[]
[Kernels]
[./disp_x]
type = MatDiffusion
variable = disp_x
[../]
[./disp_y]
type = MatDiffusion
variable = disp_y
[../]
[]
[Constraints]
[./lm]
type = NormalNodalLMMechanicalContact
secondary = 10
primary = 20
variable = normal_lm
primary_variable = disp_x
disp_y = disp_y
ncp_function_type = 'fb'
[../]
[normal_x]
type = NormalMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = normal_lm
secondary_variable = disp_x
component = x
use_displaced_mesh = true
compute_lm_residuals = false
[]
[normal_y]
type = NormalMortarMechanicalContact
primary_boundary = 20
secondary_boundary = 10
primary_subdomain = 4
secondary_subdomain = 3
variable = normal_lm
secondary_variable = disp_y
component = y
use_displaced_mesh = true
compute_lm_residuals = false
[]
[]
[BCs]
[./botx]
type = DirichletBC
variable = disp_x
boundary = 40
value = 0.0
[../]
[./boty]
type = DirichletBC
variable = disp_y
boundary = 40
value = 0.0
[../]
[./topy]
type = FunctionDirichletBC
variable = disp_y
boundary = 30
function = '${starting_point} * cos(2 * pi / 40 * t) + ${offset}'
[../]
[./leftx]
type = FunctionDirichletBC
variable = disp_x
boundary = 50
function = '1e-2 * t'
[../]
[]
[Executioner]
type = Transient
end_time = 200
dt = 5
dtmin = .1
solve_type = 'PJFNK'
petsc_options = '-snes_converged_reason -ksp_converged_reason -pc_svd_monitor -snes_linesearch_monitor'
petsc_options_iname = '-pc_type -pc_factor_shift_type -pc_factor_shift_amount -mat_mffd_err'
petsc_options_value = 'lu NONZERO 1e-15 1e-5'
l_max_its = 30
nl_max_its = 20
line_search = 'none'
snesmf_reuse_base = false
[]
[Debug]
show_var_residual_norms = true
[]
[Outputs]
exodus = true
[]
[Preconditioning]
[./smp]
type = SMP
full = true
[../]
[]
[Postprocessors]
active = 'num_nl cumulative contact'
[./num_nl]
type = NumNonlinearIterations
[../]
[./cumulative]
type = CumulativeValuePostprocessor
postprocessor = num_nl
[../]
[contact]
type = ContactDOFSetSize
variable = normal_lm
subdomain = '3'
execute_on = 'nonlinear timestep_end'
[]
[]