BCs System

construction:Undocumented System

The BCs system has not been documented. The content listed below should be used as a starting point for documenting the system, which includes the typical automatic documentation associated with a system; however, what is contained is ultimately determined by what is necessary to make the documentation clear for users.


# BCs System

## Overview

!! Replace this line with information regarding the BCs system.

## Example Input File Syntax

!! Describe and include an example of how to use the BCs system.

!syntax list /BCs objects=True actions=False subsystems=False

!syntax list /BCs objects=False actions=False subsystems=True

!syntax list /BCs objects=False actions=True subsystems=False

Available Objects

Moose App
ADDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-546d81cb-4d7d-491b-a3dd-2338bd9f40a8");katex.render("u=g", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-f451e850-8571-474d-a9cb-551a696e8614");katex.render("g", element, {displayMode:false,throwOnError:false});$ is a constant, controllable value.
ADFunctionDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-3f13d8a4-7ceb-4cd7-8d8f-a1ab6accf7a9");katex.render("u=g", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-b869d233-b882-42c8-be20-369f24c3698b");katex.render("g", element, {displayMode:false,throwOnError:false});$ is calculated by a function.
ADFunctionNeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-6962184f-df8f-4f73-9f62-e2907a61c211");katex.render("\\frac{\\partial u}{\\partial n}=h(t,\\vec{x})", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-ee73147a-6588-4098-ae99-afee079acf5c");katex.render("h", element, {displayMode:false,throwOnError:false});$ is a (possibly) time and space-dependent MOOSE Function.
ADFunctionPenaltyDirichletBCEnforces a (possibly) time and space-dependent MOOSE Function Dirichlet boundary condition in a weak sense by penalizing differences between the current solution and the Dirichlet data.
ADMatNeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-f3f14a82-2270-4e2d-9b43-c85b48013de0");katex.render("\\frac{C \\partial u}{\\partial n}=M*h", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-0967eb3a-2219-4a31-a915-143eb38c6090");katex.render("h", element, {displayMode:false,throwOnError:false});$ is a constant, $var element = document.getElementById("moose-equation-b9d37221-d305-49d5-a2db-79b5399253ee");katex.render("M", element, {displayMode:false,throwOnError:false});$ is a material property, and $var element = document.getElementById("moose-equation-b1a4c51a-767d-4207-969e-c405cc27a78e");katex.render("C", element, {displayMode:false,throwOnError:false});$ is a coefficient defined by the kernel for $var element = document.getElementById("moose-equation-7a9b642c-cd2c-449b-85fb-6ab9d2f3c356");katex.render("u", element, {displayMode:false,throwOnError:false});$ .
ADMatchedValueBCImplements a NodalBC which equates two different Variables' values on a specified boundary.
ADNeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-e1de9e9a-34aa-471e-857f-e2b67b5348d0");katex.render("\\frac{\\partial u}{\\partial n}=h", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-4f5e24ee-cf3b-450a-becc-5cad24a59ec3");katex.render("h", element, {displayMode:false,throwOnError:false});$ is a constant, controllable value.
ADPenaltyDirichletBCEnforces a Dirichlet boundary condition in a weak sense by penalizing differences between the current solution and the Dirichlet data.
ADVectorFunctionDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-47f188eb-285b-423b-9988-b645c275016e");katex.render("\\vec{u}=\\vec{g}", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-cf01b359-8e78-43f0-8f00-a394b170053c");katex.render("\\vec{g}", element, {displayMode:false,throwOnError:false});$ components are calculated with functions.
ADVectorMatchedValueBCImplements a ADVectorNodalBC which equates two different Variables' values on a specified boundary.
ArrayDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-f6174150-ae68-4464-b790-8029d6cc3afd");katex.render("\\vec{u}=\\vec{g}", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-367a86b1-138b-4416-91d2-89909b1c3b45");katex.render("\\vec{g}", element, {displayMode:false,throwOnError:false});$ are constant, controllable values.
ArrayHFEMDirichletBCImposes the Dirichlet BC with HFEM.
ArrayNeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-366ecc4b-ba7b-4332-bd50-60cde2030948");katex.render("\\frac{\\partial u}{\\partial n}=h", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-f6e8b804-c3d7-45d3-b1f5-e41ca71d37d9");katex.render("h", element, {displayMode:false,throwOnError:false});$ is a constant, controllable value.
ArrayPenaltyDirichletBCEnforces a Dirichlet boundary condition in a weak sense with $var element = document.getElementById("moose-equation-e100d72f-576c-4c2d-8f4e-45f572bcb0da");katex.render("p(\\vec{u}^\\ast, \\vec{u} - \\vec{u}_0)", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-953e09e8-5ba8-4555-a47d-5ff0cffe4364");katex.render("p", element, {displayMode:false,throwOnError:false});$ is the constant scalar penalty; $var element = document.getElementById("moose-equation-c1dfb6e5-9f10-4b4b-aa87-bb6d915a9038");katex.render("\\vec{u}^\\ast", element, {displayMode:false,throwOnError:false});$ is the test functions and $var element = document.getElementById("moose-equation-16365ef9-1918-4b91-90ba-8fa2d3845053");katex.render("\\vec{u} - \\vec{u}_0", element, {displayMode:false,throwOnError:false});$ is the differences between the current solution and the Dirichlet data.
ArrayVacuumBCImposes the Robin boundary condition $var element = document.getElementById("moose-equation-01b8066d-6bfe-495d-83ed-9fa51bceaaea");katex.render("\\partial_n \\vec{u}=-\\frac{\\vec{\\alpha}}{2}\\vec{u}", element, {displayMode:false,throwOnError:false});$ .
ConvectiveFluxBCDetermines boundary values via the initial and final values, flux, and exposure duration
CoupledVarNeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-2d58843e-1d24-42ed-b267-138ae1550d76");katex.render("\\frac{\\partial u}{\\partial n}=v", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-f3a71c3f-0737-4255-83a8-91d99074b89b");katex.render("v", element, {displayMode:false,throwOnError:false});$ is a variable.
DGFunctionDiffusionDirichletBCDiffusion Dirichlet boundary condition for discontinuous Galerkin method.
DiffusionFluxBCComputes a boundary residual contribution consistent with the Diffusion Kernel. Does not impose a boundary condition; instead computes the boundary contribution corresponding to the current value of grad(u) and accumulates it in the residual vector.
DirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-379c8faf-eacd-4fb3-9e90-b0a4d392935a");katex.render("u=g", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-3aecbe23-bea5-4ea3-b02b-d5877d786768");katex.render("g", element, {displayMode:false,throwOnError:false});$ is a constant, controllable value.
EigenArrayDirichletBCArray Dirichlet BC for eigenvalue solvers
EigenDirichletBCDirichlet BC for eigenvalue solvers
FunctionDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-7de3912e-801d-4d75-9247-acd2aaa36f2c");katex.render("u=g(t,\\vec{x})", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-dc88ee2b-f0d0-4475-b7ef-d383206f6232");katex.render("g", element, {displayMode:false,throwOnError:false});$ is a (possibly) time and space-dependent MOOSE Function.
FunctionGradientNeumannBCImposes the integrated boundary condition arising from integration by parts of a diffusion/heat conduction operator, and where the exact solution can be specified.
FunctionNeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-b5b0c97d-2e11-408e-882d-18ee6b4c55b9");katex.render("\\frac{\\partial u}{\\partial n}=h(t,\\vec{x})", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-11ae879b-228b-4b8d-8ef1-89295be2a664");katex.render("h", element, {displayMode:false,throwOnError:false});$ is a (possibly) time and space-dependent MOOSE Function.
FunctionPenaltyDirichletBCEnforces a (possibly) time and space-dependent MOOSE Function Dirichlet boundary condition in a weak sense by penalizing differences between the current solution and the Dirichlet data.
HFEMDirichletBCImposes the Dirichlet BC with HFEM.
LagrangeVecDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-a3ca344c-c76c-48ab-b06a-9256a9cd23d9");katex.render("\\vec{u}=\\vec{g}", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-3b77bc90-ed59-4feb-a808-26002ab3aec7");katex.render("\\vec{g}", element, {displayMode:false,throwOnError:false});$ are constant, controllable values.
LagrangeVecFunctionDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-85bd0a8e-3cfa-4af9-8352-b9d0b7ef7e0f");katex.render("\\vec{u}=\\vec{g}", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-37eaf42b-3af5-453b-b477-ad0419e84469");katex.render("\\vec{g}", element, {displayMode:false,throwOnError:false});$ components are calculated with functions.
MatNeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-03627911-800f-48b2-9ada-2aaba6908a3d");katex.render("\\frac{C \\partial u}{\\partial n}=M*h", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-7e4ce9bb-8ebb-43fe-855a-717726c13f9c");katex.render("h", element, {displayMode:false,throwOnError:false});$ is a constant, $var element = document.getElementById("moose-equation-6f12711a-647f-4179-9634-bb3908de492e");katex.render("M", element, {displayMode:false,throwOnError:false});$ is a material property, and $var element = document.getElementById("moose-equation-2197f9e6-ad78-4551-a25e-373af455bdf7");katex.render("C", element, {displayMode:false,throwOnError:false});$ is a coefficient defined by the kernel for $var element = document.getElementById("moose-equation-53101e74-b509-4a7c-a01a-fc2efe22ee60");katex.render("u", element, {displayMode:false,throwOnError:false});$ .
MatchedValueBCImplements a NodalBC which equates two different Variables' values on a specified boundary.
NeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-39386387-7966-4204-b062-e1ff188cedf7");katex.render("\\frac{\\partial u}{\\partial n}=h", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-693ebea3-3ef7-4717-b600-ff007c8aff4b");katex.render("h", element, {displayMode:false,throwOnError:false});$ is a constant, controllable value.
OneDEqualValueConstraintBCComputes the integral of lambda times dg term from the mortar method (for two 1D domains only).
PenaltyDirichletBCEnforces a Dirichlet boundary condition in a weak sense by penalizing differences between the current solution and the Dirichlet data.
PostprocessorDirichletBCDirichlet boundary condition with value prescribed by a Postprocessor value.
PostprocessorNeumannBCNeumann boundary condition with value prescribed by a Postprocessor value.
SinDirichletBCImposes a time-varying essential boundary condition $var element = document.getElementById("moose-equation-389b1b47-efa2-42fe-8f61-329755a1b654");katex.render("u=g(t)", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-2a0c6141-aaff-405e-846e-fc38a2d3cee3");katex.render("g(t)", element, {displayMode:false,throwOnError:false});$ varies from an given initial value at time $var element = document.getElementById("moose-equation-c7370290-7410-4198-a41b-5b0ca700eee4");katex.render("t=0", element, {displayMode:false,throwOnError:false});$ to a given final value over a specified duration.
SinNeumannBCImposes a time-varying flux boundary condition $var element = document.getElementById("moose-equation-c8955745-6c84-4499-82fa-4a8a5e565374");katex.render("\\frac{\\partial u}{\\partial n}=g(t)", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-bf51ebe7-fc83-4f6f-9014-a36d715d05d0");katex.render("g(t)", element, {displayMode:false,throwOnError:false});$ varies from an given initial value at time $var element = document.getElementById("moose-equation-d71ab15c-9864-45b7-84b1-47835e54329d");katex.render("t=0", element, {displayMode:false,throwOnError:false});$ to a given final value over a specified duration.
VacuumBCVacuum boundary condition for diffusion.
VectorCurlPenaltyDirichletBCEnforces a Dirichlet boundary condition for the curl of vector nonlinear variables in a weak sense by applying a penalty to the difference in the current solution and the Dirichlet data.
VectorDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-acef9a41-f6f6-452b-9906-18a5de009c19");katex.render("\\vec{u}=\\vec{g}", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-39a2e8c0-aa51-42c0-991b-8d727aba3a0d");katex.render("\\vec{g}", element, {displayMode:false,throwOnError:false});$ are constant, controllable values.
VectorFunctionDirichletBCImposes the essential boundary condition $var element = document.getElementById("moose-equation-86525bc6-1a91-401c-b73d-2fecd07df71f");katex.render("\\vec{u}=\\vec{g}", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-1d5cc77c-a481-4f77-ad9a-47cfada738d1");katex.render("\\vec{g}", element, {displayMode:false,throwOnError:false});$ components are calculated with functions.
VectorNeumannBCImposes the integrated boundary condition $var element = document.getElementById("moose-equation-07ce4549-4970-4a80-8929-84a52082a231");katex.render("\\frac{\\partial u}{\\partial n}=\\vec{V}\\cdot\\hat{n}", element, {displayMode:false,throwOnError:false});$ , where $var element = document.getElementById("moose-equation-75922861-6fa8-4086-a45b-d46800dc6f92");katex.render("\\vec{V}", element, {displayMode:false,throwOnError:false});$ is a user-defined, constant vector.
VectorPenaltyDirichletBCEnforces a Dirichlet boundary condition for vector nonlinear variables in a weak sense by applying a penalty to the difference in the current solution and the Dirichlet data.
WeakGradientBCComputes a boundary residual contribution consistent with the Diffusion Kernel. Does not impose a boundary condition; instead computes the boundary contribution corresponding to the current value of grad(u) and accumulates it in the residual vector.
Heat Conduction App
ADConvectiveHeatFluxBCConvective heat transfer boundary condition with temperature and heat transfer coefficent given by material properties.
ADFunctionRadiativeBCBoundary condition for radiative heat exchange where the emissivity function is supplied by a Function.
ADInfiniteCylinderRadiativeBCBoundary condition for radiative heat exchange with a cylinderwhere the boundary is approximated as a cylinder as well.
ConvectiveFluxFunctionDetermines boundary value by fluid heat transfer coefficient and far-field temperature
ConvectiveHeatFluxBCConvective heat transfer boundary condition with temperature and heat transfer coefficent given by material properties.
CoupledConvectiveFlux
CoupledConvectiveHeatFluxBCConvective heat transfer boundary condition with temperature and heat transfer coefficent given by auxiliary variables.
FunctionRadiativeBCBoundary condition for radiative heat exchange where the emissivity function is supplied by a Function.
GapHeatTransferTransfers heat across a gap between two surfaces dependent on the gap geometry specified.
GrayLambertNeumannBCThis BC imposes a heat flux density that is computed from the GrayLambertSurfaceRadiationBase userobject.
HeatConductionBC
InfiniteCylinderRadiativeBCBoundary condition for radiative heat exchange with a cylinderwhere the boundary is approximated as a cylinder as well.
Tensor Mechanics App
ADPressureApplies a pressure on a given boundary in a given direction
ADTorqueApply a moment as tractions distributed over a surface around a pivot point. This should operate on the displaced mesh for large deformations.
CoupledPressureBCApplies a pressure from a variable on a given boundary in a given direction
DashpotBC
DisplacementAboutAxisImplements a boundary condition that enforces rotationaldisplacement around an axis on a boundary
InteractionIntegralBenchmarkBCImplements a boundary condition that enforces a displacement field around a crack tip based on applied stress intensity factors.
PenaltyInclinedNoDisplacementBCPenalty Enforcement of an inclined boundary condition
PresetAccelerationPrescribe acceleration on a given boundary in a given direction
PresetDisplacementPrescribe the displacement on a given boundary in a given direction.
PresetVelocity
PressureApplies a pressure on a given boundary in a given direction
StickyBCImposes the boundary condition $var element = document.getElementById("moose-equation-15bb01c8-c44e-498f-8d3f-0f74862937ec");katex.render("u = u_{old}", element, {displayMode:false,throwOnError:false});$ if $var element = document.getElementById("moose-equation-4e738571-1c80-405d-9717-132d16bdb789");katex.render("u_{old}", element, {displayMode:false,throwOnError:false});$ exceeds the bounds provided
TorqueApply a moment as tractions distributed over a surface around a pivot point. This should operate on the displaced mesh for large deformations.

Available Subsystems

Moose App
Periodic
Tensor Mechanics App
CavityPressure
CoupledPressure
InclinedNoDisplacementBC
Pressure

Available Actions

Moose App
AddBCActionAdd a BoundaryCondition object to the simulation.

Available Objects
Available Subsystems
Available Actions