DGConvection

DG upwinding for the convection

The velocity vector is a constant, so this may not be used for solving for the velocity in fluid simulations for example. This kernel is only for advecting a field with a known velocity. The first order upwind scheme used is diffusive and will only provide first order mesh convergence.

More information about the discontinuous Galerkin method may be found in the DGKernels syntax page.

Example input syntax

In this example, a field u is advected from a boundary condition on its left to the right boundary with a 1 0 0 velocity using the ADDGConvection, the version of this kernel with automatic differentiation.

[DGKernels]
  [convection]
    type = ADDGConvection
    variable = u
    velocity = '1 0 0'
  []
[]

Input Parameters

variableThe name of the variable that this residual object operates on
C++ Type:NonlinearVariableName
Controllable:No
Description:The name of the variable that this residual object operates on
velocityVelocity vector
C++ Type:libMesh::VectorValue<double>
Controllable:No
Description:Velocity vector

Required Parameters

blockThe list of blocks (ids or names) that this object will be applied
C++ Type:std::vector<SubdomainName>
Controllable:No
Description:The list of blocks (ids or names) that this object will be applied
boundaryThe list of boundaries (ids or names) from the mesh where this boundary condition applies
C++ Type:std::vector<BoundaryName>
Controllable:No
Description:The list of boundaries (ids or names) from the mesh where this boundary condition applies
diag_save_inThe name of auxiliary variables to save this Kernel's diagonal Jacobian contributions to. Everything about that variable must match everything about this variable (the type, what blocks it's on, etc.)
C++ Type:std::vector<AuxVariableName>
Controllable:No
Description:The name of auxiliary variables to save this Kernel's diagonal Jacobian contributions to. Everything about that variable must match everything about this variable (the type, what blocks it's on, etc.)
exclude_boundaryThe internal side sets to be excluded from this kernel.
C++ Type:std::vector<BoundaryName>
Controllable:No
Description:The internal side sets to be excluded from this kernel.
prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Controllable:No
Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
save_inThe name of auxiliary variables to save this Kernel's residual contributions to. Everything about that variable must match everything about this variable (the type, what blocks it's on, etc.)
C++ Type:std::vector<AuxVariableName>
Controllable:No
Description:The name of auxiliary variables to save this Kernel's residual contributions to. Everything about that variable must match everything about this variable (the type, what blocks it's on, etc.)

Optional 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:Yes
Description:Set the enabled status of the MooseObject.
implicitTrueDetermines whether this object is calculated using an implicit or explicit form
Default:True
C++ Type:bool
Controllable:No
Description:Determines whether this object is calculated using an implicit or explicit form
seed0The seed for the master random number generator
Default:0
C++ Type:unsigned int
Controllable:No
Description:The seed for the master random number generator
use_displaced_meshFalseWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.
Default:False
C++ Type:bool
Controllable:No
Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

Advanced Parameters

extra_matrix_tagsThe extra tags for the matrices this Kernel should fill
C++ Type:std::vector<TagName>
Controllable:No
Description:The extra tags for the matrices this Kernel should fill
extra_vector_tagsThe extra tags for the vectors this Kernel should fill
C++ Type:std::vector<TagName>
Controllable:No
Description:The extra tags for the vectors this Kernel should fill
matrix_tagssystemThe tag for the matrices this Kernel should fill
Default:system
C++ Type:MultiMooseEnum
Options:nontime, system
Controllable:No
Description:The tag for the matrices this Kernel should fill
vector_tagsnontimeThe tag for the vectors this Kernel should fill
Default:nontime
C++ Type:MultiMooseEnum
Options:nontime, time
Controllable:No
Description:The tag for the vectors this Kernel should fill

Tagging Parameters

(../../../SoftwareDownloads/moose/test/tests/dgkernels/ad_dg_convection/ad_dg_convection.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 20
  xmax = 20
[]

[Variables]
  [u]
    family = MONOMIAL
    order = CONSTANT
  []
[]

[Kernels]
  [time]
    type = TimeDerivative
    variable = u
  []
[]

[DGKernels]
  [convection]
    type = ADDGConvection
    variable = u
    velocity = '1 0 0'
  []
[]

[BCs]
  [left]
    type = PenaltyDirichletBC
    value = 1
    penalty = 1e6
    boundary = 'left'
    variable = u
  []
[]

[Executioner]
  type = Transient
  solve_type = NEWTON
  num_steps = 10
  dt = 1
  dtmin = 1
[]

Example input syntax
Input Parameters