MatDiffusion

Diffusion equation Kernel that takes an isotropic Diffusivity from a material property

Implements the term where the diffusion coefficient (diffusivity) is provided by a FunctionMaterial function material (see Phase Field Module for more information), is the non-linear variable the kernel is operating on.

This kernel can be used in a coupled form if the optional v variable is specified. This allows applying the diffusion operator to a variable given by v, which is different from the kernel variable.

can depend on arbitrary non-linear variables (args). The complete Jacobian contributions are provided by the kernel. To build the Jacobian the kernel uses all derivatives of with respect to the kernel variable and the variables specified in args.

Input Parameters

  • variableThe name of the variable that this Kernel operates on

    C++ Type:NonlinearVariableName

    Options:

    Description:The name of the variable that this Kernel operates on

Required Parameters

  • argsOptional vector of arguments for the diffusivity. If provided and diffusivity is a derivative parsed material, Jacobian contributions from the diffusivity will be automatically computed

    C++ Type:std::vector

    Options:

    Description:Optional vector of arguments for the diffusivity. If provided and diffusivity is a derivative parsed material, Jacobian contributions from the diffusivity will be automatically computed

  • blockThe list of block ids (SubdomainID) that this object will be applied

    C++ Type:std::vector

    Options:

    Description:The list of block ids (SubdomainID) that this object will be applied

  • concDeprecated! Use 'v' instead

    C++ Type:std::vector

    Options:

    Description:Deprecated! Use 'v' instead

  • diffusivityDThe diffusivity value or material property

    Default:D

    C++ Type:MaterialPropertyName

    Options:

    Description:The diffusivity value or material property

  • displacementsThe displacements

    C++ Type:std::vector

    Options:

    Description:The displacements

  • vCoupled concentration variable for kernel to operate on; if this is not specified, the kernel's nonlinear variable will be used as usual

    C++ Type:std::vector

    Options:

    Description:Coupled concentration variable for kernel to operate on; if this is not specified, the kernel's nonlinear variable will be used as usual

Optional Parameters

  • control_tagsAdds user-defined labels for accessing object parameters via control logic.

    C++ Type:std::vector

    Options:

    Description:Adds user-defined labels for accessing object parameters via control logic.

  • 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

    Options:

    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.)

  • enableTrueSet the enabled status of the MooseObject.

    Default:True

    C++ Type:bool

    Options:

    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

    Options:

    Description:Determines whether this object is calculated using an implicit or explicit form

  • 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

    Options:

    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.)

  • seed0The seed for the master random number generator

    Default:0

    C++ Type:unsigned int

    Options:

    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

    Options:

    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

    Options:

    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

    Options:

    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

    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

    Description:The tag for the vectors this Kernel should fill

Tagging Parameters

Input Files