PolycrystalDiffusivity

Generates a diffusion coefficient to distinguish between the bulk, pore, grain boundaries, and surfaces

The PolycrystalDiffusivity material builds a diffusivity function that distinguishes between the solid and void phases, grain boundaries, and free surfaces, thus allowing different diffusion rates in those regions. The final diffusion function is expressed as:

.

Here, is the bulk diffusion coefficient in the matrix/solid phase, is the diffusion coefficient within the void/pore/bubble phase, is the coefficient for the surface diffusion, and is the coefficient of diffusion along the grain boundaries. The prefactors for the diffusion along various interfaces are chosen such that, , where denotes the diffusivity along the interface (i.e., or ). , , , are the indices to activate different diffusion mechanisms. When the diffusion values in different regions are unknown, replace those with weighted bulk diffusion coefficients.

Input Parameters

  • cVacancy phase variable

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:Vacancy phase variable

  • vArray of coupled variables

    C++ Type:std::vector<VariableName>

    Unit:(no unit assumed)

    Controllable:No

    Description:Array of coupled variables

Required Parameters

  • Dbulk1Diffusion coefficient for volumetric diffusion in solid

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Diffusion coefficient for volumetric diffusion in solid

  • Dgb1Diffusion coefficient for grain boundary diffusion

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Diffusion coefficient for grain boundary diffusion

  • Dsurf1Diffusion coefficient for surface diffusion

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Diffusion coefficient for surface diffusion

  • Dvoid1Diffusion coefficient for diffusion within void/pore/bubble

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Diffusion coefficient for diffusion within void/pore/bubble

  • blockThe list of blocks (ids or names) that this object will be applied

    C++ Type:std::vector<SubdomainName>

    Unit:(no unit assumed)

    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 object applies

    C++ Type:std::vector<BoundaryName>

    Unit:(no unit assumed)

    Controllable:No

    Description:The list of boundaries (ids or names) from the mesh where this object applies

  • bulk_weight1Bulk diffusion weight

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Bulk diffusion weight

  • computeTrueWhen false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the MaterialBase via MaterialBasePropertyInterface::getMaterialBase(). Non-computed MaterialBases are not sorted for dependencies.

    Default:True

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:When false, MOOSE will not call compute methods on this material. The user must call computeProperties() after retrieving the MaterialBase via MaterialBasePropertyInterface::getMaterialBase(). Non-computed MaterialBases are not sorted for dependencies.

  • constant_onNONEWhen ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

    Default:NONE

    C++ Type:MooseEnum

    Unit:(no unit assumed)

    Options:NONE, ELEMENT, SUBDOMAIN

    Controllable:No

    Description:When ELEMENT, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps.When SUBDOMAIN, MOOSE will only call computeQpProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

  • declare_suffixAn optional suffix parameter that can be appended to any declared properties. The suffix will be prepended with a '_' character.

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:An optional suffix parameter that can be appended to any declared properties. The suffix will be prepended with a '_' character.

  • diffusivityDThe name of the diffusion property

    Default:D

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:The name of the diffusion property

  • gb_weight1Grain boundary diffusion weight

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Grain boundary diffusion weight

  • op_numArray of coupled variables (num_name)

    C++ Type:unsigned int

    Unit:(no unit assumed)

    Controllable:No

    Description:Array of coupled variables (num_name)

  • 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

    Unit:(no unit assumed)

    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.

  • solid_switchhmSwitching Function Materials for the solid

    Default:hm

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:Switching Function Materials for the solid

  • surf_weight1Surface diffusion weight

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Surface diffusion weight

  • use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

    Default:False

    C++ Type:bool

    Unit:(no unit assumed)

    Controllable:No

    Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.

  • var_name_baseArray of coupled variables (base_name)

    C++ Type:std::string

    Unit:(no unit assumed)

    Controllable:No

    Description:Array of coupled variables (base_name)

  • void_switchhbSwitching Function Materials for the void

    Default:hb

    C++ Type:MaterialPropertyName

    Unit:(no unit assumed)

    Controllable:No

    Description:Switching Function Materials for the void

  • void_weight1Void diffusion weight

    Default:1

    C++ Type:double

    Unit:(no unit assumed)

    Controllable:No

    Description:Void diffusion weight

Optional Parameters

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

    C++ Type:std::vector<std::string>

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

    Unit:(no unit assumed)

    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

  • output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)

    C++ Type:std::vector<std::string>

    Unit:(no unit assumed)

    Controllable:No

    Description:List of material properties, from this material, to output (outputs must also be defined to an output type)

  • outputsnone Vector of output names where you would like to restrict the output of variables(s) associated with this object

    Default:none

    C++ Type:std::vector<OutputName>

    Unit:(no unit assumed)

    Controllable:No

    Description:Vector of output names where you would like to restrict the output of variables(s) associated with this object

Outputs Parameters

References

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