# LevelSetBiMaterialReal

Compute a Real material property for bi-materials problem (consisting of two different materials) defined by a level set function.

## Description

A level set function can represent the location of the interface between two material domains, which in general could have different material properties. A system has been developed to evaluate the proper models for a given material in such a system. This system operates by evaluating the material properties for both materials at every point, and then selecting the property appropriate for a given point.

This switching between material properties is done based on the LevelSetBiMaterialBase model, which selects between the material properties that are defined for the level set positive domain and negative domain respectively, based on the sign of the level set field. This material, LevelSetBiMaterialReal, is used to switch two Real material properties. The switching of Rank-2 and Rank-4 tensors material properties are implemented as LevelSetBiMaterialRankTwo and LevelSetBiMaterialRankFour, respectively.

## Example Input File Syntax


[./diff_combined]
type = LevelSetBiMaterialReal
levelset_positive_base = 'A'
levelset_negative_base = 'B'
level_set_var = ls
prop_name = diffusion_coefficient
[../]
(modules/xfem/test/tests/moving_interface/moving_diffusion.i)

## Input Parameters

• level_set_varThe name of level set variable used to represent the interface

C++ Type:VariableName

Options:

Description:The name of level set variable used to represent the interface

• prop_nameName for the computed material property.

C++ Type:std::string

Options:

Description:Name for the computed material property.

• levelset_negative_baseBase name for the material in level set negative region.

C++ Type:std::string

Options:

Description:Base name for the material in level set negative region.

• levelset_positive_baseBase name for the material in level set positive region.

C++ Type:std::string

Options:

Description:Base name for the material in level set positive region.

### Required Parameters

• boundaryThe list of boundary IDs from the mesh where this boundary condition applies

C++ Type:std::vector

Options:

Description:The list of boundary IDs from the mesh where this boundary condition applies

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

Default:True

C++ Type:bool

Options:

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

• 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

• base_nameBase name for the computed material property (optional)

C++ Type:std::string

Options:

Description:Base name for the computed material property (optional)

### Optional Parameters

• enableTrueSet the enabled status of the MooseObject.

Default:True

C++ Type:bool

Options:

Description:Set the enabled status of the MooseObject.

• 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.

• 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.

• seed0The seed for the master random number generator

Default:0

C++ Type:unsigned int

Options:

Description:The seed for the master random number generator

• 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

• 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 computeSubdomainProperties() 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

Options:NONE ELEMENT SUBDOMAIN

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 computeSubdomainProperties() for the 0th quadrature point, and then copy that value to the other qps. Evaluations on element qps will be skipped

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

C++ Type:std::vector

Options:

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

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

Default:none

C++ Type:std::vector

Options:

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