ParsedSubdomainMeshGenerator

Uses a parsed expression (combinatorial_geometry) to determine if an element (via its centroid) is inside the region defined by the expression and assigns a new block ID.

Example

The desired example mesh is a 1-by-1 2D square which contains Block 1 (a centered 0.8-by-0.8 square) and Block 2 (a 0.4-by-0.4 square located in the bottom left quarter of Block 1). The remaining edge of the square can be Block 0.

The combinatorial expression that defines Block 1 is below.


x > 0.1 & x < 0.9 & y > 0.1 & y < 0.9

The expression


x < 0.5 & y < 0.5

can partially define Block 2, but the region outside Block 1 also needs to be excluded. The input file syntax needed to generate this example is shown below.

[Mesh]
  [./gmg]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 10
    ny = 10
    xmax = 1
    ymax = 1
    uniform_refine = 2
  []

  [./subdomains]
    type = ParsedSubdomainMeshGenerator
    input = gmg
    combinatorial_geometry = 'x > 0.1 & x < 0.9 & y > 0.1 & y < 0.9'
    block_id = 1
  []

  [./subdomains2]
    type = ParsedSubdomainMeshGenerator
    combinatorial_geometry = 'x < 0.5 & y < 0.5'
    excluded_subdomain_ids = '0'
    block_id = 2
    input = subdomains
  []
[]

The final mesh output is:

Input Parameters

block_idSubdomain id to set for inside of the combinatorial
C++ Type:unsigned short
Controllable:No
Description:Subdomain id to set for inside of the combinatorial
combinatorial_geometryFunction expression encoding a combinatorial geometry
C++ Type:std::string
Controllable:No
Description:Function expression encoding a combinatorial geometry
inputThe mesh we want to modify
C++ Type:MeshGeneratorName
Controllable:No
Description:The mesh we want to modify

Required Parameters

block_nameSubdomain name to set for inside of the combinatorial
C++ Type:SubdomainName
Controllable:No
Description:Subdomain name to set for inside of the combinatorial
constant_expressionsVector of values for the constants in constant_names (can be an FParser expression)
C++ Type:std::vector<std::string>
Controllable:No
Description:Vector of values for the constants in constant_names (can be an FParser expression)
constant_namesVector of constants used in the parsed function
C++ Type:std::vector<std::string>
Controllable:No
Description:Vector of constants used in the parsed function
excluded_subdomainsA set of subdomain ids that will not changed even if they are inside/outside the combinatorial geometry
C++ Type:std::vector<SubdomainName>
Controllable:No
Description:A set of subdomain ids that will not changed even if they are inside/outside the combinatorial geometry

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.
disable_fpoptimizerFalseDisable the function parser algebraic optimizer
Default:False
C++ Type:bool
Controllable:No
Description:Disable the function parser algebraic optimizer
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:No
Description:Set the enabled status of the MooseObject.
enable_ad_cacheTrueEnable caching of function derivatives for faster startup time
Default:True
C++ Type:bool
Controllable:No
Description:Enable caching of function derivatives for faster startup time
enable_auto_optimizeTrueEnable automatic immediate optimization of derivatives
Default:True
C++ Type:bool
Controllable:No
Description:Enable automatic immediate optimization of derivatives
enable_jitTrueEnable just-in-time compilation of function expressions for faster evaluation
Default:True
C++ Type:bool
Controllable:No
Description:Enable just-in-time compilation of function expressions for faster evaluation
evalerror_behaviornanWhat to do if evaluation error occurs. Options are to pass a nan, pass a nan with a warning, throw a error, or throw an exception
Default:nan
C++ Type:MooseEnum
Options:nan, nan_warning, error, exception
Controllable:No
Description:What to do if evaluation error occurs. Options are to pass a nan, pass a nan with a warning, throw a error, or throw an exception
save_with_nameKeep the mesh from this mesh generator in memory with the name specified
C++ Type:std::string
Controllable:No
Description:Keep the mesh from this mesh generator in memory with the name specified

Advanced Parameters

nemesisFalseWhether or not to output the mesh file in the nemesisformat (only if output = true)
Default:False
C++ Type:bool
Controllable:No
Description:Whether or not to output the mesh file in the nemesisformat (only if output = true)
outputFalseWhether or not to output the mesh file after generating the mesh
Default:False
C++ Type:bool
Controllable:No
Description:Whether or not to output the mesh file after generating the mesh
show_infoFalseWhether or not to show mesh info after generating the mesh (bounding box, element types, sidesets, nodesets, subdomains, etc)
Default:False
C++ Type:bool
Controllable:No
Description:Whether or not to show mesh info after generating the mesh (bounding box, element types, sidesets, nodesets, subdomains, etc)

Debugging Parameters

(../moose/test/tests/meshgenerators/parsed_subdomain_mesh_generator/parsed_subdomain_mg.i)

[Mesh]
  [./gmg]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 10
    ny = 10
    xmax = 1
    ymax = 1
    uniform_refine = 2
  []

  [./subdomains]
    type = ParsedSubdomainMeshGenerator
    input = gmg
    combinatorial_geometry = 'x > 0.1 & x < 0.9 & y > 0.1 & y < 0.9'
    block_id = 1
  []

  [./subdomains2]
    type = ParsedSubdomainMeshGenerator
    combinatorial_geometry = 'x < 0.5 & y < 0.5'
    excluded_subdomain_ids = '0'
    block_id = 2
    input = subdomains
  []
[]

[Outputs]
  exodus = true
[]