Normal RefinementsΒΆ

Learning targets

  • Use normal mesh refinements to increase mesh density near metal interfaces
  • Stack extrusion layouts
  • Use individual meshing options within each layout

This example consists of brick like scatter, e.g. a metallic particle. For an electromagnetic field simulation the field has has singularity-like profile near the edges and corners of the metallic particle. To account for this we use a fine mesh in the direction of the metallic interface:

_images/ex3d_normal_refinements_mesh.png

We use a stack of layouts to mitigate the mesh requirements outside the metallic region.

.jcm Input File

  • layout.jcm [ASCII]

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    Layout3D {
  UnitOfLength = 1e-09
  
  MeshOptions {
    MaximumSideLength = 50
  }
  Extrusion {
    Objects {
      Polygon { 
        Name = "ComputationalDomain/Background" 
        DomainId = 1
        Priority = -1 
        Points = [-200 -200, 200 -200, 200 200, -200 200] 
        Boundary {
          Class = Periodic
        }
      } 
    }
    MultiLayer {
      MeshOptions {
        MaximumSideLengthZ = 50
      }    
      
      LayerInterface {
        BoundaryClass = Transparent
      }
      Layer {
        Thickness = 100
        DomainId = 1
      }
    }  
  } 
}
Layout3D {
  UnitOfLength = 1e-09
  
  MeshOptions {
    MaximumSideLength = 50
  }
  Extrusion {
    Objects {
      Polygon { 
        Name = "ComputationalDomain/Background" 
        DomainId = 1
        Priority = -1 
        Points = [-200 -200, 200 -200, 200 200, -200 200] 
        Boundary {
          Class = Periodic
        }
      } 
      
      Parallelogram {
        DomainId = 2
        Width = 200
        Height = 200
        MeshOptions {
          NormalRefinement {
            Outer { 
              StartThickness = 5
              TotalThickness = 20
            }
            Inner { 
              StartThickness = 5
              TotalThickness = 20
            }
          }
        }
      }
    }
    MultiLayer {
      MeshOptions {
        MaximumSideLengthZ = 50
      }    
      
      Layer {
        Thickness = 20
        DomainId = 1
        MeshOptions {
          MaximumSideLengthZUpper = 5
        }
      }
      
      Layer {
        Thickness = 20
        DomainIdMapping = [1 2 
                           2 3]
      }
      
      LayerInterface {
        GlobalZ = 0.0
      }
      
      Layer {
        Thickness = 20
        DomainId = 4
        MeshOptions {
          MaximumSideLengthZLower = 10        
        }
      }
    }  
  } 
}
Layout3D {
  UnitOfLength = 1e-09
  
  MeshOptions {
    MaximumSideLength = 50
  }
  Extrusion {
    Objects {
      Polygon { 
        Name = "ComputationalDomain/Background" 
        DomainId = 1
        Priority = -1 
        Points = [-200 -200, 200 -200, 200 200, -200 200] 
        Boundary {
          Class = Periodic
        }
      } 
    }  
    MultiLayer {
      MeshOptions {
        MaximumSideLengthZ = 50
      }    
      
      Layer {
        Thickness = 100
        DomainId = 4
      }
      LayerInterface {
        BoundaryClass = Transparent
      }
    }  
    
  }