Transparent boundaries IIΒΆ

Learning targets

  • Transparent boundary conditions
  • Inhomogeneous exterior domain

This example contains a 2D layout with transparent boundaries on all faces of the computational domain. The lower part of the computational domain contains a layered structure. Note that JCMgeo automatically extends this layered structure to the exterior domain. I.e., this geometry models a single object placed on a layered structure which extends to infinity.

The resulting geometry and mesh correspond to the following figure:

_images/snapshot_120.png

.jcm Input File

  • layout.jcm [ASCII]

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    Layout2D {
  Name = "TutorialExample2D"
  UnitOfLength = 1e-06

  MeshOptions {
    MinimumMeshAngle = 20
    MaximumSideLength = 1.5
  }
Objects {  
  Polygon { 
    Name = "ComputationalDomain/Background" 
    DomainId = 1 
    Priority = -1 
    Points = [-3 -3, 3 -3, 3 3, 0 3.5, -3 3] 
    Boundary { 
      Class = Transparent
    } 
  } 
  Polygon {  
    Name = "Object"  
    DomainId = 2 
    Priority = 1 
    Points = [-1 -1, 1 -1, 1 1, 0 0, -1 1]
    MeshOptions {  
      MaximumSideLength = 0.6 
    }
  } 
  Polygon {  
    Name = "Layer1"  
    DomainId = 3 
    Priority = 1 
    Points = [-3 -1.2, 3 -1.2, 3 -1, -3 -1] 
  } 
  Polygon {  
    Name = "Layer2"  
    DomainId = 4 
    Priority = 1 
    Points = [-3 -1.8, 3 -1.8, 3 -1.2, -3 -1.2] 
  } 
  Polygon {  
    Name = "Layer3"  
    DomainId = 5 
    Priority = 1 
    Points = [-3 -3, 3 -3, 3 -1.8, -3 -1.8] 
  } 
}