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]

     1Layout2D {
 2  Name = "TutorialExample2D"
 3  UnitOfLength = 1e-06
 4
 5  MeshOptions {
 6    MinimumMeshAngle = 20
 7    MaximumSideLength = 1.5
 8  }
 9Objects {  
10  Polygon { 
11    Name = "ComputationalDomain/Background" 
12    DomainId = 1 
13    Priority = -1 
14    Points = [-3 -3, 3 -3, 3 3, 0 3.5, -3 3] 
15    Boundary { 
16      Class = Transparent
17    } 
18  } 
19  Polygon {  
20    Name = "Object"  
21    DomainId = 2 
22    Priority = 1 
23    Points = [-1 -1, 1 -1, 1 1, 0 0, -1 1]
24    MeshOptions {  
25      MaximumSideLength = 0.6 
26    }
27  } 
28  Polygon {  
29    Name = "Layer1"  
30    DomainId = 3 
31    Priority = 1 
32    Points = [-3 -1.2, 3 -1.2, 3 -1, -3 -1] 
33  } 
34  Polygon {  
35    Name = "Layer2"  
36    DomainId = 4 
37    Priority = 1 
38    Points = [-3 -1.8, 3 -1.8, 3 -1.2, -3 -1.2] 
39  } 
40  Polygon {  
41    Name = "Layer3"  
42    DomainId = 5 
43    Priority = 1 
44    Points = [-3 -3, 3 -3, 3 -1.8, -3 -1.8] 
45  } 
46}