This page gives some meshes and solutions samples for ViZiR 4 and gives explanations on how to write meshes and/or solutions files for ViZiR 4.
To launch one of this mesh:
vizir4 -in name_of_the_mesh_file Download: P0SolOnTriangle.mesh (the simple mesh) and P0SolOnTriangle.sol (the P0 solution)
To launch this solution on this mesh, use
vizir4 -in P0SolOnTriangle 
Download: P1SolOnTriangle.mesh (the simple mesh) and P1SolOnTriangle.sol (the P1 solution)
To launch this solution on this mesh, use
vizir4 -in P1SolOnTriangle 
Download: P3SolOnTriangle.mesh (the simple mesh) and P3SolOnTriangle.sol (the P3 solution)
To launch this solution on this mesh, use
vizir4 -in P3SolOnTriangle 
To launch one of this mesh:
vizir4 -in name_of_the_mesh_file 
To launch one of this mesh with solution:
vizir4 -in name_of_the_mesh_file -sol name_of_the_sol_file
We present some examples of meshes writing. The format is the Gamma Mesh Format (GMF) and follow the libMeshb format. More information about this format can be found at: https://github.com/LoicMarechal/libMeshb and in the user guide of ViZiR 4.
To sum up, a mesh file is composed of:MeshVersionFormatted 3
Dimension
2
Vertices
3
0.0 0.0 1
1.0 0.0 1
0.0 1.0 1
Triangles
1
1 2 3 1
End
MeshVersionFormatted 3
Dimension
3
Vertices
4
0.0 0.0 0.0 1
1.0 0.0 0.0 1
1.0 1.0 0.0 1
0.0 1.0 0.0 1
Quadrilaterals
1
1 2 3 4 1
End
All the meshes in the Single elements samples section section are in ACSII and give examples for each type of element.
We present how to render different solutions on a simple triangle. The mesh file is given below and is composed of the unit triangle. On the same triangle, 3 solutions are defined hereafter:
MeshVersionFormatted 3
Dimension
2
Vertices
3
0.0 0.0 1
1.0 0.0 1
0.0 1.0 1
Triangles
1
1 2 3 1
EndMeshVersionFormatted 3
Dimension 2
SolAtTriangles
1
1 1
2.0
End
Download: P0SolOnTriangle.mesh (the simple mesh) and P0SolOnTriangle.sol (the P0 solution)
To launch this solution on this mesh, use
vizir4 -in P0SolOnTriangle MeshVersionFormatted 3
Dimension
2
SolAtVertices
3
1 1
2.0
6.0
4.0
End
Download: P1SolOnTriangle.mesh (the simple mesh) and P1SolOnTriangle.sol (the P1 solution)
To launch this solution on this mesh, use
vizir4 -in P1SolOnTriangle MeshVersionFormatted 3
Dimension
2
HOSolAtTrianglesP1
1
1 1
3 10
-1 1 1 1 0 -1 0 1 -1 1
End
Download: P3SolOnTriangle.mesh (the simple mesh) and P3SolOnTriangle.sol (the P3 solution)
To launch this solution on this mesh, use
vizir4 -in P3SolOnTriangle
If we want to use Gauss Lobatto points of degree 3 in a quadrilateral,
where 16 degrees of freedom (see the figure below) are introduced, the keyword
HOSolAtQuadrilateralsQ1NodesPositions is
used.
MeshVersionFormatted 3
Dimension 2
Vertices
4
0 0 1
1 0 1
1 1 1
0 1 1
Quadrilaterals
1
1 2 3 4 1
EndMeshVersionFormatted 3
Dimension 2
HOSolAtQuadrilateralsQ1NodesPositions
16
0.000000 0.000000
0.276393 0.000000
0.723607 0.000000
1.000000 0.000000
0.000000 0.276393
0.276393 0.276393
0.723607 0.276393
1.000000 0.276393
0.000000 0.723607
0.276393 0.723607
0.723607 0.723607
1.000000 0.723607
0.000000 1.000000
0.276393 1.000000
0.723607 1.000000
1.000000 1.000000
HOSolAtQuadrilateralsQ1
1
1 1
3 16
0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0
End
Then, a high-order solution is defined on this quadrilateral:
Using the libMeshb library to write meshes/solutions is by far the best way (in term of performance in particular). In the github of the library, there is an examples directory with several examples to write meshes (some in C, others in Fortran).
Have a look at the gitlab of cgns2meshb, a tool to convert CGNS files to GMF (i.e. .mesh[b], .sol[b]), can be useful as there are functions to write meshes and solutions using the libMeshb library.