Gmsh format reader for restart etc.
Posted: 17 Aug 2020, 14:22
Hi All,
We faced a need to couple several geometrically ordered parts hierarchically. In order to not be limited to conforming meshes in the interpolation among the different parts we must use some format that comes with the FE mesh as well.
Instead of using some existing Elmer format we opted this time for Gmsh format (current only version 2.0) for which we already had a simple output writer. The good thing in using Gmsh format is that it is widely used and there is a visualisation tool that can deal with it. VTU could also be considered but it would be much harder to read in natively.
So now there is also a very simple tentative Gmsh reader. As for now, it was only meant for this simple case but I could imagine there being further development avenues.
The only test case so far is "Outlet2InletBC". From there one can see how to write Gmsh results
and then read them in the next simulation the provide BCs
We are open for comments and ideas.
-Peter
We faced a need to couple several geometrically ordered parts hierarchically. In order to not be limited to conforming meshes in the interpolation among the different parts we must use some format that comes with the FE mesh as well.
Instead of using some existing Elmer format we opted this time for Gmsh format (current only version 2.0) for which we already had a simple output writer. The good thing in using Gmsh format is that it is widely used and there is a visualisation tool that can deal with it. VTU could also be considered but it would be much harder to read in natively.
So now there is also a very simple tentative Gmsh reader. As for now, it was only meant for this simple case but I could imagine there being further development avenues.
The only test case so far is "Outlet2InletBC". From there one can see how to write Gmsh results
Code: Select all
Solver 2
Exec Solver = after all
Equation = "GmshOutput"
Procedure = "ResultOutputSolve" "ResultOutputSolver"
Output Directory = "."
Output File Name = case_a.msh
Gmsh Format = Logical True
Scalar Field 1 = temperature
End
Code: Select all
Solver 2
Exec Solver = before simulation
Equation = "GmshReader"
Procedure = "GmshOutputReader" "GmshOutputReader"
Output Directory = "."
Filename = File "case_a.msh"
! This makes the interpolation only to dofs where "Inlet" is set True.
Mask Name = "Inlet BC"
End
Boundary Condition 4
...
Inlet BC = Logical True
...
We are open for comments and ideas.
-Peter