Can Gmsh create deformed prism? and how to? and partially hexahedralize?
Hello, first, I'm really appreciated for this wonderful program.
I'm Doctor's degree student working on magnetotelluric survey modeling. So, what I'm doing is making local earth model and modeling Maxwell's equations by FEM.
Recently, my studying area contains very shallow sea, compared to its total area. I attached simple model for test.
In the model, volume2 is the sea. As mentioned, this is just simple test model. The final model will be larger and contain shallower sea.
If I tetrahedralize the model, it will contain huge amount of tetrahedron in order to preserve mesh quality. So I think prism element is the best choice for the sea part (than hexahedral) because I have to apply sea bottom topography from DEM data and triangles are better than quadrangles (all nodes are co-planer automatically).
However, when I tested the simple model, the mesh contains only the ill-shaped tetrahedron and pyramids. (also, error messages are printed) In my case, I can't use extrusion method because of the complex topography. I can't figure out how to make prisms without using extrusion. (not the regular one, deformed-shape prisms)
Also, it would be best if I can discretize some part of the model that I want into tetrahedron (+pyramid, prisms) and other into hexahedron
So I wonder that
- can Gmsh create irregular prisms
- can Gmsh recombine specified volume (not total model)