I am trying to mesh a non-cubic volume using hexa elements. GiD says it can only be meshed by thetra elements. I am wondering if any way to solve this issue?
I also attached my gid file.
Basin model4.gid.zip (257 KB)
In general, it is not possible to mesh with GiD a volume with hexahedra. This is only possible for the specific cases of structured or semi-structured meshes.
To mesh a geometry structured all volumes must be topologically like a cube: with exactly 6 surfaces.
Your initial geometry has a volume of 4 surfaces: it is possible to divide 2 of them to have a box-like topology.
This is the GiD model modified to be able to be meshed structuredly
Basin model4_semi-structured.gid.zip (503 KB)
This is an image of a possible structured mesh of hexas
(note that its shape could become too distorted)
To mesh a geometry semi-structured the volumes must have two opposite surfaces, with exactly the same amount of curves, and these surfaces must be joined laterally by surfaces of 4 curves exactly.
This is the GiD model modified to be able to be meshed semi-structuredly (joining some lines)
Basin model4_structured.gid.zip (546 KB)
This is an image of a possible semi-structured mesh of hexas
