Hexagonal meshing of a non-box volume?

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payoubi
Posts: 25
Joined: Tue Nov 15, 2016 2:50 am

Hexagonal meshing of a non-box volume?

Postby payoubi » Fri Sep 07, 2018 5:00 am

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.
Attachments
Basin model4.gid.zip
(256.98 KiB) Downloaded 57 times
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escolano
Posts: 1568
Joined: Thu Sep 18, 2014 3:31 pm

Re: Hexagonal meshing of a non-box volume?

Postby escolano » Mon Sep 10, 2018 12:12 pm

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_structured.gid.zip
(546.32 KiB) Downloaded 62 times

This is an image of a possible structured mesh of hexas
mesh_structured.png
mesh_structured.png (24.71 KiB) Viewed 804 times

(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_semi-structured.gid.zip
(502.76 KiB) Downloaded 58 times

This is an image of a possible semi-structured mesh of hexas
mesh_semi_structured.png
mesh_semi_structured.png (38.76 KiB) Viewed 804 times

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