How to merge special mesh in ICEM CFD?
 

I am simulating blood flow. The vessel has lots of complex branches. I hope to mesh the branch region with tetra and prism grid near the vessel wall. For the straight vessel region I want to mesh with hexa and o-grid.

I know without prism grid, it is easy to merge tetra and hexa. But when I merge tetra with prism and hexa with o-grid, ICEM CFD reports some errors.

So what to do next? I also wonder what the best grid is to mesh blood vessel?

Thank you

Because of prism, it is difficult to merge the two. I will go for tetra all over your geometry, check the hexa-core option it can help you get a structured domain inside.

TETRA/PRISM vs HEXA
 

Hi.

There is one possibility to get an 1:1 connection between a Hexa and a Tet/Prism mesh.

You have to use ANSYS Meshing (from ANSYS Workbench). You specify a Tetrahedral /Patch independet meshing for the hexa meshed body and change from the method the option "Write ICEM CFD File" to "Interactive". Also change "ICEM CFD Behavior" to "Override Method".

After that, if you mesh the body, ICEM CFD appears automatically. Now you have to import you blocking and update your associations. Every point and every curve of the geometry has to be associated to a vertex or edge.

When you have transformed to your unstructured mesh, you have to save the project and close ICEM CFD. After that, the mesh is imported to ANSYS Meshing.
The rest of the geometry can be meshed with the Patch Conforming Tetra mesher of the workbench, also using inflation layers.

If you have further questions, continue this blog and I can try to help you. It's not so easy to do that.

Regards,
Jan



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Jan Smedseng
CFX Berlin Software GmbH