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[ICEM] ansys icem tetra mesh to fluent_v6 conversion problems

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Old   May 2, 2010, 04:33
Exclamation ansys icem tetra mesh to fluent_v6 conversion problems
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Vasu
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Hi all,

I have a tetra mesh with prism layers generated in Ansys ICEM, I've attached a picture below.

Now when I use fluent_v6 solver to export the mesh so I can use it for my simulation in OpenFOAM. It converts the mesh, but skips the parts, INLET, OUTLET and ROTSYMM2. Also it creates shadow faces instead of the ROTSYMM2 part. Basically ROTSYMM1 and ROTSYMM2 are the sides of the grid that are periodic.

To explain a bit more, the grid is periodic and axisymmetric and it is a wedge of 5 degrees part of a cylindrical set up. I have set the rotational periodicity in the global mesh set up part.

Any help on how to get all the parts required for my boundary definition would be very welcome!
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File Type: jpg mesh_full_view.jpg (46.2 KB, 19 views)
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Old   May 3, 2010, 17:09
Default Do you have elements in those parts...
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Simon Pereira
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It looks like it is saying you have no elements in those parts (not referenced by grid)... if you just display the inlet and outlet parts (in the model tree) and try to show shell elements, what do you see?

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Old   May 3, 2010, 18:51
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Hello,

First thank you for your reply.

When I switch off everything except the relevant parts and switch on shell elements, I see the shells on the parts as in the shell mesh. And it has triangles and quads, most of the elements on these two parts are quads with about 2 elements being triangles I think.

How do I proceed? Any suggestions?

Thank you again for your time.

Best,
Vasu
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Old   May 4, 2010, 01:14
Default Hmm?
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Simon Pereira
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Sorry, I can't tell from here. I have never had this problem.

Has it ever worked for you?

Did you do anything different with those parts? Did you setup BOCO's for them? Usually, I select fluentV6 as my solver and then setup my inlet and outlet, I leave everything else alone so it defaults to wall.

If you didn't do that... Try it... If you did do that, then maybe that doesn't work with OpenFoam (I have not tried OpenFoam), in which case, don't do that. Leave everything as default (walls) and try it that way.
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Old   May 4, 2010, 03:45
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Hello again,

I have tried something similar before and it worked. I'm attaching a picture below, the difference is that this time I have these "gap regions" in between. Other than that nothing has changed.

About the BOCOs, I'm trying to run an axi-symmetric case in OpenFOAM. For this I need to define a symmetryPlane (AXIS) and the front and back planes (ROTSYMM1 and ROTSYMM2) as periodic. This is what I'm doing in Ansys ICEM with the "output-BC" tab.

So I think I could try others with default wall but I need to define the periodic walls otherwise upon importing to OpenFOAM the periodic alignments wont be exported as well.

Any ideas of how else I could do this?

Cheers again for your time and patience.

Best,
Vasu
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Old   May 20, 2010, 15:55
Default Conclusion
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Ok, just to close out this thread... (from a while back)

The problem was that the extra lugs were not properly connected and so the mesh generated was not properly connected.

Millenium_01.jpg

In the end, we fixed the geometry, quad meshed one side and extruded it (rotation 5 degrees about the axis) to get the final mesh.

Millenium_02.jpg
Millenium_03.jpg


The inlet and outlet were setup as the curve parts so that the extruded line elements would become the shells for the bocos...

An even better mesh could easily be obtained by blocking this model. In this case, I started with a 2D Blocking and extruded it to get the final 3D blocking.
Millenium_04.gif
Millenium_07_OGrid2.jpg
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