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How to create matching mesh zones so that periodic boundary can be created in Fluent

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Old   February 26, 2016, 13:39
Default How to create matching mesh zones so that periodic boundary can be created in Fluent
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Carson
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I am meshing a geometry in Star-CCM+, exporting the mesh to a Tecplot and importing the Tecplot into ANSYS Fluent. The issue I am having is that I need to create matching zones on the sides of my mesh so that when the mesh is imported into Fluent I can successfully create a periodic boundary between the two zones. If the zones do not match perfectly then the periodic boundary can not be created in Fluent.

So far I have tried creating a periodic interface in Star-CCM+ and remeshing but the zones still do not match when I do that. Is there any other way to mesh so the zones match each other?
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Old   February 26, 2016, 15:04
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Why are you meshing in star-ccm and exporting to fluent? Why not run with star-ccm?
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Old   February 28, 2016, 10:52
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Quote:
Originally Posted by MBdonCFD View Post
Why are you meshing in star-ccm and exporting to fluent? Why not run with star-ccm?
This happens fairly often actually. Because historically Fluent did not have it's own meshing utility, and the Star-CCM mesher has some neat things it can do as well. On the other hand, Fluent has more solver options (even though it has fewer meshing options). Finally, it's great for benchmarking Star-CCM vs Fluent results.

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Originally Posted by cgoodale1 View Post
So far I have tried creating a periodic interface in Star-CCM+ and remeshing but the zones still do not match when I do that. Is there any other way to mesh so the zones match each other?
Does this mean that meshing failed? You need the periodic zones to match in Star-CCM before your export it to Fluent.

Are you using some options like per-region meshing which does not produce matched interfaces?

Also play with your meshing criteria to see if you can get a matched boundary.

Alternatively, you could do a non-conformal interface, but I do not recommend this approach at all.
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Old   February 29, 2016, 12:34
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The meshing did not fail but when I created an interface on the surfaces that I wanted to match there were still different numbers of elements on each face. I am not using per-region meshing. I mesh the one region as a whole. I have played with the criteria but have not had any luck yet. Could it be the approach that I am using when I create an interface between the two regions?
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matching tolerance, matching zones, periodic boundary

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