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

cgoodale1 · February 26, 2016, 14:39

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?

fluid23 · February 26, 2016, 16:04

Why are you meshing in star-ccm and exporting to fluent? Why not run with star-ccm?

LuckyTran · February 28, 2016, 11:52

Quote:

Originally Posted by MBdonCFD

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.

Quote:

Originally Posted by cgoodale1

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.

cgoodale1 · February 29, 2016, 13:34

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?

February 26, 2016, 14:39	How to create matching mesh zones so that periodic boundary can be created in Fluent	#1
cgoodale1 New Member Carson Join Date: Feb 2016 Posts: 2 Rep Power: 0	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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February 26, 2016, 16:04		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	Why are you meshing in star-ccm and exporting to fluent? Why not run with star-ccm?

February 29, 2016, 13:34		#4
cgoodale1 New Member Carson Join Date: Feb 2016 Posts: 2 Rep Power: 0	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?