[timotie87]

I am trying to set up a rotational periodic mesh in ICEM. I have a simple half cylinder domain, and would like to set up the mesh so that faces A1 and A2 are conforming, similar with B1 and B2. I have done these steps:

1. Global Mesh Setup > Set up Periodicity
2. Rotational Periodic
3. Base: 0 0 0, Axis 0 0 1, Sectors 2 (for 180 degree)

I am making a unstructured mesh, using the Quick (Delaunay), but the resulting mesh does not produce conforming meshes on these surfaces. Any suggestions?

[syavash]

Originally Posted by timotie87

I am trying to set up a rotational periodic mesh in ICEM. I have a simple half cylinder domain, and would like to set up the mesh so that faces A1 and A2 are conforming, similar with B1 and B2. I have done these steps:

1. Global Mesh Setup > Set up Periodicity
2. Rotational Periodic
3. Base: 0 0 0, Axis 0 0 1, Sectors 2 (for 180 degree)

I am making a unstructured mesh, using the Quick (Delaunay), but the resulting mesh does not produce conforming meshes on these surfaces. Any suggestions?

Hi Tim,

I have also faced the exactly same issue! I produce mesh using Delauny method with rotational periodic boundaries, but when I check in Fluent, it tells me that the surface mesh does not match between two!

Did you manage to find a solution?

Kind regards,
syavash

[timotie87]

Originally Posted by syavash

Hi Tim,

I have also faced the exactly same issue! I produce mesh using Delauny method with rotational periodic boundaries, but when I check in Fluent, it tells me that the surface mesh does not match between two!

Did you manage to find a solution?

Kind regards,
syavash

Hello Syavash,

Yes, I was able to solve my problem somewhat. The Delauny method is not able to produce a rotational symmetric mesh by itself. My workaround was to use the Robust Octree method to create the volume mesh and accompanying surface mesh. I then smoothed the mesh to a quality I was happy with, and then deleted all of the volume elements. This left me with a rotational periodic surface mesh of my domain with no volume mesh. I then remade the volume mesh with the Delauny method, making sure to select "Existing Mesh" in the input. This will use the periodic surface mesh and make a nice Delauny volume mesh to go with it. Make sure to check the periodicity before and after the volume meshing. Hope this works for you like it did for me... let me know!

Cheers,
Tim

[syavash]

Originally Posted by timotie87

Hello Syavash,

Yes, I was able to solve my problem somewhat. The Delauny method is not able to produce a rotational symmetric mesh by itself. My workaround was to use the Robust Octree method to create the volume mesh and accompanying surface mesh. I then smoothed the mesh to a quality I was happy with, and then deleted all of the volume elements. This left me with a rotational periodic surface mesh of my domain with no volume mesh. I then remade the volume mesh with the Delauny method, making sure to select "Existing Mesh" in the input. This will use the periodic surface mesh and make a nice Delauny volume mesh to go with it. Make sure to check the periodicity before and after the volume meshing. Hope this works for you like it did for me... let me know!

Cheers,
Tim

Hi Tim,

Thanks for your thorough explanation. I think I figured out how to do it. Only one point I have doubt about.
I have defined the periodicity in the Global mesh parameters. However, when I check the periodicity by doing right-click on the mesh tree, nothing is added to the screen!
Further, I guess smoothing the surface mesh is also possible without the volume mesh (delete the latter first)?
I appreciate your valuable help.

Regards
syavash

[timotie87]

Yes, delete the volume mesh elements first, and the smooth the remaining surface mesh.