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Old   April 4, 2014, 05:25
Default Regarding simulation of 360 degree geometry
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Ahirekar Prasanna P
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Hii guys,
I am trying to mesh 360 degree geometry of a combustor but due to compexities involved in that I am not able to mesh it with required quality.I have meshed the 20 degree sector with required quality so is there any option by which I can rotate this 20 degree sector mesh to get complete 360 degree mesh.
Thank you in advance
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Old   April 8, 2014, 01:21
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Vimalraj
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can you tell me which software are you using?
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Old   April 8, 2014, 01:43
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Ahirekar Prasanna P
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Hii,
I am using ICEM CFD and unstructured mesh for the mesh generation
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Old   April 8, 2014, 02:05
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Vimalraj
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Hi prasanna,

I dont have any experience on ICEM CFD. Try posting it in ansys meshing forum, you may get an answer.
I have been using GridPro, which is a structured grid generation software, where it has an option to mesh a sector of the grid and generate the 360 degree grid. If it is not very urgent, you can try it out.
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Old   April 8, 2014, 02:09
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Vimalraj
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Why do you need to get the complete grid? cant you use the periodic boundary conditions for the simulation?
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Old   April 8, 2014, 03:06
Thumbs up ICEM CFD Periodic Meshing
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Praveen Kumar R
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Hi prasanna,

Creating mesh for a sector of geometry and rotating it to get a complete 360deg mesh, is very much possible in ICEM CFD. I am assuming you have confirmed that the geometry is rotationally periodic for 20 deg, but the flow physics is not periodic.

Make sure you do the following steps:

  • Before Creating Mesh: In the Mesh tab, in Global Mesh Setup / Parameters, under Set up Periodicity option, define Rotational periodicity for 20 deg (for ur case)
  • Create two separate part names for the periodic surfaces eg: Suction-side; Pressure-side (or) side-1; side-2
  • Compute Mesh : The usual way you follow to create unstructured geometry
  • After creating mesh, run Check Mesh for 'Periodic problems', by selecting the two periodic surfaces. This option is available under Edit Mesh tab. ICEM should give a message of No periodic problems found. This is to ensure both the periodic sides have same mesh nodes, so that after rotating they can be merged.
  • You can copy rotate the sector mesh using Transform Mesh under Edit Mesh tab, with 17 copies (for ur case) ON & Merge nodes & Delete Duplicate elements ON and 20 deg angle
  • Finally in the complete mesh, you have an option of deleting surface mesh on the periodic surfaces or setting a interior boundary condition in the Solver.
Hope this will help. All the best !!!

Happy Learning!!!
Praveen Kumar R

Last edited by praveen@cfd-online.com; April 8, 2014 at 10:27.
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Old   April 12, 2014, 09:34
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Ahirekar Prasanna P
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I was trying to do so but ting the mesh whenafter computing the mesh when I am looking for periodic problems mesh it shows that no periodicity has been defined in the mesh so please help in this respect
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