Regarding simulation of 360 degree geometry
 

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

can you tell me which software are you using?

Hii,
I am using ICEM CFD and unstructured mesh for the mesh generation

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.

Why do you need to get the complete grid? cant you use the periodic boundary conditions for the simulation?

ICEM CFD Periodic Meshing
 

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

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