Volumetric Mesh and Boundary Condition Help

mini_samurai · April 12, 2020, 20:18

Hey

I'm trying to create a fluid domain for my sim with custom volumetric controls to cut down computation time. I have 3 cuboidal volumes of decreasing size, each with increasingly finer meshes inside each other to simulate air flow over a complex blunt body.
The meshes themselves are fine and look good however i am having troube with my regions and boundaries. I have looked at the tutorials in the STAR CCM+ manual but cant quite get it since the air does not flow inside the other volumes.
I want to have a single stangation inlet and pressure outlet on the outermost volume and have the boundaries of the finer meshes not affect the flow of the air however i can't get this to work. I dont know if it's because i have set up the regions wrong or my parts (and surfaces). Currently i have a region for each volume(part) plus one for my blunt body.

If anyone knows how to do this please let me know asap.

Thanks
Alex

nalamyogesh · April 14, 2020, 05:12

May be you could a picture of your problem. Hope your interfaces are well created between your regions.

me3840 · April 14, 2020, 20:51

You do not need 1 region for each volume. You should only have 1 region for them all. Use a volumetric control and your cuboidal volumes to control the mesh size. It's probably best for you to review the meshing tutorials, as I'm sure this concept is covered.

April 12, 2020, 20:18	Volumetric Mesh and Boundary Condition Help	#1
mini_samurai New Member Alex Join Date: Apr 2020 Posts: 1 Rep Power: 0	Hey I'm trying to create a fluid domain for my sim with custom volumetric controls to cut down computation time. I have 3 cuboidal volumes of decreasing size, each with increasingly finer meshes inside each other to simulate air flow over a complex blunt body. The meshes themselves are fine and look good however i am having troube with my regions and boundaries. I have looked at the tutorials in the STAR CCM+ manual but cant quite get it since the air does not flow inside the other volumes. I want to have a single stangation inlet and pressure outlet on the outermost volume and have the boundaries of the finer meshes not affect the flow of the air however i can't get this to work. I dont know if it's because i have set up the regions wrong or my parts (and surfaces). Currently i have a region for each volume(part) plus one for my blunt body. If anyone knows how to do this please let me know asap. Thanks Alex

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April 14, 2020, 05:12		#2
nalamyogesh Member Yogesh Nalam Join Date: Sep 2012 Location: München, Germany Posts: 54 Rep Power: 13	May be you could a picture of your problem. Hope your interfaces are well created between your regions.

April 14, 2020, 20:51		#3
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	You do not need 1 region for each volume. You should only have 1 region for them all. Use a volumetric control and your cuboidal volumes to control the mesh size. It's probably best for you to review the meshing tutorials, as I'm sure this concept is covered.