Mesh domain size independancy check

k.vimalakanthan · May 23, 2011, 09:20

Hi guys,

I was hoping someone could give me an answer to my problem. I'm trying to check for domain size independency, but do not have a valid way to go about addressing this problem. I am aware that for mesh refinement study number of authors have suggested the Richardson’s extrapolation method. However I have been told that Mesh domain size convergence is not carried out the same way.

Hence could someone please suggest the best way to compare three different size meshes? I.e. for an airfoil simulation, the extent of the domains varies as 10chord, 20chord and 40chord, keeping the number of nodes constant.

Thanks in advance.

praveen · May 23, 2011, 10:37

You want to test dependance on domain size. Then you should not change the grid, but you should simply extend it. E.g., you do a computation with domain radius r1. Then extend domain size by adding more layers of mesh to reach a higher radius r2. Note that mesh within radius r1 does not change this way.

If you using structured grid, you could generate mesh with largest domain size. Then remove outer layers of mesh to get mesh for smaller domain size.

May 23, 2011, 09:20	Mesh domain size independancy check	#1
k.vimalakanthan Member Kisorthman Vimalakanthan Join Date: Apr 2011 Posts: 46 Rep Power: 15	Hi guys, I was hoping someone could give me an answer to my problem. I'm trying to check for domain size independency, but do not have a valid way to go about addressing this problem. I am aware that for mesh refinement study number of authors have suggested the Richardson’s extrapolation method. However I have been told that Mesh domain size convergence is not carried out the same way. Hence could someone please suggest the best way to compare three different size meshes? I.e. for an airfoil simulation, the extent of the domains varies as 10chord, 20chord and 40chord, keeping the number of nodes constant. Thanks in advance. __________________ Kisorthman Vimalakanthan Dept. of Power and Propulsion Cranfield University Email: k.vimalakanthan@gmail.com

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May 23, 2011, 10:37		#2
praveen Super Moderator Praveen. C Join Date: Mar 2009 Location: Bangalore Posts: 342 Blog Entries: 6 Rep Power: 18	You want to test dependance on domain size. Then you should not change the grid, but you should simply extend it. E.g., you do a computation with domain radius r1. Then extend domain size by adding more layers of mesh to reach a higher radius r2. Note that mesh within radius r1 does not change this way. If you using structured grid, you could generate mesh with largest domain size. Then remove outer layers of mesh to get mesh for smaller domain size.