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-   -   CFX meshing aspect ratio problems (http://www.cfd-online.com/Forums/cfx/81992-cfx-meshing-aspect-ratio-problems.html)

akash_morar November 12, 2010 11:35

CFX meshing aspect ratio problems
 
Trying to mesh a wind tunnel in the CFX mesher and am getting warnings of aspect ratios greater than 50. What are acceptable aspect ratios for the mesh and how would i make it smaller.

Thanks

ghorrocks November 13, 2010 05:35

This is discussed in the CFX documentation, I think under obtaining convergence.

dada1204 November 13, 2010 09:49

mesh aspect ratio
 
the acceptable range of mesh aspect ratio is below 100.

ghorrocks November 13, 2010 23:41

The actual number depends on the flow you are simulating and where the element is in the flow. 100:1 is OK for single phase in the boundary layer adjacent to a wall where the flow is aligned with the element, but even 2:1 is not good enough for accurate surface tension models. I find sweeping statements like this useless.

Really you need to do a sensitivity study on it for your application. But if you describe the application we might be able to give you some tips based on our experience.


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