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-   -   DES and LES meshing: tips and advice? (http://www.cfd-online.com/Forums/fluent/45121-des-les-meshing-tips-advice.html)

James M June 21, 2007 09:57

DES and LES meshing: tips and advice?
 
Hello,

I'd like to enquire if any of you can advise me on a tutorial or guidelines on grid generation for DES and LES problems. I understand the meshing is different than RANS, more complex and delicate so I turn to all the great scientists and engineers of the forum for some help! I mainly intend to use GridGen, Gambit and FLUENT.

Thank you in advance.

James

Thandavam June 21, 2007 10:53

Re: DES and LES meshing: tips and advice?
 
Hi,

As far commercial codes are concerned meshing does not follow any global rules. There are some thumb rules which one can develop thro' experience. other wise meshing must go with validating the simulated results with exp results. First attempt give a try with the coarse grid and see the results. Then go further increasing the number nodes till you get grid independent solution.

Hope this helps

Thandavan


Dave June 21, 2007 11:09

Re: DES and LES meshing: tips and advice?
 
It is not possible to obtain a mesh independent solution for LES/DES - unless you have gone past having the refinement required for a DNS solution.

Sham June 24, 2007 20:22

Re: DES and LES meshing: tips and advice?
 
Dave,

Can you explain about DNS pls. How can I model in DNS? Can I do it in FLUENT?

Sham.


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