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June 19, 2012, 14:16 |
A flow to verify a SGS model
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#1 |
New Member
Jun Han
Join Date: Jun 2012
Posts: 5
Rep Power: 13 |
Hi guys:
I am trying to verify my implementation of a LES model, I need a simple and well studied flow case to do that. I try to use channel flow, however, because the code use octree mesh scheme which make the total cell number unaffordable. any suggestions? |
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June 19, 2012, 14:29 |
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#2 |
Senior Member
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There are a lot of test cases available, depending on the aspect you want to check. Homogeneous isotropic turbulence (Comte-Bellot & Corrsin experiment) is a classical one. Also you can look for the Taylor-Green Vortex. They both allow you to test your LES code without the burden of the near wall issue and have a lot of reference LES/DNS solutions.
A general collection of LES test cases can be found in: http://torroja.dmt.upm.es/turbdata/agard/ |
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June 19, 2012, 14:33 |
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#3 | |
New Member
Jun Han
Join Date: Jun 2012
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Quote:
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June 19, 2012, 14:46 |
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#4 |
Senior Member
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If you check the agard document above (from page 129) you will find several experimental and numerical cases for the mixing layer. Moreover, Vreman (http://www.vremanresearch.nl/) has surely worked on this topic but i don't know if the database is available (probably not).
However, the HIT and TGV test cases require full 3D periodicity (3 directions are more than 1, i guess). Still, i don't get the point in having Octrees and being limited by boundary conditions. It's probably me missing it |
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June 19, 2012, 14:50 |
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#5 | |
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Jun Han
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June 19, 2012, 15:45 |
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#6 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,760
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As already suggested, isotropic/homogeneous turbulence and channel flow are a MUST for any new SGS modelling. You cannot avoid to check for performance in such test-cases
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June 19, 2012, 16:36 |
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#7 | |
Senior Member
cfdnewbie
Join Date: Mar 2010
Posts: 557
Rep Power: 20 |
Quote:
I second that, I have yet to see a SGS model that has not been tested against Taylor Green or HIT....both flows have been studied very extensively.... any chance you could fix the periodic bcs??? in fact, they are the easiest one to implement of all bcs, so maybe you can talk to the programmers / vendors... |
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