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 December 3, 2007, 07:00 LES #1 John Deas Guest   Posts: n/a Sponsored Links I would like to study decay of vortices structures behind a vortex generator at Re_bulk=5000 in a plain channel, isn't LES a bit of an overkill there ?

 December 3, 2007, 18:27 Re: LES #2 pankaj saha Guest   Posts: n/a hi, i also work on LES. But what exactly, your problem is? Can you tell?

 December 4, 2007, 08:51 Re: LES #3 John Deas Guest   Posts: n/a I would like to quantify the viscous dissipation of the structures behind the winglet and link it with the heat transfer. I would like to compare stationnary RANS and non stationnary calculations.

 December 4, 2007, 18:00 Re: LES #4 pankaj saha Guest   Posts: n/a which type of winglet u are using...delta wing or winglet pair....Which paper you would like to compare , related to RANS?

 December 7, 2007, 00:37 Re: LES #5 agg Guest   Posts: n/a If I understant correctly, your Re_bulk is not very high. Can you not attempt a DNS? If DNS resolution requirements are too high, I think attempting LES is quite reasonable. If you could explain why you think LES for this is an overkill, I might be able to explain better.

 December 7, 2007, 04:37 Re: LES #6 John Deas Guest   Posts: n/a I want mainly to compare with "Heat transfer in a rectangular channel with a vee-shaped vortex generator" by Sohankar. However, I have a single delta winglet while he have two. He uses dns and LES, and found the results comparables.

 December 7, 2007, 04:38 Re: LES #7 John Deas Guest   Posts: n/a I thought LES was interesting for high Reynolds numbers (more than 10000), but for less, RANS and URANS might be sufficient.

 December 7, 2007, 18:08 Re: LES #8 agg Guest   Posts: n/a Yes that is correct. So, with the present computational power, computing DNS for your case should not be much effort, don't you think?

 December 25, 2007, 17:18 Re: LES #9 pankaj saha Guest   Posts: n/a hi, For the winglet problem....Do, anyone need to satisfy Y+=1 around the winglet body also? as near the wall it must be a criterion for les? Can anyone tell what is the reason?

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