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January 12, 2014, 04:12 |
the level of LES now?
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#1 |
Member
garry
Join Date: Oct 2013
Posts: 41
Rep Power: 12 |
hello,
i am new in les. My teacher ask me what is the level of LES now, what Renolds? and can it use in complex boundary conditions now? thank u very much! |
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January 13, 2014, 15:21 |
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#2 |
Member
Join Date: Jun 2011
Posts: 51
Rep Power: 14 |
Hi yzeyue,
Your question is quite vague. There are plenty of books regarding turbulence modelling that may help you. LES is essentially a simulation that directly solves the large scale motion but approximates the small scale. Through the LES model u can resolve all large turbulent strucutres up to the available grid limit. The small structures are modelled, by imposing a filter method, SGS. There are plenty of subgrig scale models. BTW, LES simulation are usually quite expensive. U can find: Purely LES models (quite expensive within BL) Hybrid ones (RANS within BL) and LES outside of it which reduce a lot the computation costs (very often referred as Wall modelled LES). As u can see, it can be quite interesting this turbulence model which became one of the most appellative with the advent of high performance computers! What u mean by saying complex boundaries? AFAIK u can deal with any type of BC's as in RANS! Regards |
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January 15, 2014, 04:41 |
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#3 | |
Member
garry
Join Date: Oct 2013
Posts: 41
Rep Power: 12 |
Quote:
I majored in axile compressor, and my teacher hope that I can learn and use LES in the compressor's optimization. I do not know how high is the Reynold can be done now. Thx! |
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January 15, 2014, 04:45 |
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#4 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,768
Rep Power: 71 |
for LES of compressible flows, you can find some help in the book of Sagaut
http://www.springer.com/physics/theo...-90-481-2818-1 |
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