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September 20, 2015, 09:01 |
how to choose turbulence model?
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#1 |
New Member
Reza
Join Date: Jun 2012
Posts: 27
Rep Power: 14 |
Hi,
I am wondering if anyone knows references in which explains how to choose the proper turbulence model based on the model description. for example, I am interested to know when I should change from k-epsilon to LES or maybe for a problem I have LES is an overkill. I usually start with k-epsilon realizable but I do not know how I can know before hand which method is the most proper one based on the characteristics of my case. I appreciate if anyone can send me references if there is any since I couldnt find any myself. most of the links I find are describing the turbulence model details rather when to use a specific model. tanx |
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September 20, 2015, 15:07 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,849
Rep Power: 73 |
Quote:
the answer you are looking for depends on the flow problem and on what is the goal of the simulation... (U)RANS -> DES-> LES -> DNS from left to right is the formulation you can adopt and the more at left you stay, the lesser are the resolved details in the solution and greatest is the effect of the turbulence model. You can have a look to some textbooks, for example Wilcox as well as the book of Pope |
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September 21, 2015, 01:42 |
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#3 |
Member
Jingchang.Shi
Join Date: Aug 2012
Location: Hang Zhou, China
Posts: 78
Rep Power: 14 |
I got some tips at this forum, But I forget which thread it is.
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September 21, 2015, 04:13 |
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#4 | |
New Member
Surya
Join Date: Jan 2014
Posts: 20
Rep Power: 12 |
Quote:
http://jullio.pe.kr/fluent6.1/help/html/ug/node402.htm http://www.innovative-cfd.com/turbulence-models.html |
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September 24, 2015, 15:49 |
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#5 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,747
Rep Power: 66 |
It may be difficult to choose between models within a class (say k-epsilon versus k-omega) but the choice should never be difficult between a RANS model compared to LES. A better question is how much turbulence modelling do you want to do?
Quote:
The choice is similar to asking whether you want to invest in penny stocks or NASDAQ/DOW. |
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Tags |
k-epsilon, les, turbulence |
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