# One equation eddy

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 July 12, 2010, 16:33 One equation eddy #1 Senior Member   Rickard Join Date: May 2010 Location: Lund, Skåne, Sweden Posts: 143 Rep Power: 8 If I change the turbulenceproperties from RAS to LES the one equation eddy model (sth like that) is solved. I tried looking at the code but can someone tell me in words how it works ? Thx

 July 13, 2010, 23:03 #2 Senior Member   wayne.zhang Join Date: Mar 2009 Location: Shanghai, Shanghai, P.R.China Posts: 307 Rep Power: 10 there are two examples in pisoFoam

 July 14, 2010, 04:52 #3 New Member   Join Date: Jun 2010 Posts: 23 Rep Power: 8 Hi Rickard, Even if I cannot explain you exactly this model, you could find some help in the following threads : # First thread (4 pages, must see) # Second thread, shorter but still relevant # Eugene's thesis Hope it helps

 July 14, 2010, 05:28 #4 Senior Member   Rickard Join Date: May 2010 Location: Lund, Skåne, Sweden Posts: 143 Rep Power: 8 I mean of course how the one equation eddy is solved, not how it is implemented

March 31, 2011, 16:36
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 Originally Posted by Rickard.Solsjo I mean of course how the one equation eddy is solved, not how it is implemented

I have same question.

 April 1, 2011, 02:20 #6 Senior Member   Rickard Join Date: May 2010 Location: Lund, Skåne, Sweden Posts: 143 Rep Power: 8 Norbert is right, just read Eugene's thesis. Basically, the subgrid scale (eddy) viscosity comes into some of the terms in the governing equation. To solve this, the eddy viscosity is modeled similarly as in the smagorinsky case but with a subgrid scale turbulent kinetic energy which is solved with another transport equation. Something like nu(sgs)=C(nu)sqrt(K(sgs))*filterwidth. Just look at eugenes thesis

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