CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Turbulence length scale (http://www.cfd-online.com/Forums/fluent/86591-turbulence-length-scale.html)

Leonpolou March 27, 2011 19:00

Turbulence length scale
 
Hi fellows,

I am simulating the flow past a 3D wing using k-omega in order to compare results with an experimentation made with the S2MA ONERA wind tunnel. As the ONERA didn't specify anything concerning the turbulence factor, we need to estimate it.
The Fluent User guide give some indication dealing with the turbulence factor but I still have some trouble using it. My questions are the following

-Is it the same to use either Turbulence intensity/Turbulence scale factor or k/omega? It seems so when having a look to the solution initialization, but I want to be sure ..
-For the turbulence length scale, I am using the formula which gives us turbulence based on the boundary layer thickness introduce at the inlet.The boundary layer thickness has to be the laminar or the turbulent one?

Those questions were dealing with a pressure far field

Now, how do we actually define the turbulence near a wall?

I hope my questions are clear enough for you to give me some clues.

Many thanks
leon

micro11sl November 30, 2011 11:22

Quote:

Originally Posted by Leonpolou (Post 301173)
Hi fellows,

I am simulating the flow past a 3D wing using k-omega in order to compare results with an experimentation made with the S2MA ONERA wind tunnel. As the ONERA didn't specify anything concerning the turbulence factor, we need to estimate it.
The Fluent User guide give some indication dealing with the turbulence factor but I still have some trouble using it. My questions are the following

-Is it the same to use either Turbulence intensity/Turbulence scale factor or k/omega? It seems so when having a look to the solution initialization, but I want to be sure ..
-For the turbulence length scale, I am using the formula which gives us turbulence based on the boundary layer thickness introduce at the inlet.The boundary layer thickness has to be the laminar or the turbulent one?

Those questions were dealing with a pressure far field

Now, how do we actually define the turbulence near a wall?

I hope my questions are clear enough for you to give me some clues.

Many thanks
leon


Did you solve your problem eventually?

malik January 23, 2013 07:26

malik
 
Hi,

Can anyone plz send me the 3D mesh of ONERA M6 wing that i can open in ICEM. I need both coarse and fine mesh. I am in urgent need. My email is s.malik.eng@gmail.com

Many thanks in advance


All times are GMT -4. The time now is 00:05.