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-   -   why different models lead to different result for a same low-Re RAS case? (http://www.cfd-online.com/Forums/openfoam/110375-why-different-models-lead-different-result-same-low-re-ras-case.html)

Sunxing December 10, 2012 03:59

why different models lead to different result for a same low-Re RAS case?
 
Hi foamers,

I am simulating a 2D channel flow using pisoFoam solver.

At the beginning, I used the LaunderSharmaKE model to solve the case and I got a good reslut. Then I calculated the y+, u+ and u_tau() using plusPostRANSUtility downloaded in the thread---"y+ and u+ values with low-Re RANS turbulence models: utility +testcase" However, the u_tau is higher than the value from the counterpart experiment. So I changed the model to LienLeschzinerLowRe to get a better result. However,the result didn't get better but worse than the former one.

Now I want to know what are the factors that make the different reslut.
Thanks for any reply.

Sunxing


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