why different models lead to different result for a same low-Re RAS case? -- CFD Online Discussion Forums

December 10, 2012, 03:59	why different models lead to different result for a same low-Re RAS case?	#1
Sunxing Member sqing Join Date: Sep 2012 Location: Dalian Posts: 77 Rep Power: 14	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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