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

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Trackbacks are Off Pingbacks are On Refbacks are On Forum Rules

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Turbulence Models for very low Reynolds Numbers	Sudhi	CFX	1	March 2, 2007 19:03
Free surface boudary conditions with SOLA-VOF	Fan	Main CFD Forum	10	September 9, 2006 13:24
Turbulent Flat Plate Validation Case	Jonas Larsson	Main CFD Forum	0	April 2, 2004 11:25
FLUENT for low pressure case	Jim	FLUENT	1	March 30, 2004 13:11
Body force - Does it work?	Jan Rusås	CFX	5	August 27, 2002 10:50

All times are GMT -4. The time now is 13:47.