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#1 |
Senior Member
Stuart
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 739
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Hi,
It is known that RANS linear eddy viscosity models; e.g. k-epsilon and k-omega based models, can have difficulty accurately predicting bluff body flows and that hybrid RANS-LES are preferred, see the ANSYS SRS Guide. However, for those of us that lack the computational resources to run hybrid RANS-LES models has it been shown that Reynolds Stress Models give more accurate prediction that RANS EVM models for bluff body flows? I've read that often EVM and RSM give very similar results and that it's not worth solving the extra RSM equations which are tougher to converge. Thanks |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
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In my experience RSM does not give much better results than 2 eqn models for bluff body flows. Where RSM makes a big difference is in rotating flows. But really you should try this for yourself and compare a k-e, SST, RSM and RANS-LES model and see the difference. If you don't have enough computer resources to do a RANS-LES model then simplify the model. Things like the Ahmed body has lots of published data and is simple enough that hopefully you can model it, even with RANS-LES.
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