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November 2, 2010, 11:24 |
Question Regarding Turbulence Numerics
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New Member
Stephen
Join Date: Mar 2010
Posts: 21
Rep Power: 16 |
Hello, after being a Fluent user for the past 10 years I have made the jump to use CFX for the past 6 months since this is the software the company I now work for uses. I have found that all CFD models that are run here use only 1st order turbulence numerics. I was told that version 10 did not have a high resolution option and basically they haven't tried the high resolution and felt that the results would not change much if high resolution was used. We now use version 12. The CFD work we deal with the most is turbine blades. So, we do have a highly turbulent swirling flow. We use the SST option with automatic wall functions. My argument is that since most of the meshes are tets with prism layer that using high resolution is paramount to achieve a better accurate solution over 1st order turbulence. Unless, bear in mind convergence issues. I am having a very difficult time convincing senior and management engineers here to go forth and use high resolution. Any ideas? Also, are there any studies out there comparing CFX's 1st order and high resolution turbulence numerics and also if there are any CFX vs. Fluent turbulence comparisons? Thanks
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