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Turbulent viscousity ratio limit

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Old   May 25, 2008, 04:50
Default Turbulent viscousity ratio limit
  #1
rawin
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Hi,everey body. I have a question about the report,Turbulent viscousity ratiıo limmits to ------ in ------ cells.I learnt that changing mesh of model sometimes solves the problem,but I dont know what happens exactly.If anybody know the answer please let me know? regards
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Old   May 25, 2008, 11:31
Default Re: Turbulent viscousity ratio limit
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BastiL
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The warning means that the FLUENT code gets results of turbulent viscosity for soem cells that are higher than the allowed limit (this can be fitted using solve -> solution -> limits or something like this). This warning does not necessarily mean that you have a problem, however if number of cells with acitve limiters increase from iteration to iteration your calculation will probably deverge. Reasons can be insufficent initialisation, some poor quality cells, insufficiant numerical settings or some complex flow areas.

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Old   May 26, 2008, 03:21
Default Re: Turbulent viscousity ratio limit
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Visc Ratio
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Have a look into cfd-online wiki's Fluent FAQ. I think there should be a note about this issue. this is fairly comman question asked here, if you do search you would find postings about it. (In fact I remember writing a long post about it, so do not want to repeat.)
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Old   May 27, 2008, 12:22
Default Re: Turbulent viscousity ratio limit
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rawin
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It was helpfull.Thanks.

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