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limited turbulent viscosity

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Old   December 21, 2004, 14:37
Default limited turbulent viscosity
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ahourri
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Hi all and happy hollidays: My problem is this : --Step 1: helium gas injection during 1 mn into a large cylinder filled with air at atmospheric pressure. The model is turbulent,compressible, time step 0.1 s. --Step 2: Stop helium injection and monitor helium equilibrium with air inside the cylinder during 250mn. During this step, along with the residuals , I monitor the average facelet velocity. For the fisrt few sconds , eveything was fine, afterwards, I have this message displayed : TURBULENT VISCOSITY LIMITED TO VISCOSITY RATIO OF 10E5. I changed the time step from 0.1s to 1s to 5s to 10s and I still have this message displayed. Am I doing something wrong, should the underrelaxation factor be pretty low or should I set an even bigger time step. Thanx for your help
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Old   December 26, 2004, 12:29
Default Re: limited turbulent viscosity
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emre
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Hi,

Search the archive, there is quite a lot messages posted on this subject..

Regards,

Emre
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