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Realizable k-epsilon model for cavity flows

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Old   September 24, 2010, 09:20
Default Realizable k-epsilon model for cavity flows
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Srinivasan
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hi!!!! m' working on study over cavity flows. m' trying to simulate the cavity unsteady flows using Realizable k-epsilon model with enhanced wall treatment as it has superior performance involving flow rotations and recirculation. i've tried with all other turbulence models, the results were not satisfactory. during iterations using Realizable k-epsilon model m' gettng some message as "Turbulence viscosity limited to 1e-5". i have tried with differnt types of intensity and viscosity ratios in the inlet boundary condition panel. the problem is not solved. There must be some other conditions for Realizable K-epsilon model which m' missing. i need some assistance in this regard. All the conditions for using Realizable k-epsilon is also expected. The y+ value near the wall for my model is 6.4.
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Old   September 27, 2010, 04:06
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Mohsin Mukhtar
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You wont get this message if you change the limits of Turbulent visocisty ratio.

Go to Fluent--->Solve...>Controls....>Limits...>maximum Turbulent Intensity ratio....(Increase this to say 10^9) You can increase to the point where u will not get this error.

Hope this helps.
Mohsin
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