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turbulent viscosity limited to ...???

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Old   February 21, 2006, 14:56
Default turbulent viscosity limited to ...???
  #1
alexandre
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Hello,

I am trying to simulate an axisymmetric body with an unstructured mesh (3d,coupled imp, S-A). Fluent works with 1000 iterations and after 165 iterations, the text says : "turbulent viscosity limited to viscosity ratio of 1.e+05 in (n+1) cells" The simulation continues with this phrase for each iteration

Do you think that's modified the results of my simulation?

Thank you for your help...

Alexandre.
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Old   February 21, 2006, 15:25
Default Re: turbulent viscosity limited to ...???
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Jason
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This has been discussed in detail on this forum. Basically comes down to Boundary conditions or mesh. In my experience it's usually the mesh. Do a search of the forum ("turbulent viscosity ratio" or "TVR") for more details.

Good luck, Jason
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Old   February 22, 2006, 00:22
Default Re: turbulent viscosity limited to ...???
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Ravi Kiran
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One wAy to handle this problem is by refining the grid at boundaries by hanging node method in Flunet i.e. adaptive boundary gradients with respect to y+ and reduce the Y+ value to half after every 100 or 200 iterations
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