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Old   June 19, 2006, 03:42
Default Warning while fluent simulation
  #1
Madhukar Rapaka
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hi

while running a FLUENT simulation i am getting the following message: Turbulent viscosity is limited to viscosity ratio of XXXXXX in XX(say 79) cells. And this number is decreasing as the iterations are going forward. what would be the problem.

thanks in advance

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Old   June 19, 2006, 05:14
Default Re: Warning while fluent simulation
  #2
Gernot
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If the number of the cells are decreasing and the warning disappears it should be no problem. Maybe your initial - conditions were not set good.

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Old   June 19, 2006, 06:43
Default Re: Warning while fluent simulation
  #3
Michael Bo Hansen
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Search this forums for previous threads on the subject.
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Old   June 19, 2006, 07:50
Default Re: Warning while fluent simulation
  #4
Madhukar Rapaka
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thanks for the response.

the warning diminishes as the iteration no. increases, but after some time it reappears with the TURBULENCE VISCOSITY is limited to VISCOSITY RATIO 1.0e+05 in 1 cell. Can this be negligible.

thanks in advance
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Old   June 20, 2006, 01:21
Default Re: Warning while fluent simulation
  #5
Rajeev Kumar Singh
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using adaptive meshing divide that cell
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Old   June 20, 2006, 02:03
Default Re: Warning while fluent simulation
  #6
Madhukar Rapaka
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Thanks for the response Rajeev,

As i am new to Fluent how to do this. If u don't mind can explain the procedure.

thanks in advance
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Old   June 20, 2006, 03:05
Default Re: Warning while fluent simulation
  #7
Rajeev Kumar Singh
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Go to adaption and mark the cell which is having the high tu viscosity and click adapt. It will ask for hanging node adaption. Click ok and the cell will be divided into 8 in 3d and 4 in 2d. Run for few more iterations and see whether the messages vanish. Generally this happens in regions of high gradient where you have sufficiently large cells which cannot capture the gradient properly. Using adaptive mesh refinements helps in reducing the mesh size in regions of interest. You can look up for the same in the help also.
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Old   June 20, 2006, 03:29
Default Re: Warning while fluent simulation
  #8
Madhukar Rapaka
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thank u rajeev
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Old   June 21, 2006, 04:18
Default Re: Warning while fluent simulation
  #9
Madhukar Rapka
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Hi Rajeev,

Sorry to bother u again,but how to mark the cell with Turulent viscosity ratio...is it possible to select with the mouse or how... please let me know

thanks in advance
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