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turbulent viscosity problem

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Old   October 6, 2006, 08:22
Default turbulent viscosity problem
  #1
majie023
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In my caculation,it apprears the following information again and again:turbulent viscosity limited to viscosity ratio of 1.000000e+005 in 262718 cells.

And certainly it can't reach convergence even after 600 iterations.What's going wrong with it?
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Old   October 6, 2006, 16:40
Default Re: turbulent viscosity problem
  #2
Neelima
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Hello,

I would recommend you to check whether you have scaled the grid properly when you first read the mesh into Fluent Solver.

Neelima
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Old   October 6, 2006, 21:12
Default Re: turbulent viscosity problem
  #3
majie023
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Thanks for your help.

I am sure I have scaled the grid properly,but the problem still exits.I don't know what to do next.
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Old   October 6, 2006, 21:27
Default Re: turbulent viscosity problem
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zxaar
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initiate the calculation with very low value to k, (default init is 0.1), I usually use 0.0001. In most cases this would solve the problem.
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Old   October 7, 2006, 06:07
Default Re: turbulent viscosity problem
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sam
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as i guess this is problem due to ill posed boundary condition. are u sure abt ur BC?

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Old   October 9, 2006, 04:35
Default Re: turbulent viscosity problem
  #6
sach
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check the following 1) this comes mailny due to mesh quality issue (skewness and aspect ratio) 2) it may go off after few thousand iteration 3)

let me know for any quary sachcool80@gmail.com
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Old   October 11, 2006, 22:40
Default Re: turbulent viscosity problem
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mahendran.n
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hello ,

increase the limit values in the solve menu ... this will solve the problem .. i used to do this when such a situation comes

mahendran
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Old   October 11, 2006, 22:42
Default Re: turbulent viscosity problem
  #8
mahendran.n
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increase the limit values in the solve - controls - limits ... this will solve the problem .. i used to do this when such a situation comes

mahendran

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