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-   -   turbulent viscosity problem (http://www.cfd-online.com/Forums/fluent/42473-turbulent-viscosity-problem.html)

majie023 October 6, 2006 07:22

turbulent viscosity problem
 
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?

Neelima October 6, 2006 15:40

Re: turbulent viscosity problem
 
Hello,

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

Neelima

majie023 October 6, 2006 20:12

Re: turbulent viscosity problem
 
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.

zxaar October 6, 2006 20:27

Re: turbulent viscosity problem
 
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.

sam October 7, 2006 05:07

Re: turbulent viscosity problem
 
as i guess this is problem due to ill posed boundary condition. are u sure abt ur BC?


sach October 9, 2006 03:35

Re: turbulent viscosity problem
 
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

mahendran.n October 11, 2006 21:40

Re: turbulent viscosity problem
 
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

mahendran.n October 11, 2006 21:42

Re: turbulent viscosity problem
 
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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