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-   -   turbulent viscosity limited to viscosity ratio (http://www.cfd-online.com/Forums/fluent/33619-turbulent-viscosity-limited-viscosity-ratio.html)

mukkarum April 30, 2004 03:26

turbulent viscosity limited to viscosity ratio
 
Hi

My solution is going to converge but after each iteration I am getting messege that " turbulent viscosity limited to viscosity ratio 1.000000e+05 on x cells". I am using realizable k-epselon model with standard wall function.

Anyone please help me to get rid this problem.

Thanks

Mukkarum

ap April 30, 2004 05:26

Re: turbulent viscosity limited to viscosity ratio
 
This problem usually happens if you have a too coarse grid somewhere in your domain. Plot a contour of the viscosity ration and try to refine the grid there.

Look for other messages on this subject too, there are a lot of questions and answers in this forum.

Hi :)

ap

Pravin Naphade May 7, 2004 03:33

Re: turbulent viscosity limited to viscosity ratio
 
In fluent u just goto

SOLVE.....CONTROLS.....LIMITS .. in limits increase the value of Max. turbulent viscosity ratio to 1.0e10+07... ..it is just the limit...it will not affect ur final solution.....afterward u will not get the mentioned message and u will get faster convergence..CERTAINLY ..try once best luck!

ap May 11, 2004 05:05

Re: turbulent viscosity limited to viscosity ratio
 
I don't agree. The limit on turbulent viscosity ratio has been introduced to obtain a stable numerical solution, but it's not necessarily correct.

FLUENT sets the limit using a value which is acceptable in many cases, but if the limitation takes place it could affect the solution.

Hi :)

ap


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