turbulent viscosity ratio

subhas.hunasikatti@gmail. · December 16, 2013, 05:08

Hi friends, I am very new, I am solving the CPU cooling system by using different openings. In this case i have prepaired a 3D model and i have ran in FLUENT, at the time of solving in fluent i got an message like Turbulent viscosity limited to viscosity ratio of 1*10^5. Can any one tell me how to remove or solve the above mentioned message...?

thank you in advance

with regards
subhas

Persil · December 16, 2013, 06:05

in the boundary conditions you can raise up the viscosity ratio of your in-/outlet for example

Albino · December 16, 2013, 06:15

I got this error after 45s of flow time (with 0.001 timestep) in my simulation today as well. At the same time, my Cl got to like -inf. Before this happened everything looked quite fine.

I assume something else caused the error (bad meshing on my 2D model?). Or is it normal to hit the limit of this ratio?

Im simply modelling (2D) flow over 2 cylinders (where one can move).

December 16, 2013, 05:08	turbulent viscosity ratio	#1
subhas.hunasikatti@gmail. Member subhas hunasikatti Join Date: Sep 2013 Posts: 32 Rep Power: 12	Hi friends, I am very new, I am solving the CPU cooling system by using different openings. In this case i have prepaired a 3D model and i have ran in FLUENT, at the time of solving in fluent i got an message like Turbulent viscosity limited to viscosity ratio of 1*10^5. Can any one tell me how to remove or solve the above mentioned message...? thank you in advance with regards subhas

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December 16, 2013, 06:05		#2
Persil Member Join Date: Nov 2013 Posts: 43 Rep Power: 12	in the boundary conditions you can raise up the viscosity ratio of your in-/outlet for example

December 16, 2013, 06:15		#3
Albino New Member Join Date: Oct 2013 Posts: 7 Rep Power: 12	I got this error after 45s of flow time (with 0.001 timestep) in my simulation today as well. At the same time, my Cl got to like -inf. Before this happened everything looked quite fine. I assume something else caused the error (bad meshing on my 2D model?). Or is it normal to hit the limit of this ratio? Im simply modelling (2D) flow over 2 cylinders (where one can move).