# turbulent viscosity

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 May 6, 2004, 08:52 turbulent viscosity #1 habib hossainy Guest   Posts: n/a hei, i am simulating a two-phase flow of air-water in a circular pipe and after som iterations it stops and the following is shwon, turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 9854 cells... Error: Too many (0) VOF sub-timesteps. The velocity field is probably diverging. Please check the solution, and reduce the time-step if necessary. I have reduced the time steps without any result, can anybody tell me what is wrong? Thanks

 May 6, 2004, 16:44 Re: turbulent viscosity #2 Pardeep Guest   Posts: n/a what is the turbulence model ur using? What is the initial values of K and Epsilon(in case ur using K-E)? That comment about TV limited ... means that ur Turbulence model is not working properly. Try initial values of K and Epsilon of the order of 10E-3 or 10E-4 I think that shud help ur case. Let me know if u try this? Pardeep

 May 7, 2004, 02:10 Re: turbulent viscosity #3 Pravin Naphade Guest   Posts: n/a U r getting message that turbulent viscosity is limited to 1.00e10+05. that mean calculated ratio is more than this..since it is limited to above value u r facing the problem... In fluent goto SOLVE....CONTROLS.....LIMITS .. in limits increase the maximum turbulent viscosity ratio to 1.0e10+07 and try best luck next time!

 May 8, 2004, 00:11 Re: turbulent viscosity #4 Mukkarum Guest   Posts: n/a I am also getting same messege. May you tell me the formula to calculate turbulent viscosity. Thanks

 May 10, 2004, 20:07 Re: turbulent viscosity #5 co2 Guest   Posts: n/a The turbulent viscosity ratio is defined as following: turbulent viscosity --------------------- laminar viscosity

 May 11, 2004, 05:53 Re: turbulent viscosity #6 zxaar Guest   Posts: n/a how about makign the grid little refined!!!!

 May 11, 2004, 07:53 Re: turbulent viscosity #7 zachi Guest   Posts: n/a is your problem still existing or did some changes make your simulation working again? regards, zachi

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