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May 6, 2004, 08:52 |
turbulent viscosity
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#1 |
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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 |
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May 6, 2004, 16:44 |
Re: turbulent viscosity
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#2 |
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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 |
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May 7, 2004, 02:10 |
Re: turbulent viscosity
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#3 |
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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! |
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May 8, 2004, 00:11 |
Re: turbulent viscosity
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#4 |
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I am also getting same messege. May you tell me the formula to calculate turbulent viscosity. Thanks
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May 10, 2004, 20:07 |
Re: turbulent viscosity
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#5 |
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The turbulent viscosity ratio is defined as following: turbulent viscosity --------------------- laminar viscosity
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May 11, 2004, 05:53 |
Re: turbulent viscosity
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#6 |
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how about makign the grid little refined!!!!
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May 11, 2004, 07:53 |
Re: turbulent viscosity
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#7 |
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is your problem still existing or did some changes make your simulation working again?
regards, zachi |
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