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reversed flow &turbulent viscosity

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Old   August 6, 2007, 07:18
Default reversed flow &turbulent viscosity
  #1
superfool
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hi,everyone, I have a question that my case was converged ,but there are some additional message such as follows,could you tell me why and how to deal with them?

reversed flow in 5612 faces on pressure-outlet 10. turbulent viscosity limited to viscosity ratio of 1.000000e+005 in 27284 cells ! 832 solution is converged

832 7.2256e-05 6.1473e-04 3.1136e-04 3.0135e-04 9.9980e-04 7.7691e-04 28:49:33 9687
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Old   August 6, 2007, 07:37
Default Re: reversed flow &turbulent viscosity
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farhan
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check for boundary conditions and also for grid quality
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Old   August 6, 2007, 07:41
Default Re: reversed flow &turbulent viscosity
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superfool
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my boundary conditions are pressure-inlet and pressure-outlet, i think my grid is ok,because my grid is multi-block structural grid
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Old   August 6, 2007, 07:53
Default Re: reversed flow &turbulent viscosity
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ritmat
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try to change outflow for your outlet (OR velcoity inlet for your inlet)
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Old   August 6, 2007, 07:59
Default Re: reversed flow &turbulent viscosity
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superfool
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when i use the Mass-flow-inlet Boundary, but do not get rid of that promblem
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Old   August 6, 2007, 10:00
Default Re: reversed flow &turbulent viscosity
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ritmat
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mass flow inlet is mainly for compressible flow. Try like i said to remove the pressure outlet and change into outflow
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Old   August 6, 2007, 19:51
Default Re: reversed flow &turbulent viscosity
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superfool
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pressure-outlet may be more suitable for my case,but i will try as your advice,thanks
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Old   August 7, 2007, 02:00
Default Re: reversed flow &turbulent viscosity
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Virag Mishra
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Hi all I was am also facing the same problem, i tried changing the pressure outlet boundary condition to outflow but no successes. But got rid of it when i decreased the no of nodes in the mesh , but im unable to justify how it happened. any explanation.
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