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Old   March 9, 2006, 07:35
Default cavitation in fluent
  #1
john
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Hi All,

My run with cavitation in fluent is not converging well. I played with URF, but not that useful. Reducung URF is only reducing the speed of the run.

Kindly guide. If there is any specific trick.
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Old   March 9, 2006, 08:21
Default Re: cavitation in fluent
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mAx
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Try this: Pressure-velocity coupling: SIMPLEC Discretization for pressure: Linear all other: 1st order URF: all at 0.1 Convergence will be slow

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Old   March 9, 2006, 08:53
Default Re: cavitation in fluent
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john
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I have started the run as per your suggestions. Few more information is that my problem is 2D axisymmetric, containing triangles and quad cells.

Thanks
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Old   March 9, 2006, 09:03
Default Re: cavitation in fluent
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mAx
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try anyway
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Old   March 10, 2006, 00:53
Default Re: cavitation in fluent
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john
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No way it is converging. Moreover it is giving me very absurd results. I have mass flow rate BC at inlet and there are two outlets with atm pressure. The flow passes through small gap of 0.1mm gap. It is incompressible flow, with fluid in liquid state.
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Old   March 10, 2006, 02:54
Default Re: cavitation in fluent
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mAx
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switch on velocity inlet instead of massflow inlet. Befor you enable the mixture model (cavitation), initialize your domain with a well converged steady solutions. Then enable cavitation, and run it.

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Old   March 10, 2006, 06:37
Default Re: cavitation in fluent
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lius
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i have do this job many times, we could talk about it on MSN。the cavitation model is difficulty to converge
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Old   March 10, 2006, 06:40
Default Re: cavitation in fluent
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lius
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my MSN:zeliumin110@yahoo.com.cn
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Old   March 10, 2006, 08:45
Default Re: cavitation in fluent
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john
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Thanks Max.

Thanks lius. Just curious, the id mentioned is MSN or yahoo?
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Old   March 10, 2006, 08:49
Default Re: cavitation in fluent
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john
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I have tried some things suggested by Max in latest post. Earlier I was running cavitation with steady state. Once I switched to unsteady state, I am getting some logical results. Still vapor phase residual fluctuates a lot. Once I get adequate mass balance (which also fluctuates a lot), I will stop the computation for post processing.
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Old   March 14, 2006, 08:33
Default Re: cavitation in fluent
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mateus
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Hi!

If you´re interested I made some good simulations of cloud cavitation on a hydrofoil with fluent. An short example was also published in Fluent news (fall 2004 i think). If you want the whole paper (european journal of mechanics) sen me an email.

by MATEUS
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Old   March 18, 2006, 10:28
Default Re: cavitation in fluent
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san
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Hi,

can i have this papers for study.

i am very interested on cavitation problem.

thanking you,

with regards san
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Old   March 20, 2006, 03:06
Default Re: cavitation in fluent
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mateus
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No problem just send me an e-mail...
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Old   March 29, 2006, 07:29
Default Re: cavitation in fluent
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san
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Thanks for interest shown.

can i have ur email-id.

mine is

rsan_2001@rediffmail.com
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Old   March 29, 2006, 07:35
Default Re: cavitation in fluent
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mateus
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Hi!

It's matevz.dular@email.si

by MATEUS
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