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Air and Water VOF model, Error??

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Old   July 18, 2002, 01:53
Default Air and Water VOF model, Error??
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boris
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I am simulating an empty tank filled with water (water inlet is at bottom of the tank, air outlet at top) using a VOF model. Although I turned on the gravity and body force options, the results show that the air and water are mixed together rather having a clear interface with water at the bottom and air at the top. Who can tell me what's the problem? Thank you in advance.
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Old   July 18, 2002, 05:04
Default Re: Air and Water VOF model, Error??
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david
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What type of VOF you are using ? Fluent offers 4 type, right ?? DC
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Old   July 18, 2002, 21:14
Default Re: Air and Water VOF model, Error??
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Boris
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Thank you. There are three types of discretization schemes for Volume of Fluid (VOF) offered by Fluent. I tried Implicit and Geo-Restruct. The problem persists. Looking forward for your advise.
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Old   July 18, 2002, 22:45
Default Re: Air and Water VOF model, Error??
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david
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Use Geo-Restruct and also use VOF under relaxation 0.5. Try to use gradient of VOF after few time steps. You should be fine.

DC
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Old   July 18, 2002, 23:00
Default Re: Air and Water VOF model, Error??
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Boris
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Thank you for your quick reply. For Fluent 6.0, there is no under relaxation factor with Geo-Restruct. What do you mean by "gradient of VOF". Looking forward for your reply.
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Old   July 19, 2002, 03:08
Default Re: Air and Water VOF model, Error??
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david
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Try to adapt the grid based on the gradient of volume fraction of one phase.
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