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-   -   Air and Water VOF model, Error?? (http://www.cfd-online.com/Forums/fluent/30045-air-water-vof-model-error.html)

boris July 18, 2002 01:53

Air and Water VOF model, Error??
 
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.

david July 18, 2002 05:04

Re: Air and Water VOF model, Error??
 
What type of VOF you are using ? Fluent offers 4 type, right ?? DC

Boris July 18, 2002 21:14

Re: Air and Water VOF model, Error??
 
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.

david July 18, 2002 22:45

Re: Air and Water VOF model, Error??
 
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

Boris July 18, 2002 23:00

Re: Air and Water VOF model, Error??
 
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.

david July 19, 2002 03:08

Re: Air and Water VOF model, Error??
 
Try to adapt the grid based on the gradient of volume fraction of one phase.


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