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Old   May 4, 2005, 04:41
Default water rising behind the domain
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sulfi
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hi all,

i am using VOF to model the flow past a body in 3D. after some time steps i found the water behind the domain rising and i am not able to get the stable solution even after 2.5 seconds(4days running time)

i found the same problem while simulating the 2D problem also.

what is the reason

how much we can rely on fluents VOF code

thanks all
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Old   May 4, 2005, 05:06
Default Re: water rising behind the domain
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edi ghirardi
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Rising? What about the gravity components? Stable? if you mean a still free surface and you have only viscous damping you have to wait minutes...(weeks running time), but it depends obviously on the problem.

Fluent VOF model seems to be reliable such as most of others CFD codes, but maybe there's something better around (Flow 3d?). I'm asking the same question...

Good luck.

Edi.
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Old   May 4, 2005, 06:33
Default Re: water rising behind the domain
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sulfi
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rising that is water volume is increasing. i am giving an inflow and outflow BC for air and water. but free surface behind the body is coming up.
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Old   May 4, 2005, 12:16
Default Re: water rising behind the domain
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edi ghirardi
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Uhmm...maybe you should use a pressure condition at the outlet. Often outflow conditions lead up to have problems. Or you can place the outflow condition (if needed) as far from the main flow region as possible.

Hope this helps.

Edi.
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