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using profile to specify inlet VOF and velocity

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Old   May 24, 2005, 10:16
Default using profile to specify inlet VOF and velocity
  #1
yf
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hi there... i am simulating two-phase flow in a tube, VOF model. i used "profile" to specify both VOF and inlet velocity. to my surprise, fluent just ignore the inlet VOF specified using "profile". any idea? thanks in advance. yf
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Old   May 24, 2005, 11:55
Default Re: using profile to specify inlet VOF and velocit
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pUl|
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Did you try and plot the inlet volume fraction profile (XY plot) after initializing the case and running 1-3 iterations?
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Old   May 24, 2005, 12:01
Default Re: using profile to specify inlet VOF and velocit
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yf
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dear pU1, thanks. i have plotted the VOF both after initializing and after a few iterations. its properly initialized. however, after a few iterations, the inlet VOF boundary conditions specified using "profile" does not seem to be enforced. the plots show different inlet VOF. any suggestion?

regards, yf
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Old   May 24, 2005, 12:05
Default Re: using profile to specify inlet VOF and velocit
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yf
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by the way, the program works fine if we use "profile" to specify inlet VOF only. the inlet velocity is set to be a constant (no with 'profile') yf
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Old   May 24, 2005, 12:39
Default Re: using profile to specify inlet VOF and velocit
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pUl|
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An inlet boundary condition is a "Boundary condition" and therefore should not change. I am aware of the problem you are referring to. Especially if your geometry has walls, I have noticed that when using a boundary profile file, the cell near the wall never gets initialized properly. I do not know whether this is some interpolation related issue or it is some error on my part. However, my experience with using DEFINE_PROFILE instead of a '.prof' file has been much better. Have you tried specifying your profile using a UDF?
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Old   May 24, 2005, 12:45
Default Re: using profile to specify inlet VOF and velocit
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yf
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dear PUl, i found that such situation occurs if we use "profile" to specify inlet VOF and inlet velocity. i tried using "profile" for inlet VOF and UDF for inlet velocity, however it does not help. i will try to specify both with UDF and see what happens. thanks for u suggestion yf
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Old   May 24, 2005, 12:51
Default Re: using profile to specify inlet VOF and velocit
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pUl|
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Yes, Let me know it it works for you. Thanks.
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Old   May 24, 2005, 12:52
Default Re: using profile to specify inlet VOF and velocit
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yf
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yeah sure.
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Old   June 2, 2005, 05:40
Default Re: using profile to specify inlet VOF and velocit
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yf
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hi pUl, i have tried using the UDF, its not working as i expected. need some time to figure it out. i will keep u updated. thank you yf
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