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-   -   using profile to specify inlet VOF and velocity (https://www.cfd-online.com/Forums/fluent/36755-using-profile-specify-inlet-vof-velocity.html)

yf May 24, 2005 10:16

using profile to specify inlet VOF and velocity
 
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

pUl| May 24, 2005 11:55

Re: using profile to specify inlet VOF and velocit
 
Did you try and plot the inlet volume fraction profile (XY plot) after initializing the case and running 1-3 iterations?

yf May 24, 2005 12:01

Re: using profile to specify inlet VOF and velocit
 
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

yf May 24, 2005 12:05

Re: using profile to specify inlet VOF and velocit
 
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

pUl| May 24, 2005 12:39

Re: using profile to specify inlet VOF and velocit
 
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?

yf May 24, 2005 12:45

Re: using profile to specify inlet VOF and velocit
 
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

pUl| May 24, 2005 12:51

Re: using profile to specify inlet VOF and velocit
 
Yes, Let me know it it works for you. Thanks.

yf May 24, 2005 12:52

Re: using profile to specify inlet VOF and velocit
 
yeah sure.

yf June 2, 2005 05:40

Re: using profile to specify inlet VOF and velocit
 
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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