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

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?

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

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

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?

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

Re: using profile to specify inlet VOF and velocit
 

Yes, Let me know it it works for you. Thanks.

Re: using profile to specify inlet VOF and velocit
 

yeah sure.

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