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

Did you try and plot the inlet volume fraction profile (XY plot) after initializing the case and running 1-3 iterations?

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

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

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?

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

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

yeah sure.

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