[omid88]

I'm doing a simple VOF simulation for water and air.
I usually set the parameters and solvers like in the VOF-tutorial of the Fluent.
After running the simulation,the water is expected to be spread on the wall but it would act in an strange way as can be seen in the below picture(the gravity's direction is correct).
(I did a same simulation in another software(StarCCM+) and it also gave me this result!!!)

I would appreciate any idea.
Thanks in advance.

[omid88]

Nobody has any idea?
And one thing else:By eliminitating the surface tension between water and air,it behaves good and spreades on the wall!!!

[vig]

Have you enabled wall adhesion for this case ?

[omid88]

Originally Posted by vig

Have you enabled wall adhesion for this case ?

Yes i had enabled the wall adhesion with different contact angles.
But the problem was in another point:
by changing the primary phase to secondary phase(and consequently changing the initial condition) the problem was solved!
And i still don't know the difference between having water in secondary phase or primary phase!(when initialization is correct)

[vig]

Did you change the contact angle accordingly when changing the order of phases. I suspect this behavior could be due to contact angle being hydrophobic (contraction) or hydrophylic (expansion).

[omid88]

Originally Posted by vig

Did you change the contact angle accordingly when changing the order of phases. I suspect this behavior could be due to contact angle being hydrophobic (contraction) or hydrophylic (expansion).

Yes i changed them,But the problem was solved only when i replaced the primary phase to secondary phase.When initialization is correct,there shouldn't be any difference either using water in primary phase or secondary phase.I really like to know the reason behind of this problem.

[daniel_anton785]

Did you solve your problem, because I have the same with only watter and air, it show all the volume fraction equal to zero

[omid88]

Originally Posted by daniel_anton785

Did you solve your problem, because I have the same with only watter and air, it show all the volume fraction equal to zero

My problem was not in a way you mentioned.
You have problem to initialize it.You should go to initialize part,click on "patch" and then try to initiliaze your water or air to your particular zone.
and then start the simulation...