[vavnoon]

Dear friends,

I understood that in the version 2020 R1 of fluent, a moving wall dose not have slipping condition option inspite of the older versions, for example 17 and 18.
I have a two-phase case but because of negligible changes in free surface, I decided to calculate it as a single phase and I chose slipping condition with zero shear stress for the top boundary (free surface). In addition, I applied mesh motion (sliding mesh) in my case (also frame motion for comparision these two methods).
As fae as I know, in mesh motion we select moving relative to cell zone for moving boundaries and moving with zero velocity in absolute frame for stationary walls; and in this method we do not select stationary condition at all (of course in former versions of fluent).

Now the only option for applying slipping condition is stationary wall.
In addition to the free surface, there is this ambiguity for interfaces between two zones in mesh motion.

I would be so grateful if you could share your comments and experiences with me in this regards.
Thank you.