[Elvin]

Dear forum members, I have a problem with MPPICInterFoam. As far as I understand there is an interFoam under its hood.

I have a horizontal pipe in which I initialize the fluid. Let's say it occupies half of the volume. The fluid has an initial level and velocity (internal velocity, we're not talking about BCs) set with setFields. After running interFoam, no waves appear in this pipe, i.e. the liquid just flows.

But when I run the same case in MPPICInterFoam (I do setFields here too), the fluid velocity that was set with setFields goes to zero on the first iterations and a wave appears.

Solver parameters are the same both there and there. How can I solve this problem? Thanks in advance.