Potential wrong behavior of particles in MPPICInterFoam when using MRF
I'm opening this ticket as a follow up to #1941 (closed) after running the same test with MPPICInterFoam as requested by @Sergio.
As you can see from the two video attached, the standard MPPICInterFoam solver behaves essentially in the same way as my custom solver, i.e. water phase is convected by relative velocity in the MRF region of the standard mixerVessel tutorial used here whereas the particles are not.
If one switches to drag force given by relative velocity in the MRF region as I did in my modified custom solver, then the particles behaves correctly when looking at the reference AMI based simulation, where the MRF region is replaced by the actually moving mesh.
Looking forward to hearing your thoughts.