I successfully coupled my case scenario (it runs without an error message). I believe I am missing something. Once post processing starts, I upload the DEM vtk file and the CFD vtk file. From paraview, I see that particle-fluid interaction occurs ONLY based on the initial DEM particle positions, BUT it seems as if the particles are fixed in place.
Does anyone have any suggestion or hints? What do you think I am missing? I uploaded my initial and run script. Thank you. It was based off of the ErguntestMPI.