Pressure inlet and pressure outlet

MFiX How to
#1

I want to simulate the 2d process of plugging cracks by particles, and I have some problems.

  1. This should be a pressure driven flow, and I need to get the gradual decrease in fluid velocity. In mass inflow boundary, a velocity has to be set. Is it a initial velocity or a constant velocity?
  2. In addition, I cannot set a particle volume fraction on mass inflow boundary in 2d case (only one cell in z direction). Whenever I do that, I got an error: No un-cut fluid cells adjacent to DEM_MI staging area. Unable to setup the discrete solids mass inlet for BC: 1. But this error doesn’t appear when particle volume fraction is 0 on mass inflow boundary.
#2
  1. The MI velocity is constant in time. If you want to make it vary, you will need to use a UDF. Please take a look at the tfm pulsating fluidized bed (GUI main menu> New simulation) for an example.
  2. Most likely your opening is too small or your STL normals are pointing in the wrong direction.