Preview Mesh Motion- negative cell volume

- April 24, 2019 at 8:25 pm
  
  lianapolikaitis
  Subscriber
  
  Hi all,
  
  I am modeling a centrifugal pump using both an SST and k-epsilon model. The pump has an MRF (rotating fluid region) around the impeller and the impeller wall is moving relative to the MRF. When I preview mesh motion I am getting negative cell volume. I have tried decreasing the time step size to .0001 and nothing seems to work. I have also used body sizing in mesh to create the same sized cells in the MRF zone and adjacent deforming mesh. Any suggestions? Below is the deforming mesh from my model and the mesh generated of the entire pump.