Thank you Keyur,nI tried in both space claim and design modeler to ensure there was a single part for all three bodies and the topology was shared. When doing this, the 'mesh interfaces' create walls in between my fluid zones at that mesh contact region. I am unable to change this wall to an interface. Will this interfere with my calculations? nIf I delete the mesh contact in Meshing, it then creates the weird external walls I mentioned in the original post.nnThank you again for your assistance,nAlexn