Floating Point Exception Object Error #f
 

Hi all - brand new Fluent user here using Fluent for my senior design project. I am trying to model 3-D supersonic flow through a duct. The model will solve just fine at subsonic and incompressible speeds. However, as soon as I turn on compressible considerations, I get the floating point exception, typically within the first few iterations. I have tried just about everything I can think of to fix this (Reducing URF's, reducing mesh size on critical features to the point of freezing a school computer) and I am at a loss. Any help would be much appreciated!