Unusual Crash

leon

I have having some problems with a a model I have set up. I am runing v3.3 and I have set up a time dependent model outline below.

A heat source (flux varing in time)in a room. The room has adequate venting, both for venting air and make up air.

When I move the heat source around the room, the model crashhes. It works in some locations and not others. The models that do work converge satifacorly - for hte problem at hand.

I have kept a consitent approach to meshing and relaxation parameters.

Does anyone have any ideas.

Any help would be greatly appreciated.

Leon