AMG Divergence with Energy Eq

Paul

Okay for some reason today, I'm encountering the AMG divergance/floating point exception errors when attempting to run a few simulations on venturi tubes.

I'm able to run a venturi tube model with the energy equation enabled without a problem. I went into gambit and designed a similar model but with different dimensions. I meshed it the same way, set everything up in fluent the same way, except now if the energy equation is enabled it crashes. This happened with three different models that I made today, but the models that I made yesterday run without a problem. Aside from the new models being larger than the old ones (12" diameter instead of 8") there is really no difference. Anyone have any ideas why this would be happening?

Thanks.