Help with Modelling Incompressible Air flow through a verticle funnel
 

I'm trying to model air flow through a vertical diverging asymmetrical nozzle in Fluent 6 and am having the most difficulty trying to do so. For some reason when I rotate my model 90 degrees to make a horizontal diverging asymmetrical nozzle the solution converges but when the model is vertical I receive a floating point error. Can anyone help me to understand what the problem is?