cylinder pipe
 

I made a cylinder in gambit,I put the circle face of this cylinder as inflow and the other circle outflow.but when
I put it in fluent and start it,it gives me floating point error.without any iteration.what is the problem?who knows?Is the problem from my set up in fluent or my model in gambit?just by making cylinder,will fluent know it as pipe?

if the fluent check mesh doesn't return any problem, then your issue lies on the setup