About density treatmen for velocity inlet BC.
 

Hi,If now have an Air flow problem,we give velocity inlet BC,but we want to know about how CFX to calculate the density?

You do not specify density directly. The density is defined by the inlet temperature.

thanks, calculate density need temperature and pressure,how the pressure is defined?

This is all described in the documentation. Pressure is taken from the boundary control volume, ie from the domain.