Hi CFX users,

I want to specify pressure and mass flow rate at the same time on inlet of a pipe. Is it possible? For example, 15atm and 1.6e-004kg s^-1. Thanks in advance.

David

Are you simulating compressible or incompressible flow? In incompressible the absolute value of pressure is of no relevance as only pressure-gradients appear in the equations.

Thanks, Fabian. I am simulating two-phase flow, one phase is gas and the other is liquid.

Hi David,

It is not possible to define both pressure AND mass flow at an inlet (unless it is a supersonic inlet, it which case it is necessary), nor does it make sense to do so. You will need to specify a pressure boundary condition elsewhere in your simulation (either another inlet, an outlet, or an opening). The pressure field will then be determined based on momentum and continuity.

Regards, Robin

Hello Robin

Thank you very much for your answer. Now I understand it.

Many regards David