I am applying a velocity boundary condition at an inlet from an inlet velocity profile exported from an outlet. I notice that there can be
a difference of 1-2% in the mass flow for the simulation performed with the velocity profile at the inlet. I would like to
enforce continuity of mass flow. How can I do this? - KSVIHLA
To start, you should export the velocities at the outlet as a profile in CFX-Post. Make sure when you do this that you set the
variable type to be conservative. This will give the conservative velocities at all the nodes on the outlet. Velocity inlet values are applied
at the face centers of the inlet, not the nodes. If you set the xpert parameter 'use bip velocity = f`, then the nodal values will be used
which should bring the mass flow closer to the value at the outlet from which the profile data were exported.