Correct location for inflow and outflow boundaries

Varun

Hi

Im modeling a 2D pipe with a double backward step using air as the fluid. Needed to know whether there is any way to determine whether my inflow and outflow boundaries have been placed in the correct location. There is one inflow and one outflow. How can i determine this? And how could i correct it in Ansys 11.0 CFX-Pre?

Thanks a tonne.

Varun