I am interested in comparing several different fan blades using flow simulation. The fan blade is located inside of a tube, so I would like to do an internal flow simulation.
What metric do I use to compare the different fan blades? I think that MASS FLOW RATE is the best metric because I want to see how much air is moved by the rotating fan blade. Yet MASS FLOW RATE is not one of the results. It is a goal that I set up to use for convergence.
The MASS FLOW RATE is positive and negative when I look at the graph. So how do I make sense of this? What is the total mass flow rate or even volumetric flow rate?