[jzyk1212]

I am running a simulation where i am investigating the reduction mass flow rate in a Y shaped pipe with spheres placed inside the pipe. My aim is to measure the reduction in mass flow rate based on the number of spheres inside the pipe and comparing it to the same pipe model with no spheres inside.

I am using a stagnation inlet at my inlet and normal outlet at both of my outlets. I have set up a scene showing the pressure in which i have obtained the pressure drop from the inlet to outlet. I also have a mass flow rate report set up at my inlet and outlets but when comparing that to the mass flow report generated from the no spheres case, the inlet mass flow rate values are different. I do not understand this as everything is the same in both simulations with the only difference being spheres vs no spheres.

See pictures down below.Left picture is the no spheres case and the right picture is with spheres case.

Is there a better way to measure the reduction in mass flow rate that will show it clearly compared to the case with no spheres inside the pipe?

Any advice will appreciated.