Mass flow rate out
 

I have a model with 1 inlet dividing into 3 mass flow outlets. The problem is defined by the mass flow out not the inlet so I need to define mass flow on the outlets.

I set the inlet to 0m3/hr and the three mass outlets with their respective mass flow rates as positive numbers.

But nothing is happening. Any ideas as to how migh model this?

I have attached an image of the setup

correction not mass flow I am given volumetric flow in m3/hr

so I tried a work around solution

I took the total mass flow leaving through the two pumps of 15,208 m3/hr.

Equated this to 4.22 cubic m/s

divided it by the inlet area to give a flow rate of 0.456m/s.

then used outflow boundary condition with the flow divided 72% & 28% to the two different pumps.

But when I compute the mass flow out I get -5.1660714kg/s

Material is water so density is almost 1 so should be nearer the 4.22 cubic input I would have thought?

Any ideas or suggestions?