How to create flow simulation for air aspiration ?

Hello i have a problem , i have an empty tank that include 3 Holes , 1 hole is for the pump and the two other are the entrys of aire ( see attached photo ) the pump have to aspirate the air on the tank , the pump have a depressure in bar and a rate of flow in l/min
I want to know the forces values created by this pump in the region of the two holes of air entry ( see the attached photo )
How to do this please thank you

PS : I dont have a cad file of the pump i just want to simulate it by putting the depressure and the flow as simulation entries