Since you are solving an incompressible flow problem, your extraction flow rate will match your inlet flow rate automatically. Using a velocity inlet and outlet condition for your boundaries is not a robust way of setting up the problem. You should be using either of the three combinations (in the following order):
1. Velocity inlet (or mass flow inlet) and pressure outlet
2. Pressure inlet and pressure outlet
3. Pressure inlet and velocity outlet or mass flow outlet (I would not use this unless you are unable to absolutely pin down your boundary conditions and use options 1 and 2).
I hope this helps.
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