How to model a fan with specific mass flow rate/volume flow rate in OpenFOAM?
 

I have been working on fan boundary condition in ANSYS FLUENT. If I'm not wrong I remember providing pressure jump based on axial velocity and in addition tangential and radial velocity component.
I'm currently working on modelling the fan in server and analyses via OpenFOAM. I found this BC fanpressure to be equivalent to fan boundary conditon.
I need to input the fan curve data and provide BC fanPressure for pressure and pressureInletOutletVelocity for velocity. In this case, mass flow rate is calculated by pressure but I need to fix the volume flow rate/mass flow rate in the fans for server.
Can anyone provide me an idea how to do it?