How can I model constant pressure fluid flow in ABAQUS for pore-pressure cohesive elements?

[navidz]

I am modeling fluid driven crack propagation in ABAQUS by using cohesive elements. I can model fluid flow by using *CFLOW in my input file, but how can I use constant pressure fluid flow rather than constant flow rate. On the other words, I want to use constant pressure pump instead of constant flow pump. I just want to keep the pressure at the opening of the crack to be constant .

 

[navidz]

I would be grateful if anyone can help