changing the coefficients of pressure correction
Hi all, I need to do some change in IPSA PHOENICS to adjust with my twophases problem. The source of momentum equation associated with pressure for U_i in PHOENICS is given by r_i*dP, where r_i is the volume fraction of phasei and dP is the gradient of total pressure.
In my model, the relation between the first and the second phase pressure is expressed by : P1 + P2 = Pc where Pc will be given (a kind of capillary pressure). Therefore, P1 and P2 are not associated with its volume fractions. I denote dP1, dP2 and dPc as the gradient of P1, P2, and Pc respectively. My plan is to use dP1 as the source of momentum for U_1, while for U_2 the source of momentum will be dPc  dP1 where dPc is given previously. In this way, the pressure correction will work on first phase pressure P1 instead of total pressure P. To implement this, I will disactivate the term 'builtin source' (in order to cancel the gradient), then I will add dP1 (as source of U_1) and dPcdP1 (as source of U_2) via GROUND. I think the problem now is in pressure correction equation whose coefficients, in PHOENICS, has been builtin to accommodate the correction of total pressure in term of r_i*(dP). Is there a possibility to change this coefficients via GROUND ? If yes, where (which Group) and how (the locations in Farray they are stored) ? If there is another way which is easier to implement this, I will be pleased and grateful to know that. Best Regards, Noel 

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