# where is the superman ---about the IPSA-full

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 March 27, 2009, 22:34 where is the superman ---about the IPSA-full #1 New Member   paul zhang Join Date: Mar 2009 Posts: 8 Rep Power: 10 Sponsored Links dear all: i want to simulate the two-flow fluid with IPSA-full model .but (1)how can i get the value of P2,and how can i modify the P2 value .for example make p2=p2+constant (2)in the IPSA-full model ,how does it trace the interface of two-flow.could you tell me where the associated subroutine is

 April 9, 2009, 21:14 #2 New Member   paul zhang Join Date: Mar 2009 Posts: 8 Rep Power: 10 no one?？？/？/???/

 April 27, 2009, 07:57 P2 in IPSA #3 New Member   michael malin Join Date: Mar 2009 Location: london Posts: 25 Rep Power: 11 If you enter STORE(P2) in the Q1 input file , then PHOENICS will compute the pressure acting on the 2nd-phase momentum momentum to be P1 + P2, where P1 is the pressure acting on phase 1. Therefore, P2 is the EXTRA pressure experienced by phase 2. It is the responsibility of the user to specify the formula for P2 in Group 19 Section of GROUND, or alternatively by use of the INFORM facility within the Q1 input file. A GROUND-coding example of setting a P2-formula is given in Group 19 Section 4 of the file GREX3.FOR, as follows: C IF(STORE(P2)) THEN IF(STORE(VPOR)) THEN C.... Extra second-phase pressure proportional to volume fraction C divided by porosity. CALL FN15(P2,R2,VPOR,0.0,PHS2PA) ELSE IF(PHS2P) THEN C.... Extra second-phase pressure proportional to: C a*(r2-r2crit)**b if r2 gt r2crit. L0R2=L0F(R2) L0P2=L0F(P2) RLX=ABS(DTFALS(P2)) DO 1941 I=1,NXNY IF(F(L0R2+I).GT.PHS2PA) THEN GP2=PHS2PB*(F(L0R2+I)-PHS2PA)**PHS2PC ELSE GP2=0.0 ENDIF F(L0P2+I)=RLX*GP2+(1.0-RLX)*F(L0P2+I) 1941 CONTINUE ELSE C.... Extra second-phase pressure proportional to volume fraction CALL FN2(P2,R2,0.0,PHS2PA) ENDIF ENDIF ENDIF ENDIF

 April 28, 2009, 03:04 #4 New Member   paul zhang Join Date: Mar 2009 Posts: 8 Rep Power: 10 Thanks for phoenics_cfd's immediately reply now if i want to specify my EXTRA pressure experienced by phase 2,is it correct to specify the formula for P2 in Group 19 Section 4? is it neceesary for me to change the pressure correction methods? and how could i change the P2 by use of the INFORM ? THANK YOU AGAIN

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