```
TALK=T;RUN(1,1)
PHOTON USE
p
phi
1 20 1

msg grid (scale enlarged 20 times in y direction)
gr z 1
msg Press  to continue
pause;  cl
msg 1st-phase (vapour) velocity vectors
vec z 1 sh;  gr ou z 1
msg Press  to continue
pause ;  cl
msg 2nd-phase (water) velocity vectors
set vec comp;  au2 bv2 -;  vec z 1 sh;  gr ou z 1
msg Press  to continue
pause;  cl
msg contours of pressure
con p1 z 1 fi;0.1;  gr ou z 1
msg Press  to continue
pause;  cl
msg contours of 1st-phase (vapour) volume fraction
con gas z 1 fi;0.1;  gr ou z 1
msg Press  to continue
pause ;  cl
msg contours of 2nd-phase (water) enthalpy
con iliq z 1 fi;0.1;  gr ou z 1
msg Press e to END
enduse
DISPLAY
NUMERICAL BENCHMARK PROBLEM 3.2: BOILING IN A CHANNEL
Saturated water enters a duct of uniform rectangular
cross-section. The first quarter of its length is
unheated; but heat is supplied to the remainder of the
pipe at a fixed rate, causing boiling, and a consequent
acceleration of both liquid and vapour.

Three cases are considered. In the first, the influence
of gravity is totally neglected. In the second, the duct
is vertical, with flow from bottom to top, and the effect
of gravity is accounted for. In the third, the pipe is
horizontal, and the effect of gravity is again taken into
account.

The task is to predict the distributions of steam and water
velocities and enthalpies, of pressure, and of volume
fraction, along the pipe. Special interest attaches to
comparisons between the three cases.
ENDDIS
************************************************************
Group 1. Run Title and Number
************************************************************
************************************************************

TEXT(BOILING , LONGITUDINAL GRAVITY :    W898)

************************************************************
************************************************************

IRUNN = 1 ;LIBREF = 897
************************************************************
Group 2. Time dependence
************************************************************
Group 3. X-Direction Grid Spacing
CARTES = T
NX = 20
XULAST =1.
XFRAC(1)=0.05 ;XFRAC(5)=0.25
XFRAC(9)=0.45 ;XFRAC(13)=0.65
XFRAC(17)=0.85
************************************************************
Group 4. Y-Direction Grid Spacing
NY = 10
YVLAST =1.0E-02
YFRAC(1)=0.1 ;YFRAC(3)=0.3
YFRAC(5)=0.5 ;YFRAC(7)=0.7
YFRAC(9)=0.9
************************************************************
Group 5. Z-Direction Grid Spacing
PARAB = F
NZ = 1
ZWLAST =1.0E-02
ZFRAC(1)=1.
************************************************************
Group 6. Body-Fitted Coordinates
************************************************************
Group 7. Variables: STOREd,SOLVEd,NAMEd
ONEPHS = F
EQUVEL = F
NAME(1)=P1 ;NAME(3)=U1
NAME(4)=AU2 ;NAME(5)=V1
NAME(6)=BV2 ;NAME(9)=GAS
NAME(10)=LIQ ;NAME(14)=H1
NAME(15)=ILIQ ;NAME(150)=MDOT
* Y in SOLUTN argument list denotes:
* 1-stored 2-solved 3-whole-field
* 4-point-by-point 5-explicit 6-harmonic averaging
SOLUTN(P1,Y,Y,N,N,N,Y)
SOLUTN(U1,Y,Y,N,N,N,Y)
SOLUTN(AU2,Y,Y,N,N,N,Y)
SOLUTN(V1,Y,Y,N,N,N,Y)
SOLUTN(BV2,Y,Y,N,N,N,Y)
SOLUTN(GAS,Y,Y,N,N,N,Y)
SOLUTN(LIQ,Y,Y,N,N,N,Y)
SOLUTN(H1,Y,Y,N,N,N,Y)
SOLUTN(ILIQ,Y,Y,N,N,N,Y)
SOLUTN(MDOT,Y,N,N,N,N,Y)
INTMDT = 150
************************************************************
Group 8. Terms & Devices
* Y in TERMS argument list denotes:
* 1-built-in source 2-convection 3-diffusion 4-transient
* 5-first phase variable 6-interphase transport
TERMS(P1,Y,Y,Y,N,Y,Y)
TERMS(U1,Y,Y,Y,Y,Y,Y)
TERMS(AU2,Y,Y,Y,Y,N,Y)
TERMS(V1,Y,Y,Y,Y,Y,Y)
TERMS(BV2,Y,Y,Y,Y,N,Y)
TERMS(GAS,Y,Y,Y,Y,Y,Y)
TERMS(LIQ,Y,Y,Y,Y,N,Y)
TERMS(H1,N,Y,Y,Y,Y,Y)
TERMS(ILIQ,N,Y,Y,Y,N,Y)
DIFCUT =0.5 ;ZDIFAC =1.
GALA = F ;ADDDIF = F
EQDVDP = F
ISOLX = -1 ;ISOLY = -1 ;ISOLZ = -1
************************************************************
Group 9. Properties used if PRPS is not
stored, and where PRPS = -1.0 if it is!
RHO1 =1. ;TMP1 =0.
EL1 =0.
TSURR =0. ;TEMP0 =0.
PRESS0 =0.
DVO1DT =0. ;DRH1DP =0.
EMISS =0. ;SCATT =0.
RHO2 =1000. ;TMP2 =0.
EL2 =0.
DVO2DT =0. ;DRH2DP =0.
ENUL =1.0E-03 ;ENUT =0.
PHINT(U1)=-2.022E+04 ;PHINT(AU2)=-2.022E+04
PHINT(V1)=-2.022E+04 ;PHINT(BV2)=-2.022E+04
PHINT(GAS)=-2.022E+04 ;PHINT(LIQ)=-2.022E+04
PHINT(H1)=2.5E+06 ;PHINT(ILIQ)=4.0E+05
PRNDTL(U1)=1. ;PRNDTL(AU2)=1.
PRNDTL(V1)=1. ;PRNDTL(BV2)=1.
PRNDTL(GAS)=1. ;PRNDTL(LIQ)=1.
PRNDTL(H1)=1. ;PRNDTL(ILIQ)=1.
PRT(U1)=1. ;PRT(AU2)=1.
PRT(V1)=1. ;PRT(BV2)=1.
PRT(GAS)=1. ;PRT(LIQ)=1.
PRT(H1)=1. ;PRT(ILIQ)=1.
CP1 =1. ;CP2 =1.
************************************************************
Group 10.Inter-Phase Transfer Processes
CFIPS =-50.
RLOLIM =0. ;CMDOT = HEATBL
CINT(P1)=1. ;CINT(U1)=1.
CINT(AU2)=1. ;CINT(V1)=1.
CINT(BV2)=1. ;CINT(GAS)=1.
CINT(LIQ)=1. ;CINT(H1)=1.0E-02
CINT(ILIQ)=1.
PHINT(P1)=-2.022E+04 ;PHINT(U1)=-2.022E+04
PHINT(AU2)=-2.022E+04 ;PHINT(V1)=-2.022E+04
PHINT(BV2)=-2.022E+04 ;PHINT(GAS)=-2.022E+04
PHINT(LIQ)=-2.022E+04 ;PHINT(H1)=2.5E+06
PHINT(ILIQ)=4.0E+05
************************************************************
Group 11.Initial field variables (PHIs)
FIINIT(P1)=1.0E-10 ;FIINIT(U1)=1.0E-02
FIINIT(AU2)=1.0E-02 ;FIINIT(V1)=1.0E-10
FIINIT(BV2)=1.0E-10 ;FIINIT(GAS)=1.0E-02
FIINIT(LIQ)=0.99 ;FIINIT(H1)=2.5E+06
FIINIT(ILIQ)=4.0E+05 ;FIINIT(MDOT)=0.
No PATCHes yet used for this Group
FSWEEP = 1
NAMFI =CHAM
************************************************************
Group 12. Patchwise adjustment of terms
Patches for this group are printed with those
for Group 13.
Their names begin either with GP12 or &
************************************************************
Group 13. Boundary & Special Sources

PATCH(INLET ,WEST , 1, 1, 1, 10, 1, 1, 1, 1)
COVAL(INLET ,U1 ,0. ,0. )
COVAL(INLET ,AU2 ,0. ,1.0E-02 )
COVAL(INLET ,V1 ,0. ,0. )
COVAL(INLET ,BV2 ,0. ,0. )
COVAL(INLET ,GAS , FIXFLU ,0. )
COVAL(INLET ,LIQ , FIXFLU ,10. )
COVAL(INLET ,H1 ,0. ,0. )
COVAL(INLET ,ILIQ,0. ,4.0E+05 )

PATCH(OUTLET ,CELL , 20, 20, 1, 10, 1, 1, 1, 1)
COVAL(OUTLET ,U1 ,0. ,0. )
COVAL(OUTLET ,AU2 ,0. ,0. )
COVAL(OUTLET ,V1 ,0. ,0. )
COVAL(OUTLET ,BV2 ,0. ,0. )
COVAL(OUTLET ,GAS ,1. ,0. )
COVAL(OUTLET ,LIQ ,1000. ,0. )
COVAL(OUTLET ,H1 ,0. , SAME )
COVAL(OUTLET ,ILIQ,0. , SAME )

PATCH(NORTH1 ,PHASEM, 6, 20, 10, 10, 1, 1, 1, 1)
COVAL(NORTH1 ,ILIQ, FIXFLU ,1.0E+05 )

PATCH(SOUTH1 ,PHASEM, 6, 20, 1, 1, 1, 1, 1, 1)
COVAL(SOUTH1 ,ILIQ, FIXFLU ,1.0E+05 )

PATCH(NORTH2 ,NORTH , 1, 20, 10, 10, 1, 1, 1, 1)
COVAL(NORTH2 ,U1 ,-2.0E-03 ,0. )
COVAL(NORTH2 ,AU2 ,-2.0E-03 ,0. )

PATCH(SOUTH2 ,SOUTH , 1, 20, 1, 1, 1, 1, 1, 1)
COVAL(SOUTH2 ,U1 ,-2.0E-03 ,0. )
COVAL(SOUTH2 ,AU2 ,-2.0E-03 ,0. )

PATCH(GRAVITY ,PHASEM, 1, 20, 1, 10, 1, 1, 1, 1)
COVAL(GRAVITY ,U1 , FIXFLU ,-9.81 )
COVAL(GRAVITY ,AU2 , FIXFLU ,-9.81 )
XCYCLE = F
EGWF = T
WALLCO = GRND2
************************************************************
Group 14. Downstream Pressure For PARAB
************************************************************
Group 15. Terminate Sweeps
LSWEEP = 500 ;ISWC1 = 1
LITHYD = 1 ;LITFLX = 1 ;LITC = 1 ;ITHC1 = 1
ISWR1 = 1 ;ISWR2 = 10000
SELREF = T
RESFAC =1.0E-04
************************************************************
Group 16. Terminate Iterations
LITER(P1)=20 ;LITER(U1)=20
LITER(AU2)=20 ;LITER(V1)=1
LITER(BV2)=1 ;LITER(GAS)=1
LITER(LIQ)=1 ;LITER(H1)=20
LITER(ILIQ)=20
ENDIT(P1)=1.0E-03 ;ENDIT(U1)=1.0E-03
ENDIT(AU2)=1.0E-03 ;ENDIT(V1)=1.0E-03
ENDIT(BV2)=1.0E-03 ;ENDIT(GAS)=1.0E-03
ENDIT(LIQ)=1.0E-03 ;ENDIT(H1)=1.0E-03
ENDIT(ILIQ)=1.0E-03
************************************************************
Group 17. Relaxation
RELAX(P1,LINRLX,1.)
RELAX(U1,FALSDT,1.)
RELAX(AU2,FALSDT,0.1)
RELAX(V1,FALSDT,1.0E-03)
RELAX(BV2,FALSDT,1.0E-03)
RELAX(GAS,LINRLX,0.35)
RELAX(LIQ,LINRLX,0.35)
RELAX(H1,FALSDT,1.)
RELAX(ILIQ,FALSDT,0.1)
RELAX(MDOT,LINRLX,1.)
OVRRLX =0.
EXPERT = F ;NNORSL = F
************************************************************
Group 18. Limits
VARMAX(P1)=1.0E+10 ;VARMIN(P1)=-1.0E+10
VARMAX(U1)=1.0E+06 ;VARMIN(U1)=-1.0E+06
VARMAX(AU2)=1.0E+06 ;VARMIN(AU2)=-1.0E+06
VARMAX(V1)=1.0E+06 ;VARMIN(V1)=-1.0E+06
VARMAX(BV2)=1.0E+06 ;VARMIN(BV2)=-1.0E+06
VARMAX(GAS)=1. ;VARMIN(GAS)=1.0E-06
VARMAX(LIQ)=1. ;VARMIN(LIQ)=1.0E-06
VARMAX(H1)=1.0E+10 ;VARMIN(H1)=-1.0E+10
VARMAX(ILIQ)=1.0E+10 ;VARMIN(ILIQ)=-1.0E+10
VARMAX(MDOT)=1.0E+10 ;VARMIN(MDOT)=-1.0E+10
************************************************************
Group 19. Data transmitted to GROUND
PARSOL = F
ISG62 = 1
************************************************************
Group 20. Preliminary Printout
************************************************************
Group 21. Print-out of Variables
INIFLD = F ;SUBWGR = F
* Y in OUTPUT argument list denotes:
* 1-field 2-correction-eq. monitor 3-selective dumping
* 4-whole-field residual 5-spot-value table 6-residual table
OUTPUT(P1,Y,N,Y,Y,Y,Y)
OUTPUT(U1,Y,N,Y,Y,Y,Y)
OUTPUT(AU2,Y,N,Y,Y,Y,Y)
OUTPUT(V1,Y,N,Y,Y,Y,Y)
OUTPUT(BV2,Y,N,Y,Y,Y,Y)
OUTPUT(GAS,Y,N,Y,Y,Y,Y)
OUTPUT(LIQ,Y,N,Y,Y,Y,Y)
OUTPUT(H1,Y,N,Y,Y,Y,Y)
OUTPUT(ILIQ,Y,N,Y,Y,Y,Y)
OUTPUT(MDOT,Y,N,Y,N,N,N)
************************************************************
Group 22. Monitor Print-Out
IXMON = 10 ;IYMON = 5 ;IZMON = 1
NPRMON = 100000 ;NPRMNT = 1 ;TSTSWP = -1
UWATCH = T ;USTEER = T
HIGHLO = F
************************************************************
Group 23.Field Print-Out & Plot Control
NPRINT = 100000 ;NUMCLS = 5
NXPRIN = 4 ;IXPRF = 1 ;IXPRL = 10000
NYPRIN = 2 ;IYPRF = 1 ;IYPRL = 10000
IPLTF = 3 ;IPLTL = 500 ;NPLT = 1
ISWPRF = 1 ;ISWPRL = 100000
ITABL = 3 ;IPROF = 1
ABSIZ =0.5 ;ORSIZ =0.4
NTZPRF = 1 ;NCOLPF = 50
ICHR = 2 ;NCOLCO = 45 ;NROWCO = 20

PATCH(LONGPLOT,PROFIL, 1, 20, 1, 1, 1, 1, 1, 1)
PLOT(LONGPLOT,P1 ,0. ,0. )
PLOT(LONGPLOT,U1 ,-1. ,-1. )
PLOT(LONGPLOT,AU2 ,-1. ,-1. )
PLOT(LONGPLOT,LIQ ,0. ,0. )
PLOT(LONGPLOT,MDOT,0. ,0. )

PATCH(MAP ,CONTUR, 1, 20, 1, 10, 1, 1, 1, 1)
PLOT(MAP ,P1 ,0. ,10. )
PLOT(MAP ,U1 ,0. ,10. )
PLOT(MAP ,AU2 ,0. ,10. )
PLOT(MAP ,GAS ,0. ,10. )
PLOT(MAP ,LIQ ,0. ,10. )
PLOT(MAP ,ILIQ,0. ,10. )
************************************************************
Group 24. Dumps For Restarts
SAVE = T ;NOWIPE = F
NSAVE =CHAM
STOP
```