```
TALK=T;RUN(1,1)
photon use
p;parphi;;;;;

mesg horizontal direction (z) represents time
gr y 1

msg light-phase volume-fraction contours
con r1 y 1 fi;0.05;pause
msg light-phase velocity contours
con u1 y 1 fi;0.05;pause
msg pressure contours
con p1 y 1 fi;0.05
enduse
DISPLAY

This run analyses the flow which ensues when a channel,which
contains a layer of light fluid resting on a layer of heavy
fluid,is suddenly tilted.

Fluid-to-fluid and fluid-to-wall friction are negelected.

Interesting variants include: changes of both fluid densities;
and changes to the angle of inclination.

PHOTON USE commands are provided.

ENDDIS
************************************************************
Group 1. Run Title and Number
************************************************************
************************************************************

TEXT(SUDDEN TILTING OF TWO-FLUID CHANNEL:W421)

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

IRUNN = 1 ;LIBREF = 14
************************************************************
Group 2. Time dependence
* Set overall time and no. of steps
TFIRST =0. ;TLAST =1.5
FSTEP = 1 ;LSTEP = 30
TFRAC(1)=0.033333 ;TFRAC(2)=0.066667
TFRAC(3)=0.1 ;TFRAC(4)=0.133333
TFRAC(5)=0.166667 ;TFRAC(6)=0.2
TFRAC(7)=0.233333 ;TFRAC(8)=0.266667
TFRAC(9)=0.3 ;TFRAC(10)=0.333333
TFRAC(11)=0.366667 ;TFRAC(12)=0.4
TFRAC(13)=0.433333 ;TFRAC(14)=0.466667
TFRAC(15)=0.5 ;TFRAC(16)=0.533333
TFRAC(17)=0.566667 ;TFRAC(18)=0.6
TFRAC(19)=0.633333 ;TFRAC(20)=0.666667
TFRAC(21)=0.7 ;TFRAC(22)=0.733333
TFRAC(23)=0.766667 ;TFRAC(24)=0.8
TFRAC(25)=0.833333 ;TFRAC(26)=0.866667
TFRAC(27)=0.9 ;TFRAC(28)=0.933333
TFRAC(29)=0.966667 ;TFRAC(30)=1.
************************************************************
Group 3. X-Direction Grid Spacing
CARTES = T
NX = 30
XULAST =0.5
XFRAC(1)=0.033333 ;XFRAC(2)=0.066667
XFRAC(3)=0.1 ;XFRAC(4)=0.133333
XFRAC(5)=0.166667 ;XFRAC(6)=0.2
XFRAC(7)=0.233333 ;XFRAC(8)=0.266667
XFRAC(9)=0.3 ;XFRAC(10)=0.333333
XFRAC(11)=0.366667 ;XFRAC(12)=0.4
XFRAC(13)=0.433333 ;XFRAC(14)=0.466667
XFRAC(15)=0.5 ;XFRAC(16)=0.533333
XFRAC(17)=0.566667 ;XFRAC(18)=0.6
XFRAC(19)=0.633333 ;XFRAC(20)=0.666667
XFRAC(21)=0.7 ;XFRAC(22)=0.733333
XFRAC(23)=0.766667 ;XFRAC(24)=0.8
XFRAC(25)=0.833333 ;XFRAC(26)=0.866667
XFRAC(27)=0.9 ;XFRAC(28)=0.933333
XFRAC(29)=0.966667 ;XFRAC(30)=1.
************************************************************
Group 4. Y-Direction Grid Spacing
NY = 1
YVLAST =1.
YFRAC(1)=1.
************************************************************
Group 5. Z-Direction Grid Spacing
PARAB = F
NZ = 1
ZWLAST =1.
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)=U2 ;NAME(9)=R1
NAME(10)=R2
* 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(U2,Y,Y,N,N,N,Y)
SOLUTN(R1,Y,Y,N,N,N,Y)
SOLUTN(R2,Y,Y,N,N,N,Y)
************************************************************
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(U2,Y,Y,Y,Y,N,Y)
TERMS(R1,Y,Y,N,Y,Y,Y)
TERMS(R2,Y,Y,N,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 =0.8 ;TMP2 =0.
EL2 =0.
DVO2DT =0. ;DRH2DP =0.
ENUL =0. ;ENUT =0.
PHINT(U1)=-2.022E+04 ;PHINT(U2)=-2.022E+04
PHINT(R1)=-2.022E+04 ;PHINT(R2)=-2.022E+04
PRNDTL(U1)=1. ;PRNDTL(U2)=1.
PRT(U1)=1. ;PRT(U2)=1.
CP1 =1. ;CP2 =1.
************************************************************
Group 10.Inter-Phase Transfer Processes
CFIPS =1.
RLOLIM =0. ;CMDOT =0.
CINT(P1)=1. ;CINT(U1)=1.
CINT(U2)=1. ;CINT(R1)=1.
CINT(R2)=1.
PHINT(P1)=-2.022E+04 ;PHINT(U1)=-2.022E+04
PHINT(U2)=-2.022E+04 ;PHINT(R1)=-2.022E+04
PHINT(R2)=-2.022E+04
************************************************************
Group 11.Initial field variables (PHIs)
FIINIT(P1)=1.0E-10 ;FIINIT(U1)=0.
FIINIT(U2)=0. ;FIINIT(R1)=0.5
FIINIT(R2)=0.5
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(BUOYANCY,PHASEM, 1, 30, 1, 1, 1, 1, 1, 30)
COVAL(BUOYANCY,U1 , FIXFLU ,-1.948946 )
COVAL(BUOYANCY,U2 , FIXFLU ,-1.948946 )

PATCH(RELIEF ,CELL , 15, 15, 1, 1, 1, 1, 1, 30)
COVAL(RELIEF ,U1 ,0. ,0. )
COVAL(RELIEF ,R1 ,1. ,0. )
XCYCLE = F
EGWF = T
WALLCO = GRND2
************************************************************
Group 14. Downstream Pressure For PARAB
************************************************************
Group 15. Terminate Sweeps
LSWEEP = 20 ;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)=10
LITER(U2)=10 ;LITER(R1)=1
LITER(R2)=1
ENDIT(P1)=1.0E-03 ;ENDIT(U1)=1.0E-03
ENDIT(U2)=1.0E-03 ;ENDIT(R1)=1.0E-03
ENDIT(R2)=1.0E-03
************************************************************
Group 17. Relaxation
RELAX(P1,LINRLX,1.)
RELAX(U1,FALSDT,1.)
RELAX(U2,FALSDT,1.)
RELAX(R1,LINRLX,1.)
RELAX(R2,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(U2)=1.0E+06 ;VARMIN(U2)=-1.0E+06
VARMAX(R1)=1. ;VARMIN(R1)=1.0E-10
VARMAX(R2)=1. ;VARMIN(R2)=1.0E-10
************************************************************
Group 19. Data transmitted to GROUND
PARSOL = F
ISG62 = 1
SPEDAT(SET,GXMONI,TRANSIENT,L,F)
************************************************************
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(U2,Y,N,Y,Y,Y,Y)
OUTPUT(R1,Y,Y,Y,Y,Y,Y)
OUTPUT(R2,Y,Y,Y,Y,Y,Y)
************************************************************
Group 22. Monitor Print-Out
IXMON = 1 ;IYMON = 1 ;IZMON = 1
NPRMON = 100000 ;NPRMNT = 1 ;TSTSWP = 19
UWATCH = T ;USTEER = T
HIGHLO = F
************************************************************
Group 23.Field Print-Out & Plot Control
NPRINT = 100000 ;NUMCLS = 5
NTPRIN = 100000 ;ISTPRF = 1 ;ISTPRL = 100000
NXPRIN = -1 ;IXPRF = 1 ;IXPRL = 10000
IPLTF = 1 ;IPLTL = -1 ;NPLT = -1
ISWPRF = 1 ;ISWPRL = 100000
ITABL = 1 ;IPROF = 1
ABSIZ =0.5 ;ORSIZ =0.4
NTZPRF = 1 ;NCOLPF = 50
ICHR = 2 ;NCOLCO = 45 ;NROWCO = 20

PATCH(IXPLOT ,PROFIL, 1, 30, 1, 1, 1, 1, 1, 30)
PLOT(IXPLOT ,R1 ,0. ,1. )
************************************************************
Group 24. Dumps For Restarts
SAVE = T ;NOWIPE = F
NSAVE =CHAM
IDISPA = 2 ;IDISPB = 0 ;IDISPC = 0
STOP
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