```
TALK=T;RUN(1,1)
AUTOPLOT USE
file
phi 5

da 1
v1
screen
msg 1st-phase velocity at t=4000s
pl 1
msg press  to continue
pause
cl
da 1
v2
screen
msg 2nd-phase velocity at t=4000s
pl 1
msg press  to continue
pause
cl
da 1
r1
screen
msg 1st-phase volume fraction at t=4000s
pl 1
msg press  to continue
pause
cl
da 1
r2
screen
msg 2nd-phase volume fraction at t=4000s
pl 1
msg press  to continue
pause
cl
da 1
p1
screen
msg pressure at t=4000s
pl 1
msg press e to END
enduse
DISPLAY
The problem involves the falling of a denser fluid through a
lighter one, under conditions in which the inertia terms are
negligible, and the density differences are slight.
An analytical solution exists for this problem.
ENDDIS
************************************************************
Group 1. Run Title and Number
************************************************************
************************************************************

TEXT(SEDIMENTATION WITH SMALLER FRICTION W893)

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

IRUNN = 1 ;LIBREF = 892
************************************************************
Group 2. Time dependence
* Set overall time and no. of steps
TFIRST =0. ;TLAST =4000.
FSTEP = 1 ;LSTEP = 40
Method of pairs used for grid setting.
TFRAC(1)=-600. ;TFRAC(6)=0.15
TFRAC(11)=0.275 ;TFRAC(16)=0.4
TFRAC(21)=0.525 ;TFRAC(26)=0.65
TFRAC(31)=0.775 ;TFRAC(36)=0.9
************************************************************
Group 3. X-Direction Grid Spacing
CARTES = T
NX = 1
XULAST =1.
XFRAC(1)=1.
************************************************************
Group 4. Y-Direction Grid Spacing
NY = 20
YVLAST =2.
YFRAC(1)=0.05 ;YFRAC(2)=0.1
YFRAC(3)=0.15 ;YFRAC(4)=0.2
YFRAC(5)=0.25 ;YFRAC(6)=0.3
YFRAC(7)=0.35 ;YFRAC(8)=0.4
YFRAC(9)=0.45 ;YFRAC(10)=0.5
YFRAC(11)=0.55 ;YFRAC(12)=0.6
YFRAC(13)=0.65 ;YFRAC(14)=0.7
YFRAC(15)=0.75 ;YFRAC(16)=0.8
YFRAC(17)=0.85 ;YFRAC(18)=0.9
YFRAC(19)=0.95 ;YFRAC(20)=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(5)=V1
NAME(6)=V2 ;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(V1,Y,Y,N,N,N,Y)
SOLUTN(V2,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(V1,Y,Y,N,Y,Y,Y)
TERMS(V2,Y,Y,N,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 =0.999 ;TMP2 =0.
EL2 =0.
DVO2DT =0. ;DRH2DP =0.
ENUL =0. ;ENUT =0.
PHINT(V1)=-2.022E+04 ;PHINT(V2)=-2.022E+04
PHINT(R1)=-2.022E+04 ;PHINT(R2)=-2.022E+04
CP1 =1. ;CP2 =1.
************************************************************
Group 10.Inter-Phase Transfer Processes
CFIPS =2.
RLOLIM =1.0E-02 ;CMDOT =0.
CINT(P1)=1. ;CINT(V1)=1.
CINT(V2)=1. ;CINT(R1)=1.
CINT(R2)=1.
PHINT(P1)=-2.022E+04 ;PHINT(V1)=-2.022E+04
PHINT(V2)=-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(V1)=1.0E-10
FIINIT(V2)=1.0E-10 ;FIINIT(R1)=1.
FIINIT(R2)=0.

PATCH(START ,INIVAL, 1, 1, 11, 20, 1, 1, 1, 1)
INIT(START ,R1 ,0. ,-1. )
INIT(START ,R2 ,0. ,1. )
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(BOTTOM ,CELL , 1, 1, 1, 1, 1, 1, 1, 40)
COVAL(BOTTOM ,V1 ,0. ,0. )
COVAL(BOTTOM ,V2 ,0. ,0. )
COVAL(BOTTOM ,R1 ,1. ,0. )
COVAL(BOTTOM ,R2 ,1. ,0. )

PATCH(WEIGHT ,PHASEM, 1, 1, 1, 20, 1, 1, 1, 40)
COVAL(WEIGHT ,V1 , FIXFLU ,0.9995 )
XCYCLE = F
EGWF = T
WALLCO = GRND2
************************************************************
Group 14. Downstream Pressure For PARAB
************************************************************
Group 15. Terminate Sweeps
LSWEEP = 50 ;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(V1)=10
LITER(V2)=10 ;LITER(R1)=1
LITER(R2)=1
ENDIT(P1)=1.0E-03 ;ENDIT(V1)=1.0E-03
ENDIT(V2)=1.0E-03 ;ENDIT(R1)=1.0E-03
ENDIT(R2)=1.0E-03
************************************************************
Group 17. Relaxation
RELAX(P1,LINRLX,1.)
RELAX(V1,FALSDT,1.0E-02)
RELAX(V2,FALSDT,1.0E-02)
RELAX(R1,FALSDT,0.4)
RELAX(R2,FALSDT,0.4)
OVRRLX =0.
EXPERT = F ;NNORSL = F
************************************************************
Group 18. Limits
VARMAX(P1)=1.0E+10 ;VARMIN(P1)=-1.0E+10
VARMAX(V1)=1.0E+06 ;VARMIN(V1)=-1.0E+06
VARMAX(V2)=1.0E+06 ;VARMIN(V2)=-1.0E+06
VARMAX(R1)=1. ;VARMIN(R1)=1.0E-05
VARMAX(R2)=1. ;VARMIN(R2)=1.0E-05
************************************************************
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,Y,Y,Y,Y,Y)
OUTPUT(V1,Y,Y,Y,Y,Y,Y)
OUTPUT(V2,Y,Y,Y,Y,Y,Y)
OUTPUT(R1,Y,N,Y,Y,Y,Y)
OUTPUT(R2,Y,Y,Y,Y,Y,Y)
************************************************************
Group 22. Monitor Print-Out
IXMON = 1 ;IYMON = 10 ;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
NTPRIN = 5 ;ISTPRF = 1 ;ISTPRL = 100000
NYPRIN = -1 ;IYPRF = 1 ;IYPRL = 10000
IPLTF = 1 ;IPLTL = 50 ;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, 1, 1, 20, 1, 1, 1, 40)
PLOT(LONGPLOT,R1 ,0. ,1. )

PATCH(TIMEPLOT,PROFIL, 1, 1, 10, 10, 1, 1, 1, 40)
PLOT(TIMEPLOT,V1 ,0. ,0. )
PLOT(TIMEPLOT,V2 ,0. ,0. )
************************************************************
Group 24. Dumps For Restarts
SAVE = T ;NOWIPE = F
NSAVE =CHAM
STOP
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