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

  da 1
  au1
  screen
  msg 1st-phase (gas) velocity at t=50s
  pl 1
  msg press  to continue
  pause
  cl
  da 1
  bu2
  screen
  msg 2nd-phase (liquid) velocity at t=50s
  pl 1
  msg press  to continue
  pause
  cl
  da 1
  gas
  screen
  msg 1st-phase (gas) volume fraction at t=50s
  pl 1
  msg press  to continue
  pause
  cl
  da 1
  liq
  screen
  msg 2nd-phase (liquid) volume fraction at t=50s
  pl 1
  msg press  to continue
  pause
  cl
  da 1
  p1
  screen
  msg pressure at t=50s
  pl 1
  msg press e to END
  enduse
  DISPLAY
  Water enters the base of an air-filled pipe at a steady
  rate, finally filling it.

  Numerical diffusion causes the interface to become diffuse,
  to some extent; but the tendency is diminished by the
  activation of the "donor-acceptor" option, set by DONACC=T.
  This may be confirmed by setting DONACC=F and re-running.

  Also relevant, and to be experimented with, are the settings
  of the upper- and lower-limit volume-fraction limits at which
  upwind rather than downwind values are employed in the
  balance equations. These are RUPLIM and RLOLIM. See group 8.
  ENDDIS
 ************************************************************
  Group 1. Run Title and Number
 ************************************************************
 ************************************************************
 
 TEXT(1D TRANSIENT PIPE FILLING :         W425)
 
 ************************************************************
 ************************************************************
 
 IRUNN = 1 ;LIBREF = 14
 ************************************************************
  Group 2. Time dependence
 STEADY = F
    * Set overall time and no. of steps
 TFIRST =0. ;TLAST =50.
 FSTEP = 1 ;LSTEP = 10
 TFRAC(10)=1.
 ************************************************************
  Group 3. X-Direction Grid Spacing
 CARTES = T
 NX = 10
 XULAST =1.
 XFRAC(1)=0.1 ;XFRAC(2)=0.2
 XFRAC(3)=0.3 ;XFRAC(4)=0.4
 XFRAC(5)=0.5 ;XFRAC(6)=0.6
 XFRAC(7)=0.7 ;XFRAC(8)=0.8
 XFRAC(9)=0.9 ;XFRAC(10)=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)=AU1
 NAME(4)=BU2 ;NAME(9)=GAS
 NAME(10)=LIQ
    * 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(AU1,Y,Y,N,N,N,Y)
 SOLUTN(BU2,Y,Y,N,N,N,Y)
 SOLUTN(GAS,Y,Y,N,N,N,Y)
 SOLUTN(LIQ,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(AU1,Y,Y,Y,Y,Y,Y)
 TERMS(BU2,Y,Y,Y,Y,N,Y)
 TERMS(GAS,Y,Y,Y,Y,Y,Y)
 TERMS(LIQ,Y,Y,Y,Y,N,Y)
 DIFCUT =0.5 ;ZDIFAC =1.
 GALA = F ;ADDDIF = F
 EQDVDP = F
 DONACC = T
 RUPLIM =0.9 ;RLOLIM =0.1
 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.
 RADIA =0. ;RADIB =0.
 RHO2 =1000. ;TMP2 =0.
 EL2 =0.
 DVO2DT =0. ;DRH2DP =0.
 ENUL =1.0E-03 ;ENUT =0.
 PHINT(AU1)=-2.022E+04 ;PHINT(BU2)=-2.022E+04
 PHINT(GAS)=-2.022E+04 ;PHINT(LIQ)=-2.022E+04
 PRNDTL(AU1)=1. ;PRNDTL(BU2)=1.
 PRNDTL(GAS)=1. ;PRNDTL(LIQ)=1.
 PRT(AU1)=1. ;PRT(BU2)=1.
 PRT(GAS)=1. ;PRT(LIQ)=1.
 CP1 =1. ;CP2 =1.
 ************************************************************
  Group 10.Inter-Phase Transfer Processes
 CFIPS =1.0E+04
 RLOLIM =0.1 ;CMDOT =0.
 CINT(P1)=1. ;CINT(AU1)=1.
 CINT(BU2)=1. ;CINT(GAS)=1.
 CINT(LIQ)=1.
 PHINT(P1)=-2.022E+04 ;PHINT(AU1)=-2.022E+04
 PHINT(BU2)=-2.022E+04 ;PHINT(GAS)=-2.022E+04
 PHINT(LIQ)=-2.022E+04
 ************************************************************
  Group 11.Initial field variables (PHIs)
 FIINIT(P1)=0. ;FIINIT(AU1)=0.
 FIINIT(BU2)=0. ;FIINIT(GAS)=0.99999
 FIINIT(LIQ)=1.0E-06
   No PATCHes yet used for this Group
 INIADD = F
 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(REFP ,CELL , 10, 10, 1, 1, 1, 1, 1, 10)
 COVAL(REFP ,GAS ,1. ,0. )
 
 PATCH(INLET ,WEST , 1, 1, 1, 1, 1, 1, 1, 10)
 COVAL(INLET ,LIQ , FIXFLU ,10. )
 
 PATCH(GRAVITY ,PHASEM, 1, 10, 1, 1, 1, 1, 1, 10)
 COVAL(GRAVITY ,AU1 , FIXFLU ,-9.81 )
 COVAL(GRAVITY ,BU2 , FIXFLU ,-9.81 )
 XCYCLE = F
 EGWF = T
 WALLCO = GRND2
 ************************************************************
  Group 14. Downstream Pressure For PARAB
 ************************************************************
  Group 15. Terminate Sweeps
 LSWEEP = 40 ;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(AU1)=10
 LITER(BU2)=10 ;LITER(GAS)=1
 LITER(LIQ)=1
 ENDIT(P1)=1.0E-03 ;ENDIT(AU1)=1.0E-03
 ENDIT(BU2)=1.0E-03 ;ENDIT(GAS)=1.0E-03
 ENDIT(LIQ)=1.0E-03
 ************************************************************
  Group 17. Relaxation
 RELAX(P1,LINRLX,1.)
 RELAX(AU1,FALSDT,1.0E-02)
 RELAX(BU2,FALSDT,1.0E-02)
 RELAX(GAS,LINRLX,1.)
 RELAX(LIQ,LINRLX,1.)
 OVRRLX =0.
 EXPERT = F ;NNORSL = F
 ************************************************************
  Group 18. Limits
 VARMAX(P1)=1.0E+10 ;VARMIN(P1)=-1.0E+10
 VARMAX(AU1)=1.0E+06 ;VARMIN(AU1)=-1.0E+06
 VARMAX(BU2)=1.0E+06 ;VARMIN(BU2)=-1.0E+06
 VARMAX(GAS)=1. ;VARMIN(GAS)=1.0E-06
 VARMAX(LIQ)=1. ;VARMIN(LIQ)=1.0E-06
 ************************************************************
  Group 19. Data transmitted to GROUND
 USEGRD = F ;USEGRX = F
 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(AU1,Y,N,Y,Y,Y,Y)
 OUTPUT(BU2,Y,N,Y,Y,Y,Y)
 OUTPUT(GAS,N,N,N,N,N,N)
 OUTPUT(LIQ,Y,N,Y,Y,Y,Y)
 ************************************************************
  Group 22. Monitor Print-Out
 IXMON = 1 ;IYMON = 1 ;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 = 10 ;ISTPRF = 1 ;ISTPRL = 100000
 NXPRIN = -1 ;IXPRF = 1 ;IXPRL = 10000
 IPLTF = 1 ;IPLTL = 100 ;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(ALLX ,PROFIL, 1, 10, 1, 1, 1, 1, 1, 10)
 PLOT(ALLX ,P1 ,0. ,0. )
 PLOT(ALLX ,LIQ ,0. ,1. )
 
 PATCH(LONGPLOT,PROFIL, 1, 1, 1, 1, 1, 1, 1, 10)
 PLOT(LONGPLOT,P1 ,0. ,0. )
 PLOT(LONGPLOT,LIQ ,0. ,1. )
 ************************************************************
  Group 24. Dumps For Restarts
 SAVE = T ;NOWIPE = F
 NSAVE =CHAM
STOP