TALK=T;RUN(1,1)
  PHOTON USE
  p;parphi
  1 5 1



  gr x 1
  msg The grid. Z signifies time. Press RETURN for gas vol. fraction
  pause;gr off;red;gr ou x 1
  msg the volume fraction of gas; press RETURN for pressure
  con gas x 1 fi;0.01;pause;con off;red
  msg the pressure; press RETURN for gas velocity
  con p1 x 1 fi;0.01;pause;con off;red
  msg the gas velocity; press RETURN for liquid velocity
  con av1 x 1 y 1 19 fi;0.01;pause;con off;red
  msg the liquid velocity
  con bv2 x 1 y 1 19 fi;0.01
  enduse
  DISPLAY

    A vertical tube has a closed upper end and two nearby but
    separate apertures in the base. The tube is initially filled
    with water. Air is injected through one of the lower apertures,
    with the result that water is forced out through the other.
    The duration of the calculation is chosen so that all the water
    should just be expelled.

    Bubbles of air rise through the falling stream of water within
    the tube. The task is to calculate the variation with time of
    the profiles of pressure and other variables within the tube.

    PHOTON USE commands are supplied to enable the calculated
    results to be understood.

    Experiments of the above kind have been reported by S.Lo, in
    an Imperial College, London University PhD thesis dated 1985.

  ENDDIS
 ************************************************************
  Group 1. Run Title and Number
 ************************************************************
 ************************************************************
 
 TEXT(WATER DISPLACED BY AIR FROM BELOW  :W895)
 
 ************************************************************
 ************************************************************
 
 IRUNN = 1 ;LIBREF = 14
 ************************************************************
  Group 2. Time dependence
 STEADY = F
    * Set overall time and no. of steps
 TFIRST =0. ;TLAST =10.
 FSTEP = 1 ;LSTEP = 400
 TFRAC(1)=2.5E-03 ;TFRAC(41)=0.1025
 TFRAC(81)=0.2025 ;TFRAC(121)=0.3025
 TFRAC(161)=0.4025 ;TFRAC(201)=0.5025
 TFRAC(241)=0.6025 ;TFRAC(281)=0.7025
 TFRAC(321)=0.8025 ;TFRAC(361)=0.9025
 ************************************************************
  Group 3. X-Direction Grid Spacing
 CARTES = T
 NX = 1
 XULAST =1.
 XFRAC(1)=1.
 ************************************************************
  Group 4. Y-Direction Grid Spacing
 NY = 20
 YVLAST =1.
 YFRAC(1)=0.05 ;YFRAC(3)=0.15
 YFRAC(5)=0.25 ;YFRAC(7)=0.35
 YFRAC(9)=0.45 ;YFRAC(11)=0.55
 YFRAC(13)=0.65 ;YFRAC(15)=0.75
 YFRAC(17)=0.85 ;YFRAC(19)=0.95
 ************************************************************
  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)=AV1
 NAME(6)=BV2 ;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(AV1,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)
 ************************************************************
  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(AV1,Y,Y,N,Y,Y,Y)
 TERMS(BV2,Y,Y,N,Y,N,Y)
 TERMS(GAS,Y,Y,N,Y,Y,Y)
 TERMS(LIQ,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.
 RADIA =0. ;RADIB =0.
 RHO2 =1000. ;TMP2 =0.
 EL2 =0.
 DVO2DT =0. ;DRH2DP =0.
 ENUL =1.0E-05 ;ENUT =0.
 PHINT(AV1)=-2.022E+04 ;PHINT(BV2)=-2.022E+04
 PHINT(GAS)=-2.022E+04 ;PHINT(LIQ)=-2.022E+04
 CP1 =1. ;CP2 =1.
 ************************************************************
  Group 10.Inter-Phase Transfer Processes
 CFIPS =1.0E+04
 RLOLIM =0. ;CMDOT =0.
 CINT(P1)=1. ;CINT(AV1)=1.
 CINT(BV2)=1. ;CINT(GAS)=1.
 CINT(LIQ)=1.
 PHINT(P1)=-2.022E+04 ;PHINT(AV1)=-2.022E+04
 PHINT(BV2)=-2.022E+04 ;PHINT(GAS)=-2.022E+04
 PHINT(LIQ)=-2.022E+04
 ************************************************************
  Group 11.Initial field variables (PHIs)
 FIINIT(P1)=1.0E-10 ;FIINIT(AV1)=1.0E-10
 FIINIT(BV2)=1.0E-10 ;FIINIT(GAS)=1.0E-03
 FIINIT(LIQ)=0.999
   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(AIRIN ,NORTH , 1, 1, 2, 2, 1, 1, 1, 400)
 COVAL(AIRIN ,GAS , FIXFLU ,0.1 )
 
 PATCH(OUTLET ,SOUTH , 1, 1, 1, 1, 1, 1, 1, 400)
 COVAL(OUTLET ,AV1 ,0. ,0. )
 COVAL(OUTLET ,BV2 ,0. ,0. )
 COVAL(OUTLET ,GAS ,1. ,0. )
 COVAL(OUTLET ,LIQ ,1000. ,0. )
 
 PATCH(GRAVTY ,PHASEM, 1, 1, 1, 20, 1, 1, 1, 400)
 COVAL(GRAVTY ,AV1 , FIXFLU ,-9.81 )
 COVAL(GRAVTY ,BV2 , FIXFLU ,-9.81 )
 XCYCLE = F
 EGWF = T
 WALLCO = GRND2
 ************************************************************
  Group 14. Downstream Pressure For PARAB
 ************************************************************
  Group 15. Terminate Sweeps
 LSWEEP = 10 ;ISWC1 = 1
 LITHYD = 1 ;LITFLX = 1 ;LITC = 1 ;ITHC1 = 1
 ISWR1 = 1 ;ISWR2 = 10000
 SELREF = T
 RESFAC =1.0E-06
 ************************************************************
  Group 16. Terminate Iterations
 LITER(P1)=20 ;LITER(AV1)=10
 LITER(BV2)=10 ;LITER(GAS)=1
 LITER(LIQ)=1
 ENDIT(P1)=1.0E-03 ;ENDIT(AV1)=1.0E-03
 ENDIT(BV2)=1.0E-03 ;ENDIT(GAS)=1.0E-03
 ENDIT(LIQ)=1.0E-03
 ************************************************************
  Group 17. Relaxation
 RELAX(P1,LINRLX,1.)
 RELAX(AV1,FALSDT,1.)
 RELAX(BV2,FALSDT,1.)
 RELAX(GAS,LINRLX,0.8)
 RELAX(LIQ,LINRLX,0.8)
 OVRRLX =0.
 EXPERT = F ;NNORSL = F
 ************************************************************
  Group 18. Limits
 VARMAX(P1)=1.0E+10 ;VARMIN(P1)=-1.0E+10
 VARMAX(AV1)=1.0E+06 ;VARMIN(AV1)=-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
 ************************************************************
  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(AV1,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)
 ************************************************************
  Group 22. Monitor Print-Out
 IXMON = 1 ;IYMON = 10 ;IZMON = 1
 NPRMON = 100000 ;NPRMNT = 1 ;TSTSWP = 9
 UWATCH = T ;USTEER = T
 HIGHLO = F
 ************************************************************
  Group 23.Field Print-Out & Plot Control
 NPRINT = 10 ;NUMCLS = 5
 NTPRIN = 40 ;ISTPRF = 1 ;ISTPRL = 100000
 NYPRIN = 2 ;IYPRF = 1 ;IYPRL = 10000
 IPLTF = 1 ;IPLTL = -1 ;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, 400)
 PLOT(LONGPLOT,LIQ ,0. ,0. )
 
 PATCH(TIMEPLOT,PROFIL, 1, 1, 15, 15, 1, 1, 1, 400)
 PLOT(TIMEPLOT,AV1 ,-1. ,-1. )
 PLOT(TIMEPLOT,BV2 ,-1. ,-1. )
 PLOT(TIMEPLOT,GAS ,0. ,0. )
 ************************************************************
  Group 24. Dumps For Restarts
 SAVE = T ;NOWIPE = F
 NSAVE =CHAM
 IDISPA = 20 ;IDISPB = 0 ;IDISPC = 0
STOP