TALK=T;RUN(1,1)
  photon use
  p
  parphi
  5 5 1

  view 1 1 1
  msg the grid
  msg press RETURN for temperature contours at successive times
  gr z 1;pause
  do kk=2,20,2
    con temp z kk fi;0.01
  enddo
  msg press RETURN for velocity vectors at successive times
  pause;con off;red
  do kk=2,20,2
    vec z kk sh
  enddo
  msg press RETURN for C1 contours at successive times
  pause
  do kk=2,20,2
    con c1 z kk fi;0.01
  enddo
  enduse
  DISPLAY
  A stationary fluid in a cavity is suddenly exposed to walls of
  unequal temperature. Flow is generated by buoyancy forces
  acting oppositely on hot and cold parts of the fluid.

              ----------------------------
             /|        -------->         |/
             /|                          |/
             /|           --->           |/        |
     Hot     /| ^                        |/ Cold   |
     wall;   /| |    ^                 | |/ wall;  |g
     T=1.0   /| |    |            |    | |/ T=-1.0 |
             /| |         *--     v    | |/        |
             /|              \         v |/        v
             /|          <--- \          |/
             /|                \         |/
             /|        <--------\        |/
              -------------------\--------
         ^                        \
        y|                        P1=0.0 at PATCH REFP
         |--->
           x
  Press RETURN to continue
  The temperature conditions are applied only after the first time
  step so that the correct pressure field can first be established.

  Under-relaxation is applied to V1 for this time step only, so as
  to facilitate quick establishment of the correct pressure, by
  means of the patch called STEP1, with a large CO and with VAL set
  as SAME.

  The 10 * 10 grid is too coarse for accuracy, but may easily be
  refined.

    Other interesting variants include changes to:
  * the aspect ratio of the cavity;
  * the Prandtl number, here taken as 5.0; and
  * the Rayleigh number, here taken as about 1.E6.

  ENDDIS
 ************************************************************
  Group 1. Run Title and Number
 ************************************************************
 ************************************************************
 
 TEXT(Transient Free Convection In A Box      )
 
 ************************************************************
 ************************************************************
 
 IRUNN = 1 ;LIBREF = 340
 ************************************************************
  Group 2. Time dependence
 STEADY = F
    * Set overall time and no. of steps
 TFIRST =0. ;TLAST =40.
 FSTEP = 1 ;LSTEP = 20
 TFRAC(1)=0.05 ;TFRAC(6)=0.3
 TFRAC(11)=0.55 ;TFRAC(16)=0.8
 ************************************************************
  Group 3. X-Direction Grid Spacing
 CARTES = T
 NX = 10
 XULAST =1.
 XFRAC(1)=0.02 ;XFRAC(4)=0.32
 XFRAC(7)=0.82 ;XFRAC(10)=1.
 ************************************************************
  Group 4. Y-Direction Grid Spacing
 NY = 10
 YVLAST =1.
 YFRAC(1)=0.02 ;YFRAC(3)=0.18
 YFRAC(5)=0.5 ;YFRAC(7)=0.82
 YFRAC(9)=0.98
 ************************************************************
  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 = T
 NAME(1)=P1 ;NAME(3)=U1
 NAME(5)=V1 ;NAME(14)=TEMP
 NAME(16)=C1 ;NAME(150)=DEN1
    * 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(V1,Y,Y,N,N,N,Y)
 SOLUTN(TEMP,Y,Y,N,N,N,Y)
 SOLUTN(C1,Y,N,N,N,N,Y)
 SOLUTN(DEN1,Y,N,N,N,N,Y)
 DEN1 = 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(V1,Y,Y,Y,Y,Y,Y)
 TERMS(TEMP,N,Y,Y,Y,Y,Y)
 DIFCUT =0.5 ;ZDIFAC =1.
 GALA = F ;ADDDIF = F
 NEWRH1 = T
 HUNIT =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 = GRND4 ;TMP1 = GRND2
 EL1 =0.
 TSURR =0. ;TEMP0 =0.
 PRESS0 =0.
 DVO1DT =0. ;DRH1DP =0.
 RHO1A =1. ;RHO1B =-1.0E-02
 RHO1C =0.
 TMP1A =0. ;TMP1B =1.
 TMP1C =0.
 TMP2A =0. ;TMP2B =0.
 TMP2C =0.
 EMISS =0. ;SCATT =0.
 RADIA =0. ;RADIB =0.
 ENUL =1.0E-03 ;ENUT =0.
 PRNDTL(U1)=1. ;PRNDTL(V1)=1.
 PRNDTL(TEMP)=5.
 PRT(U1)=1. ;PRT(V1)=1.
 PRT(TEMP)=1.
 CP1 =1. ;CP2 =1.
 ************************************************************
  Group 10.Inter-Phase Transfer Processes
 ************************************************************
  Group 11.Initial field variables (PHIs)
 FIINIT(P1)=0. ;FIINIT(U1)=0.
 FIINIT(V1)=0. ;FIINIT(TEMP)=0.
 FIINIT(C1)=1.0E-10 ;FIINIT(DEN1)=1.0E-10
   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 , 5, 5, 5, 5, 1, 1, 1, 20)
 COVAL(REFP ,P1 ,1. ,0. )
 COVAL(REFP ,U1 ,0. ,0. )
 COVAL(REFP ,V1 ,0. ,0. )
 COVAL(REFP ,TEMP, FIXVAL , SAME )
 
 PATCH(HOTWALL ,WWALL , 1, 1, 1, 10, 1, 1, 2, 20)
 COVAL(HOTWALL ,V1 ,1. ,0. )
 COVAL(HOTWALL ,TEMP,1. ,1. )
 
 PATCH(BUOYANCY,PHASEM, 1, 10, 1, 10, 1, 1, 1, 20)
 COVAL(BUOYANCY,V1 , FIXFLU ,-9.81 )
 
 PATCH(COLDWALL,EWALL , 10, 10, 1, 10, 1, 1, 2, 20)
 COVAL(COLDWALL,V1 ,1. ,0. )
 COVAL(COLDWALL,TEMP,1. ,-1. )
 
 PATCH(TOPWALL ,NWALL , 1, 10, 10, 10, 1, 1, 2, 20)
 COVAL(TOPWALL ,U1 ,1. ,0. )
 
 PATCH(BOTMWALL,SWALL , 1, 10, 1, 1, 1, 1, 2, 20)
 COVAL(BOTMWALL,U1 ,1. ,0. )
 
 PATCH(STEP1 ,CELL , 1, 10, 1, 10, 1, 1, 1, 1)
 COVAL(STEP1 ,V1 ,1.0E+05 , SAME )
 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
 SELREF = T
 RESFAC =1.0E-02
 ************************************************************
  Group 16. Terminate Iterations
 LITER(P1)=20 ;LITER(U1)=10
 LITER(V1)=10 ;LITER(TEMP)=20
 ENDIT(P1)=1.0E-03 ;ENDIT(U1)=1.0E-03
 ENDIT(V1)=1.0E-03 ;ENDIT(TEMP)=1.0E-03
 ************************************************************
  Group 17. Relaxation
 RELAX(P1,LINRLX,1.)
 RELAX(U1,FALSDT,1.)
 RELAX(V1,FALSDT,1.)
 RELAX(TEMP,FALSDT,1.0E+09)
 RELAX(C1,LINRLX,1.)
 RELAX(DEN1,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(V1)=1.0E+06 ;VARMIN(V1)=-1.0E+06
 VARMAX(TEMP)=1.0E+10 ;VARMIN(TEMP)=-1.0E+10
 VARMAX(C1)=1.0E+10 ;VARMIN(C1)=-1.0E+10
 VARMAX(DEN1)=1.0E+10 ;VARMIN(DEN1)=-1.0E+10
 ************************************************************
  Group 19. Data transmitted to GROUND
 PARSOL = F
 ISG62 = 1
 SPEDAT(SET,GXMONI,TRANSIENT,L,F)
 SPEDAT(SET,PRINT,NUMBER,I,5)
 SPEDAT(SET,PRINT,COMMAND1,C,TOTAL_TEMP)
 SPEDAT(SET,PRINT,COMMAND2,C,POW_TEMP_C1)
 SPEDAT(SET,PRINT,POWER,R,0.5)
 SPEDAT(SET,PRINT,COMMAND3,C,MINMAX_U1)
 SPEDAT(SET,PRINT,COMMAND4,C,AVE_C1)
 SPEDAT(SET,PRINT,COMMAND5,C,VALUE_V1)
 SPEDAT(SET,PRINT,IXLOC,I,5)
 SPEDAT(SET,PRINT,IYLOC,I,5)
 SPEDAT(SET,PRINT,IZLOC,I,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,Y,Y,Y,Y,Y)
 OUTPUT(U1,Y,Y,Y,Y,Y,Y)
 OUTPUT(V1,Y,Y,Y,Y,Y,Y)
 OUTPUT(TEMP,Y,Y,Y,Y,Y,Y)
 OUTPUT(C1,Y,N,Y,N,N,N)
 OUTPUT(DEN1,Y,N,Y,N,N,N)
 ************************************************************
  Group 22. Monitor Print-Out
 IXMON = 1 ;IYMON = 9 ;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
 NXPRIN = 3 ;IXPRF = 1 ;IXPRL = 10000
 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(CONT ,CONTUR, 1, 10, 1, 10, 1, 1, 1, 20)
 PLOT(CONT ,TEMP,0. ,10. )
 
 PATCH(IYEQ5 ,PROFIL, 1, 10, 5, 5, 1, 1, 1, 20)
 PLOT(IYEQ5 ,V1 ,-0.1 ,0.1 )
 PLOT(IYEQ5 ,TEMP,0. ,1. )
 
 PATCH(IYEQ9 ,PROFIL, 1, 1, 9, 9, 1, 1, 1, 20)
 PLOT(IYEQ9 ,TEMP,0. ,1. )
 ************************************************************
  Group 24. Dumps For Restarts
 SAVE = T ;NOWIPE = F
 NSAVE =CHAM
 IDISPA = 1 ;IDISPB = 0 ;IDISPC = 0
STOP