TALK=T;RUN(1,1)
  PHOTON USE
  p;parphi
  1 2.5 1 ;;;;

  msg The grid. The z coordinate represents time
  msg Press return for the pressure contours.
  gr x 1;pause
  gr off;red;gr ou x 1
  msg pressure distribution. Press return for enthalpies
  con p1 x 1 fi;0.1;pause;con off;red
  msg enthalpy distribution. Press e to end, or type other command
  con h1 x 1 fi;0.1
  enduse
  DISPLAY

  The default settings are for a pipe with closed ends, and with
  initially uniform-pressure and -temperature gas in uniform motion.

  A series of intersecting pressure waves results, with
  corresponding variations of enthalpy.

  Other cases involve the gas initially at rest, and the presence
  of time-varying boundary conditions at one end of the pipe. In one
  case the pressure is fixed at an intemediate point.

  Ideal-gas properties are used.

  PHOTON USE commands are provided.

  ENDDIS
 ************************************************************
  Group 1. Run Title and Number
 ************************************************************
 ************************************************************
 
 TEXT(GAS_AT_REST._SUDDEN_SUSTAINED_ENTRY_FROM)
 
 ************************************************************
 ************************************************************
 
 IRUNN = 1 ;LIBREF = 14
 ************************************************************
  Group 2. Time dependence
 STEADY = F
    * Set overall time and no. of steps
 TFIRST =0. ;TLAST =5.
 FSTEP = 1 ;LSTEP = 500
 TFRAC(1)=2.0E-03 ;TFRAC(126)=0.252
 TFRAC(251)=0.502 ;TFRAC(376)=0.752
 ************************************************************
  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(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 = T
 NAME(1)=P1 ;NAME(5)=V1
 NAME(14)=H1
    * 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(H1,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,Y,Y,Y,Y)
 TERMS(H1,Y,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 = GRND5 ;TMP1 = GRND2 ;EL1 =0.
 TSURR =0. ;TEMP0 =0. ;PRESS0 =1.
 DVO1DT =0. ;DRH1DP =1.
 RHO1A =0. ;RHO1B =1. ;RHO1C =0.
 TMP1A =0. ;TMP1B =0.285714 ;TMP1C =0.
 TMP2A =0. ;TMP2B =0. ;TMP2C =0.
 EMISS =0. ;SCATT =0.
 RADIA =0. ;RADIB =0.
 ENUL =1.0E-05 ;ENUT =0.
 PRNDTL(V1)=1. ;PRNDTL(H1)=1.
 PRT(V1)=1. ;PRT(H1)=1.
 CP1 =3.5 ;CP2 =1.
 ************************************************************
  Group 10.Inter-Phase Transfer Processes
 ************************************************************
  Group 11.Initial field variables (PHIs)
 FIINIT(P1)=0. ;FIINIT(V1)=0.
 FIINIT(H1)=3.5
   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(TIMN ,NORTH , 1, 1, 20, 20, 1, 1, 1, 500)
 COVAL(TIMN ,P1 , FIXFLU , GRND1 )
 COVAL(TIMN ,V1 ,0. ,-0.5 )
 COVAL(TIMN ,H1 ,0. ,14.000001 )
 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
 SELREF = T
 RESFAC =1.0E-03
 ************************************************************
  Group 16. Terminate Iterations
 LITER(P1)=20 ;LITER(V1)=10
 LITER(H1)=20
 ENDIT(P1)=1.0E-03 ;ENDIT(V1)=1.0E-03
 ENDIT(H1)=1.0E-03
 ************************************************************
  Group 17. Relaxation
 RELAX(P1,LINRLX,1.)
 RELAX(V1,FALSDT,1.)
 RELAX(H1,FALSDT,1.0E+09)
 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(H1)=1.0E+10 ;VARMIN(H1)=0.5
 ************************************************************
  Group 19. Data transmitted to GROUND
 PARSOL = F
 ITIMA = 1000
 ISG62 = 1
 TIMA =0.5
 SPEDAT(SET,GXMONI,PLOTALL,L,T)
 ************************************************************
  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(V1,Y,N,Y,Y,Y,Y)
 OUTPUT(H1,Y,N,Y,Y,Y,Y)
 ************************************************************
  Group 22. Monitor Print-Out
 IXMON = 1 ;IYMON = 1 ;IZMON = 1
 NPRMON = 100000 ;NPRMNT = 1 ;TSTSWP = 10
 UWATCH = T ;USTEER = T
 HIGHLO = F
 ************************************************************
  Group 23.Field Print-Out & Plot Control
 NPRINT = 100000 ;NUMCLS = 5
 NTPRIN = 125 ;ISTPRF = 1 ;ISTPRL = 100000
 NYPRIN = 1 ;IYPRF = 1 ;IYPRL = 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(PROFILES,PROFIL, 1, 1, 10, 10, 1, 1, 1, 500)
 PLOT(PROFILES,P1 ,0. ,0. )
 PLOT(PROFILES,V1 ,0. ,0. )
 ************************************************************
  Group 24. Dumps For Restarts
 SAVE = T ;NOWIPE = F
 NSAVE =CHAM
 IDISPA = 10 ;IDISPB = 1 ;IDISPC = 500
STOP