TALK=T;RUN(1,1)
  PHOTON USE
  p; parphi;  1 1 500

  gr ou y 1
  msg pressure; distance is vertical, time horizontal
  con p1 y 1 fi;1
  msg Press  to continue
  pause;con off;red
  msg velocity; distance is vertical, time horizontal
  con u1 y 1 fi;1
  enduse
  DISPLAY
  Air is moving steadily along a pipe. Valves are suddenly closed
  at each end, bringing the air to rest there. The subsequent
  distributions of velocity and pressure in the pipe are to be
  predicted.

  The analysis is one-dimensional, and the process is supposd to
  be isentropic, ie without either friction or heat transfer.

  ENDDIS
 ************************************************************
  Group 1. Run Title and Number
 ************************************************************
 ************************************************************
 
 TEXT(Pressure Waves From Valve Closure       )
 
 ************************************************************
 ************************************************************
 
 IRUNN = 1 ;LIBREF = 0
 ************************************************************
  Group 2. Time dependence
 STEADY = F
    * Set overall time and no. of steps
 TFIRST =0. ;TLAST =1.0E-02
 FSTEP = 1 ;LSTEP = 100
 TFRAC(1)=1.0E-02 ;TFRAC(21)=0.21
 TFRAC(41)=0.41 ;TFRAC(61)=0.61
 TFRAC(81)=0.81
 ************************************************************
  Group 3. X-Direction Grid Spacing
 CARTES = T
 NX = 100
 XULAST =2.
 XFRAC(1)=1.0E-02 ;XFRAC(21)=0.21
 XFRAC(41)=0.41 ;XFRAC(61)=0.61
 XFRAC(81)=0.81
 ************************************************************
  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 = T
 NAME(1)=P1 ;NAME(3)=U1
 NAME(149)=PRPS ;NAME(150)=RHO1
    * 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(PRPS,Y,N,N,N,N,Y)
 SOLUTN(RHO1,Y,N,N,N,N,Y)
 DEN1 = 150
 PRPS = 149
 ************************************************************
  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,N,Y,Y,Y)
 DIFCUT =0.5 ;ZDIFAC =1.
 GALA = F ;ADDDIF = F
 NEWRH1 = T
 ISOLX = -1 ;ISOLY = -1 ;ISOLZ = -1
 ************************************************************
  Group 9. Properties used if PRPS is not
  stored, and where PRPS = -1.0 if it is!
 RHO1 = GRND3 ;TMP1 =0.
 EL1 =0.
 TSURR =0. ;TEMP0 =0.
 PRESS0 =0.
 DVO1DT =3.33E-03 ;DRH1DP = GRND3
 RHO1A =2.682563E-04 ;RHO1B =0.71429
 RHO1C =0.
 EMISS =0. ;SCATT =0.
 RADIA =0. ;RADIB =0.
 ENUL =1.569E-05 ;ENUT =0.
 CP1 =1007. ;CP2 =1.
 ************************************************************
  Group 10.Inter-Phase Transfer Processes
 ************************************************************
  Group 11.Initial field variables (PHIs)
 FIINIT(P1)=1.0E+05 ;FIINIT(U1)=1.
 FIINIT(PRPS)=-1. ;FIINIT(RHO1)=1.
   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
   No PATCHes yet used for this Group
 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-04
 ************************************************************
  Group 16. Terminate Iterations
 LITER(P1)=20 ;LITER(U1)=10
 ENDIT(P1)=1.0E-03 ;ENDIT(U1)=1.0E-03
 ************************************************************
  Group 17. Relaxation
 RELAX(P1,LINRLX,1.)
 RELAX(U1,FALSDT,1.)
 RELAX(PRPS,LINRLX,1.)
 RELAX(RHO1,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(PRPS)=1.0E+10 ;VARMIN(PRPS)=-1.0E+10
 VARMAX(RHO1)=1.0E+10 ;VARMIN(RHO1)=-1.0E+10
 ************************************************************
  Group 19. Data transmitted to GROUND
 PARSOL = F
 IDISPB = 1 ;IDISPC = 100
 ISG62 = 1
 SPEDAT(SET,DOMAIN,PHASE_1_MAT,I,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(U1,Y,N,Y,Y,Y,Y)
 OUTPUT(PRPS,Y,N,Y,N,N,N)
 OUTPUT(RHO1,Y,N,Y,N,N,N)
 ************************************************************
  Group 22. Monitor Print-Out
 IXMON = 50 ;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 = 20 ;ISTPRF = 1 ;ISTPRL = 100000
 NXPRIN = 20 ;IXPRF = 1 ;IXPRL = 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(ALLX ,PROFIL, 1, 100, 1, 1, 1, 1, 1, 100)
 PLOT(ALLX ,P1 ,0. ,0. )
 PLOT(ALLX ,U1 ,0. ,0. )
 
 PATCH(TIMEPLOT,PROFIL, 50, 50, 1, 1, 1, 1, 1, 100)
 PLOT(TIMEPLOT,P1 ,0. ,0. )
 PLOT(TIMEPLOT,U1 ,0. ,0. )
 ************************************************************
  Group 24. Dumps For Restarts
 SAVE = T ;NOWIPE = F
 NSAVE =CHAM
 IDISPA = 1 ;IDISPB = 1 ;IDISPC = 100
STOP