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

  msg streamlines and potential contours for flow around a cylinder

  gr ou x 1
  msg streamlines
  stre 2d x 1 sh;-1 0 20
  pause
  msg constant-potential contours
  con pot x 1 sh;-0.95 0.95 20
  msg
  msg Press e to END
  ENDUSE
  DISPLAY

  ******************************************************************
  *  Plane potential flow around a closely spaced source-sink pair,*
  *  within a uniform-potential-gradient field, is known to        *
  *  generate a field in which a closed stream-line has the shape  *
  *  of a circular cylinder.                                       *
  *                                                                *
  *  This is illustrated in the present case.                      *
  *                                                                *
  *  A PHOTON USE file is provided to facilitate display.          *
  *                                                                *
  ******************************************************************

  ENDDIS
 ************************************************************
  Group 1. Run Title and Number
 ************************************************************
 ************************************************************
 
 TEXT(Potl. 2D Flow; Source-Sink Pair         )
 
 ************************************************************
 ************************************************************
 
 IRUNN = 1 ;LIBREF = 0
 ************************************************************
  Group 2. Time dependence
 STEADY = T
 ************************************************************
  Group 3. X-Direction Grid Spacing
 CARTES = T
 NX = 1
 XULAST =1.
 XFRAC(1)=1.
 ************************************************************
  Group 4. Y-Direction Grid Spacing
 NY = 40
 YVLAST =1.
 YFRAC(1)=0.025 ;YFRAC(2)=0.05
 YFRAC(3)=0.075 ;YFRAC(4)=0.1
 YFRAC(5)=0.125 ;YFRAC(6)=0.15
 YFRAC(7)=0.175 ;YFRAC(8)=0.2
 YFRAC(9)=0.225 ;YFRAC(10)=0.25
 YFRAC(11)=0.275 ;YFRAC(12)=0.3
 YFRAC(13)=0.325 ;YFRAC(14)=0.35
 YFRAC(15)=0.375 ;YFRAC(16)=0.4
 YFRAC(17)=0.425 ;YFRAC(18)=0.45
 YFRAC(19)=0.475 ;YFRAC(20)=0.5
 YFRAC(21)=0.525 ;YFRAC(22)=0.55
 YFRAC(23)=0.575 ;YFRAC(24)=0.6
 YFRAC(25)=0.625 ;YFRAC(26)=0.65
 YFRAC(27)=0.675 ;YFRAC(28)=0.7
 YFRAC(29)=0.725 ;YFRAC(30)=0.75
 YFRAC(31)=0.775 ;YFRAC(32)=0.8
 YFRAC(33)=0.825 ;YFRAC(34)=0.85
 YFRAC(35)=0.875 ;YFRAC(36)=0.9
 YFRAC(37)=0.925 ;YFRAC(38)=0.95
 YFRAC(39)=0.975 ;YFRAC(40)=1.
 ************************************************************
  Group 5. Z-Direction Grid Spacing
 PARAB = F
 NZ = 80
 ZWLAST =2.
 ZFRAC(1)=0.0125 ;ZFRAC(2)=0.025
 ZFRAC(3)=0.0375 ;ZFRAC(4)=0.05
 ZFRAC(5)=0.0625 ;ZFRAC(6)=0.075
 ZFRAC(7)=0.0875 ;ZFRAC(8)=0.1
 ZFRAC(9)=0.1125 ;ZFRAC(10)=0.125
 ZFRAC(11)=0.1375 ;ZFRAC(12)=0.15
 ZFRAC(13)=0.1625 ;ZFRAC(14)=0.175
 ZFRAC(15)=0.1875 ;ZFRAC(16)=0.2
 ZFRAC(17)=0.2125 ;ZFRAC(18)=0.225
 ZFRAC(19)=0.2375 ;ZFRAC(20)=0.25
 ZFRAC(21)=0.2625 ;ZFRAC(22)=0.275
 ZFRAC(23)=0.2875 ;ZFRAC(24)=0.3
 ZFRAC(25)=0.3125 ;ZFRAC(26)=0.325
 ZFRAC(27)=0.3375 ;ZFRAC(28)=0.35
 ZFRAC(29)=0.3625 ;ZFRAC(30)=0.375
 ZFRAC(31)=0.3875 ;ZFRAC(32)=0.4
 ZFRAC(33)=0.4125 ;ZFRAC(34)=0.425
 ZFRAC(35)=0.4375 ;ZFRAC(36)=0.45
 ZFRAC(37)=0.4625 ;ZFRAC(38)=0.475
 ZFRAC(39)=0.4875 ;ZFRAC(40)=0.5
 ZFRAC(41)=0.5125 ;ZFRAC(42)=0.525
 ZFRAC(43)=0.5375 ;ZFRAC(44)=0.55
 ZFRAC(45)=0.5625 ;ZFRAC(46)=0.575
 ZFRAC(47)=0.5875 ;ZFRAC(48)=0.6
 ZFRAC(49)=0.6125 ;ZFRAC(50)=0.625
 ZFRAC(51)=0.6375 ;ZFRAC(52)=0.65
 ZFRAC(53)=0.6625 ;ZFRAC(54)=0.675
 ZFRAC(55)=0.6875 ;ZFRAC(56)=0.7
 ZFRAC(57)=0.7125 ;ZFRAC(58)=0.725
 ZFRAC(59)=0.7375 ;ZFRAC(60)=0.75
 ZFRAC(61)=0.7625 ;ZFRAC(62)=0.775
 ZFRAC(63)=0.7875 ;ZFRAC(64)=0.8
 ZFRAC(65)=0.8125 ;ZFRAC(66)=0.825
 ZFRAC(67)=0.8375 ;ZFRAC(68)=0.85
 ZFRAC(69)=0.8625 ;ZFRAC(70)=0.875
 ZFRAC(71)=0.8875 ;ZFRAC(72)=0.9
 ZFRAC(73)=0.9125 ;ZFRAC(74)=0.925
 ZFRAC(75)=0.9375 ;ZFRAC(76)=0.95
 ZFRAC(77)=0.9625 ;ZFRAC(78)=0.975
 ZFRAC(79)=0.9875 ;ZFRAC(80)=1.
 ************************************************************
  Group 6. Body-Fitted Coordinates
 ************************************************************
  Group 7. Variables: STOREd,SOLVEd,NAMEd
 ONEPHS = T
 NAME(3)=U1 ;NAME(5)=V1
 NAME(7)=W1 ;NAME(150)=POT
    * Y in SOLUTN argument list denotes:
    * 1-stored 2-solved 3-whole-field
    * 4-point-by-point 5-explicit 6-harmonic averaging 
 SOLUTN(U1,Y,N,N,N,N,Y)
 SOLUTN(V1,Y,N,N,N,N,Y)
 SOLUTN(W1,Y,N,N,N,N,Y)
 SOLUTN(POT,Y,Y,Y,N,N,N)
 ************************************************************
  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(POT,N,N,Y,Y,Y,Y)
 DIFCUT =0.5 ;ZDIFAC =1.
 GALA = F ;ADDDIF = 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.
 ENUL =1.0E-05 ;ENUT =0.
 PRNDTL(POT)=1.
 PRT(POT)=1.
 CP1 =1. ;CP2 =1.
 ************************************************************
  Group 10.Inter-Phase Transfer Processes
 ************************************************************
  Group 11.Initial field variables (PHIs)
 FIINIT(U1)=1.0E-10 ;FIINIT(V1)=1.0E-10
 FIINIT(W1)=1.0E-10 ;FIINIT(POT)=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(UPSTRM ,LOW , 1, 1, 1, 40, 1, 1, 1, 1)
 COVAL(UPSTRM ,POT , FIXVAL ,1. )
 
 PATCH(DWNSTRM ,HIGH , 1, 1, 1, 40, 80, 80, 1, 1)
 COVAL(DWNSTRM ,POT , FIXVAL ,-1. )
 
 PATCH(SOURCE1 ,CELL , 1, 1, 1, 1, 40, 40, 1, 1)
 COVAL(SOURCE1 ,POT , FIXFLU ,10. )
 
 PATCH(SINK1 ,CELL , 1, 1, 1, 1, 41, 41, 1, 1)
 COVAL(SINK1 ,POT , FIXFLU ,-10. )
 XCYCLE = F
 EGWF = T
 WALLCO = GRND2
 ************************************************************
  Group 14. Downstream Pressure For PARAB
 ************************************************************
  Group 15. Terminate Sweeps
 LSWEEP = 3 ;ISWC1 = 1
 LITHYD = 1 ;LITFLX = 1 ;LITC = 1 ;ITHC1 = 1
 SELREF = T
 RESFAC =1.0E-02
 ************************************************************
  Group 16. Terminate Iterations
 LITER(POT)=-100
 ENDIT(POT)=1.0E-03
 ************************************************************
  Group 17. Relaxation
 RELAX(U1,LINRLX,1.)
 RELAX(V1,LINRLX,1.)
 RELAX(W1,LINRLX,1.)
 RELAX(POT,FALSDT,1.0E+09)
 OVRRLX =0.
 EXPERT = F ;NNORSL = F
 ************************************************************
  Group 18. Limits
 VARMAX(U1)=1.0E+06 ;VARMIN(U1)=-1.0E+06
 VARMAX(V1)=1.0E+06 ;VARMIN(V1)=-1.0E+06
 VARMAX(W1)=1.0E+06 ;VARMIN(W1)=-1.0E+06
 VARMAX(POT)=1.0E+10 ;VARMIN(POT)=-1.0E+10
 ************************************************************
  Group 19. Data transmitted to GROUND
 POTVEL = T
 PARSOL = F
 ISG62 = 1
 CSG3    ='CNGR'
 ************************************************************
  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(U1,Y,N,N,N,N,N)
 OUTPUT(V1,Y,N,N,N,N,N)
 OUTPUT(W1,Y,N,N,N,N,N)
 OUTPUT(POT,Y,N,N,N,N,N)
 ************************************************************
  Group 22. Monitor Print-Out
 IXMON = 5 ;IYMON = 5 ;IZMON = 5
 NPRMON = 100000 ;NPRMNT = 1 ;TSTSWP = 1
 UWATCH = T ;USTEER = T
 HIGHLO = F
 ************************************************************
  Group 23.Field Print-Out & Plot Control
 NPRINT = 100000 ;NUMCLS = 5
 NYPRIN = -1 ;IYPRF = 1 ;IYPRL = 10000
 NZPRIN = -1 ;IZPRF = 1 ;IZPRL = 10000
 XZPR = F ;YZPR = T
 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
   No PATCHes yet used for this Group
 ************************************************************
  Group 24. Dumps For Restarts
 SAVE = T ;NOWIPE = F
 NSAVE =CHAM
STOP