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

gr ou x 1
MSG Velocity vectors
vec x 1 sh
msg
pause
cont p1 x 1 fil;.01
msg
msg Type e to End
ENDUSE
DISPLAY
This case defines a calculation of the potential flow
about a half cylinder in a duct in the y-z plane. The
grid is generated by PIL commands giving a 'shear
transformation' and is non-orthogonal; so NONORT is set T.

The potential calculation is contrived by introducing a
uniform high resistance throughout the flow field. This
'Darcy' flow is mathematically equivalent to potential
flow.

This is done in Group 13 by setting DARCY=T, which
creates the appropriate PATCH and COVAL settings.  An
analytical solution exists for this case to which the
results may be compared (see Milne-Thompson, 1962,
'Theoretical Hydrodynamics')
ENDDIS
************************************************************
Group 1. Run Title and Number
************************************************************
************************************************************

TEXT(POTENTIAL FLOW AROUND 1/2 CYLINDER: B514)

************************************************************
************************************************************

IRUNN = 1 ;LIBREF = 514
************************************************************
Group 2. Time dependence
************************************************************
Group 3. X-Direction Grid Spacing
CARTES = T
NX = 1
XULAST =1.
************************************************************
Group 4. Y-Direction Grid Spacing
NY = 10
YVLAST =1.
************************************************************
Group 5. Z-Direction Grid Spacing
PARAB = F
NZ = 20
ZWLAST =2.
************************************************************
Group 6. Body-Fitted Coordinates
BFC = T ;NONORT = T
NCRT = -1
RSTGEO = F ;SAVGEO = F
UUP = F ;VUP = F ;WUP = F
NGEOM =CHAM
NAMXYZ =CHAM
ANGMIN =20.
DOMAIN(   1,   1,   1,  11,   1,  21)
* Set fixed sub-domain
FIXDOM(   1,   0,   0,   0,   0,   0,   0)
FIXDOM(   2,   0,   0,   0,   0,   0,   0)
FIXDOM(   3,   0,   0,   0,   0,   0,   0)
FIXDOM(   4,   0,   0,   0,   0,   0,   0)
FIXDOM(   5,   0,   0,   0,   0,   0,   0)
FIXDOM(   6,   0,   0,   0,   0,   0,   0)
FIXDOM(   7,   0,   0,   0,   0,   0,   0)
FIXDOM(   8,   0,   0,   0,   0,   0,   0)
FIXDOM(   9,   0,   0,   0,   0,   0,   0)
FIXDOM(  10,   0,   0,   0,   0,   0,   0)
LIJ = F ;LJK = T ;LIK = F
IMON = 1 ;JMON = 6 ;KMON = 11
************************************************************
Group 7. Variables: STOREd,SOLVEd,NAMEd
ONEPHS = T
NAME(1)=P1 ;NAME(5)=V1
NAME(7)=W1 ;NAME(148)=WCRT
NAME(149)=VCRT ;NAME(150)=UCRT
* 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,Y,N,N,N)
SOLUTN(V1,Y,Y,N,N,N,N)
SOLUTN(W1,Y,Y,N,N,N,N)
SOLUTN(WCRT,Y,N,N,N,N,N)
SOLUTN(VCRT,Y,N,N,N,N,N)
SOLUTN(UCRT,Y,N,N,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(P1,Y,Y,Y,N,Y,Y)
TERMS(V1,Y,N,N,N,Y,N)
TERMS(W1,Y,N,N,N,Y,N)
DIFCUT =0.5 ;ZDIFAC =1.
GALA = F ;ADDDIF = F
ISOLX = 0 ;ISOLY = 0 ;ISOLZ = 0
************************************************************
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.
ENUL =1.0E-10 ;ENUT =0.
CP1 =1. ;CP2 =1.
************************************************************
Group 10.Inter-Phase Transfer Processes
************************************************************
Group 11.Initial field variables (PHIs)
FIINIT(P1)=1.0E-10 ;FIINIT(V1)=1.0E-10
FIINIT(W1)=1. ;FIINIT(WCRT)=1.0E-10
FIINIT(VCRT)=1.0E-10 ;FIINIT(UCRT)=1.0E-10
No PATCHes yet used for this Group
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(INLET ,LOW , 1, 1, 1, 10, 1, 1, 1, 1)
COVAL(INLET ,P1 , FIXFLU ,1. )

PATCH(OUTLET ,HIGH , 1, 1, 1, 10, 20, 20, 1, 1)
COVAL(OUTLET ,P1 ,1. ,0. )

PATCH(DARCY ,PHASEM, 0, 0, 0, 0, 0, 0, 1, 1)
COVAL(DARCY ,V1 ,1.0E+04 ,0. )
COVAL(DARCY ,W1 ,1.0E+04 ,0. )
XCYCLE = F
EGWF = T
WALLCO = GRND2
DARCY = T
DARCON =1.0E+04
************************************************************
Group 14. Downstream Pressure For PARAB
************************************************************
Group 15. Terminate Sweeps
LSWEEP = 200 ;ISWC1 = 1
LITHYD = 1 ;LITFLX = 1 ;LITC = 1 ;ITHC1 = 1
SELREF = F
RESREF(P1)=1.0E-08 ;RESREF(V1)=1.0E-08
RESREF(W1)=1.0E-08
************************************************************
Group 16. Terminate Iterations
LITER(P1)=-2000 ;LITER(V1)=10
LITER(W1)=10
ENDIT(P1)=-1. ;ENDIT(V1)=1.0E-03
ENDIT(W1)=1.0E-03
************************************************************
Group 17. Relaxation
RELAX(P1,LINRLX,1.)
RELAX(V1,FALSDT,1.0E+20)
RELAX(W1,FALSDT,1.0E+20)
RELAX(WCRT,LINRLX,1.)
RELAX(VCRT,LINRLX,1.)
RELAX(UCRT,LINRLX,1.)
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(W1)=1.0E+06 ;VARMIN(W1)=-1.0E+06
VARMAX(WCRT)=1.0E+10 ;VARMIN(WCRT)=-1.0E+10
VARMAX(VCRT)=1.0E+10 ;VARMIN(VCRT)=-1.0E+10
VARMAX(UCRT)=1.0E+10 ;VARMIN(UCRT)=-1.0E+10
************************************************************
Group 19. Data transmitted to GROUND
PARSOL = F
ISG62 = 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(V1,N,N,Y,Y,N,N)
OUTPUT(W1,N,N,Y,Y,N,N)
OUTPUT(WCRT,Y,N,Y,N,N,N)
OUTPUT(VCRT,Y,N,Y,N,N,N)
OUTPUT(UCRT,Y,N,Y,N,N,N)
************************************************************
Group 22. Monitor Print-Out
IXMON = 1 ;IYMON = 3 ;IZMON = 10
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 = 5 ;IZPRL = 15
XZPR = F ;YZPR = F
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(YZ ,CONTUR, 1, 1, 1, 10, 1, 20, 1, 1)
PLOT(YZ ,P1 ,0. ,20. )
PLOT(YZ ,W1 ,0. ,20. )

PATCH(INNER ,PROFIL, 1, 1, 1, 1, 1, 20, 1, 1)
PLOT(INNER ,P1 ,0. ,0. )
PLOT(INNER ,W1 ,0. ,0. )
************************************************************
Group 24. Dumps For Restarts
SAVE = T ;NOWIPE = F
NSAVE =CHAM
STOP
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