```
TALK=T;RUN(1,1)
DISPLAY
This is an example of the application of the
two-fluid model of turbulence to non-reacting,
turbulent flow over a backward-facing step, as
illustrated:

////////////////////////////////////////////////
Inlet                                       Exit
-------->
W2                                   ---------->
////////////
/  Recirculation
/ <----                    ------->
/////////////////////////////////////

The geometry considered has a expansion ratio of 1.5
and an exit width of 3h, where h is the step height.
The calculations are started at x=-4h and terminated
at x=16h. The flow is incompressible.

In the present calculations, the fluid 1 is defined as
that which moves away from the stepped wall and fluid 2
as that moves towards it respectively.
ENDDIS
************************************************************
Group 1. Run Title and Number
************************************************************
************************************************************

TEXT(Backward-Facing Step;2-Fluid Model: 976 )

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

IRUNN = 1 ;LIBREF = 14
************************************************************
Group 2. Time dependence
************************************************************
Group 3. X-Direction Grid Spacing
CARTES = T
NX = 1
XULAST =1.
XFRAC(1)=1.
************************************************************
Group 4. Y-Direction Grid Spacing
NY = 30
YVLAST =0.1143
YFRAC(1)=0.022222 ;YFRAC(3)=0.066667
YFRAC(5)=0.111111 ;YFRAC(7)=0.155556
YFRAC(9)=0.2 ;YFRAC(11)=0.244444
YFRAC(13)=0.288889 ;YFRAC(15)=0.333333
YFRAC(17)=0.422222 ;YFRAC(19)=0.511111
YFRAC(21)=0.6 ;YFRAC(23)=0.688889
YFRAC(25)=0.777778 ;YFRAC(27)=0.866667
YFRAC(29)=0.955555
************************************************************
Group 5. Z-Direction Grid Spacing
PARAB = F
NZ = 30
ZWLAST =0.762
ZFRAC(1)=0.033333 ;ZFRAC(2)=0.066667
ZFRAC(3)=0.1 ;ZFRAC(4)=0.133333
ZFRAC(5)=0.166667 ;ZFRAC(6)=0.2
ZFRAC(7)=0.233333 ;ZFRAC(8)=0.266667
ZFRAC(9)=0.3 ;ZFRAC(10)=0.333333
ZFRAC(11)=0.366667 ;ZFRAC(12)=0.4
ZFRAC(13)=0.433333 ;ZFRAC(14)=0.466667
ZFRAC(15)=0.5 ;ZFRAC(16)=0.533333
ZFRAC(17)=0.566667 ;ZFRAC(18)=0.6
ZFRAC(19)=0.633333 ;ZFRAC(20)=0.666667
ZFRAC(21)=0.7 ;ZFRAC(22)=0.733333
ZFRAC(23)=0.766667 ;ZFRAC(24)=0.8
ZFRAC(25)=0.833333 ;ZFRAC(26)=0.866667
ZFRAC(27)=0.9 ;ZFRAC(28)=0.933333
ZFRAC(29)=0.966667 ;ZFRAC(30)=1.
************************************************************
Group 6. Body-Fitted Coordinates
************************************************************
Group 7. Variables: STOREd,SOLVEd,NAMEd
ONEPHS = F
EQUVEL = F
NAME(1)=P1 ;NAME(5)=CV1
NAME(6)=DV2 ;NAME(7)=SW1
NAME(8)=FW2 ;NAME(9)=AR1
NAME(10)=BR2 ;NAME(22)=MDOT
NAME(23)=LEN ;NAME(24)=VIS
NAME(149)=PRPS
* 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(CV1,Y,Y,N,N,N,Y)
SOLUTN(DV2,Y,Y,N,N,N,Y)
SOLUTN(SW1,Y,Y,N,N,N,Y)
SOLUTN(FW2,Y,Y,N,N,N,Y)
SOLUTN(AR1,Y,Y,N,N,N,Y)
SOLUTN(BR2,Y,Y,N,N,N,Y)
SOLUTN(MDOT,Y,N,N,N,N,N)
SOLUTN(LEN,Y,N,N,N,N,N)
SOLUTN(VIS,Y,N,N,N,N,N)
SOLUTN(PRPS,Y,N,N,N,N,N)
VIST = 24
INTMDT = 22
LEN1 = 23
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(CV1,Y,Y,Y,Y,Y,Y)
TERMS(DV2,Y,Y,Y,Y,N,Y)
TERMS(SW1,Y,Y,Y,Y,Y,Y)
TERMS(FW2,Y,Y,Y,Y,N,Y)
TERMS(AR1,Y,Y,Y,Y,Y,Y)
TERMS(BR2,Y,Y,Y,Y,N,Y)
DIFCUT =0.5 ;ZDIFAC =1.
GALA = F ;ADDDIF = F
NEWENT = T
EQDVDP = 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 = GRND9
TSURR =0. ;TEMP0 =0.
PRESS0 =0.
DVO1DT =0. ;DRH1DP =0.
EMISS =0. ;SCATT =0.
EL1A =0. ;EL1B =0.
EL1C =0.
RHO2 =1. ;TMP2 =0.
EL2 =0.
DVO2DT =0. ;DRH2DP =0.
ENUL =1.0E-06 ;ENUT = GRND4
ENUTA =1. ;ENUTB =0.
ENUTC =0.
IENUTA = 0
PHINT(CV1)=-2.022E+04 ;PHINT(DV2)=-2.022E+04
PHINT(SW1)=-2.022E+04 ;PHINT(FW2)=-2.022E+04
PHINT(AR1)=-2.022E+04 ;PHINT(BR2)=-2.022E+04
PRNDTL(CV1)=1. ;PRNDTL(DV2)=1.
PRNDTL(SW1)=1. ;PRNDTL(FW2)=1.
PRNDTL(AR1)=1. ;PRNDTL(BR2)=1.
PRT(CV1)=1. ;PRT(DV2)=1.
PRT(SW1)=1. ;PRT(FW2)=1.
PRT(AR1)=1. ;PRT(BR2)=1.
CP1 =1. ;CP2 =1.
************************************************************
Group 10.Inter-Phase Transfer Processes
CFIPS = GRND4
RLOLIM =0. ;CMDOT = GRND1
CFIPA =0. ;CFIPB =1.
CFIPC =0.05 ;CFIPD =-1.
CMDTA =10. ;CMDTB =0.5
CMDTC =0. ;CMDTD =0.
CINT(P1)=1. ;CINT(CV1)=1.
CINT(DV2)=1. ;CINT(SW1)=1.
CINT(FW2)=1. ;CINT(AR1)=1.
CINT(BR2)=1.
PHINT(P1)=-2.022E+04 ;PHINT(CV1)=-2.022E+04
PHINT(DV2)=-2.022E+04 ;PHINT(SW1)=-2.022E+04
PHINT(FW2)=-2.022E+04 ;PHINT(AR1)=-2.022E+04
PHINT(BR2)=-2.022E+04
************************************************************
Group 11.Initial field variables (PHIs)
FIINIT(P1)=1.0E-10 ;FIINIT(CV1)=1.0E-10
FIINIT(DV2)=1.0E-10 ;FIINIT(SW1)=18.200001
FIINIT(FW2)=18.200001 ;FIINIT(AR1)=0.5
FIINIT(BR2)=0.5 ;FIINIT(MDOT)=1.0E-10
FIINIT(LEN)=1.0E-10 ;FIINIT(VIS)=1.0E-10
FIINIT(PRPS)=-1.

PATCH(CMP0 ,INIVAL, 1, 1, 1, 15, 1, 6, 1, 1)
INIT(CMP0 ,PRPS,0. ,198. )
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, 16, 30, 1, 1, 1, 1)
COVAL(INLET ,CV1 ,0. ,0. )
COVAL(INLET ,DV2 ,0. ,0. )
COVAL(INLET ,SW1 ,0. ,18.200001 )
COVAL(INLET ,FW2 ,0. ,18.200001 )
COVAL(INLET ,AR1 , FIXFLU ,9.1 )
COVAL(INLET ,BR2 , FIXFLU ,9.1 )

PATCH(OUTLET ,HIGH , 1, 1, 1, 30, 30, 30, 1, 1)
COVAL(OUTLET ,CV1 ,0. ,0. )
COVAL(OUTLET ,DV2 ,0. ,0. )
COVAL(OUTLET ,SW1 ,0. ,0. )
COVAL(OUTLET ,FW2 ,0. ,0. )
COVAL(OUTLET ,AR1 ,1.0E+05 ,0. )
COVAL(OUTLET ,BR2 ,1.0E+05 ,0. )

PATCH(NORTHWAL,NWALL , 1, 1, 30, 30, 1, 30, 1, 1)
COVAL(NORTHWAL,SW1 ,1. ,0. )
COVAL(NORTHWAL,FW2 ,1. ,0. )

PATCH(SOUTHWAL,SWALL , 1, 1, 1, 1, 7, 30, 1, 1)
COVAL(SOUTHWAL,SW1 ,1. ,0. )
COVAL(SOUTHWAL,FW2 ,1. ,0. )

PATCH(SHSO ,CELL , 1, 1, 1, 30, 1, 30, 1, 1)
COVAL(SHSO ,CV1 , FIXFLU , GRND5 )
COVAL(SHSO ,DV2 , FIXFLU , GRND5 )
XCYCLE = F
EGWF = T
WALLCO = GRND2
************************************************************
Group 14. Downstream Pressure For PARAB
************************************************************
Group 15. Terminate Sweeps
LSWEEP = 100 ;ISWC1 = 1
LITHYD = 1 ;LITFLX = 1 ;LITC = 1 ;ITHC1 = 1
ISWR1 = 1 ;ISWR2 = 10000
SELREF = T
RESFAC =1.0E-04
************************************************************
Group 16. Terminate Iterations
LITER(P1)=20 ;LITER(CV1)=10
LITER(DV2)=10 ;LITER(SW1)=10
LITER(FW2)=10 ;LITER(AR1)=1
LITER(BR2)=1
ENDIT(P1)=1.0E-03 ;ENDIT(CV1)=1.0E-03
ENDIT(DV2)=1.0E-03 ;ENDIT(SW1)=1.0E-03
ENDIT(FW2)=1.0E-03 ;ENDIT(AR1)=1.0E-03
ENDIT(BR2)=1.0E-03
************************************************************
Group 17. Relaxation
RELAX(P1,LINRLX,1.)
RELAX(CV1,FALSDT,1.0E-04)
RELAX(DV2,FALSDT,1.0E-04)
RELAX(SW1,FALSDT,1.0E-03)
RELAX(FW2,FALSDT,1.0E-03)
RELAX(AR1,LINRLX,0.25)
RELAX(BR2,LINRLX,0.25)
RELAX(MDOT,LINRLX,0.5)
RELAX(LEN,LINRLX,1.)
RELAX(VIS,LINRLX,1.)
RELAX(PRPS,LINRLX,1.)
OVRRLX =0.
EXPERT = F ;NNORSL = F
************************************************************
Group 18. Limits
VARMAX(P1)=1.0E+10 ;VARMIN(P1)=-1.0E+10
VARMAX(CV1)=1.0E+06 ;VARMIN(CV1)=-1.0E+06
VARMAX(DV2)=1.0E+06 ;VARMIN(DV2)=-1.0E+06
VARMAX(SW1)=1.0E+06 ;VARMIN(SW1)=-1.0E+06
VARMAX(FW2)=1.0E+06 ;VARMIN(FW2)=-1.0E+06
VARMAX(AR1)=1. ;VARMIN(AR1)=1.0E-06
VARMAX(BR2)=1. ;VARMIN(BR2)=1.0E-06
VARMAX(MDOT)=1.0E+10 ;VARMIN(MDOT)=-1.0E+10
VARMAX(LEN)=1.0E+10 ;VARMIN(LEN)=-1.0E+10
VARMAX(VIS)=1.0E+10 ;VARMIN(VIS)=-1.0E+10
VARMAX(PRPS)=1.0E+10 ;VARMIN(PRPS)=-1.0E+10
************************************************************
Group 19. Data transmitted to GROUND
PARSOL = F
ISG62 = 1
SHSOA =1.
SPEDAT(SET,MATERIAL,198,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(CV1,Y,N,Y,Y,Y,Y)
OUTPUT(DV2,Y,N,Y,Y,Y,Y)
OUTPUT(SW1,Y,N,Y,Y,Y,Y)
OUTPUT(FW2,Y,N,Y,Y,Y,Y)
OUTPUT(AR1,N,N,N,N,N,N)
OUTPUT(BR2,Y,N,Y,Y,Y,Y)
OUTPUT(MDOT,Y,Y,Y,Y,Y,Y)
OUTPUT(LEN,N,N,Y,Y,N,N)
OUTPUT(VIS,N,N,Y,Y,N,N)
OUTPUT(PRPS,Y,N,Y,N,N,N)
************************************************************
Group 22. Monitor Print-Out
IXMON = 1 ;IYMON = 13 ;IZMON = 8
NPRMON = 100000 ;NPRMNT = 1 ;TSTSWP = 1
UWATCH = T ;USTEER = T
HIGHLO = F
************************************************************
Group 23.Field Print-Out & Plot Control
NPRINT = 100000 ;NUMCLS = 5
NYPRIN = 2 ;IYPRF = 1 ;IYPRL = 10000
NZPRIN = -1 ;IZPRF = 1 ;IZPRL = 10000
XZPR = F ;YZPR = F
IPLTF = 1 ;IPLTL = 1000 ;NPLT = 2
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(LPRO1 ,PROFIL, 1, 1, 1, 1, 6, 30, 1, 1)
PLOT(LPRO1 ,P1 ,0. ,0. )

PATCH(LPRO2 ,PROFIL, 1, 1, 30, 30, 6, 30, 1, 1)
PLOT(LPRO2 ,P1 ,0. ,0. )

PATCH(WPRO ,PROFIL, 1, 1, 1, 30, 8, 8, 1, 1)
PLOT(WPRO ,CV1 ,0.1 ,0.1 )
PLOT(WPRO ,DV2 ,0.1 ,0.1 )
PLOT(WPRO ,SW1 ,1. ,1. )
PLOT(WPRO ,FW2 ,1. ,1. )
************************************************************
Group 24. Dumps For Restarts
SAVE = T ;NOWIPE = F
NSAVE =CHAM
STOP
```