PHOTON USE
  p
  phi
  1 20 1
 
 
  msg grid (scale enlarged 20 times in y direction)
  gr z 1
  msg Press  to continue
  pause;  cl
  msg 1st-phase (vapour) velocity vectors
  vec z 1 sh;  gr ou z 1
  msg Press  to continue
  pause ;  cl
  msg 2nd-phase (water) velocity vectors
  set vec comp;  au2 bv2 -;  vec z 1 sh;  gr ou z 1
  msg Press  to continue
  pause;  cl
  msg contours of pressure
  con p1 z 1 fi;0.1;  gr ou z 1
  msg Press  to continue
  pause;  cl
  msg contours of 1st-phase (vapour) volume fraction
  con gas z 1 fi;0.1;  gr ou z 1
  msg Press  to continue
  pause ;  cl
  msg contours of 2nd-phase (water) enthalpy
  con iliq z 1 fi;0.1;  gr ou z 1
  msg Press e to END
  enduse
 
    GROUP 1. Run title
TEXT(BOILING , NO GRAVITY :              W897
TITLE
  DISPLAY
   NUMERICAL BENCHMARK PROBLEM 3.2: BOILING IN A CHANNEL
   Saturated water enters a duct of uniform rectangular
   cross-section. The first quarter of its length is
   unheated; but heat is supplied to the remainder of the
   pipe at a fixed rate, causing boiling, and a consequent
   acceleration of both liquid and vapour.
 
   Three cases are considered. In the first, the influence
   of gravity is totally neglected. In the second, the duct
   is vertical, with flow from bottom to top, and the effect
   of gravity is accounted for. In the third, the pipe is
   horizontal, and the effect of gravity is again taken into
   account.
 
   The task is to predict the distributions of steam and water
   velocities and enthalpies, of pressure, and of volume
   fraction, along the pipe. Special interest attaches to
   comparisons between the three cases.
  ENDDIS
REAL(CHATIM,REFMAS,VELCTY,HEAT,XLEN,SIDE,AREA)
VELCTY=0.01;HEAT=1.E5;XLEN=1.0;SIDE=0.01;AREA=SIDE*SIDE
    GROUP 3. X-direction grid specification
GRDPWR(X,20,XLEN,1.0)
    GROUP 4. Y-direction grid specification
GRDPWR(Y,10,SIDE,1.0);ZWLAST=SIDE
    GROUP 7. Variables stored, solved & named
ONEPHS=F;SOLVE(P1,U1,U2,V1,V2,H1,H2,R1,R2)
NAME(R1)=GAS;NAME(R2)=LIQ;NAME(U2)=AU2;NAME(H2)=ILIQ;NAME(V2)=BV2
  ** Provide storage for inter-phase mass transfer
STORE(MDOT)
    GROUP 8. Terms (in differential equations) & devices
  ** Cut off built-in sources
TERMS(H1,N,Y,Y,Y,Y,Y);TERMS(ILIQ,N,P,P,P,P,P)
    GROUP 9. Properties of the medium (or media)
RHO2=1.E3;ENUL=1.E-3
    GROUP 10. Inter-phase-transfer processes and properties
  ** Set constant inter-phase friction factor and activate
     the calculation of the inter-phase mass transfer by
     means of a heat balance between the two phases.
     Note that the minus sign is merely a signal to use the
     second-phase density.
CFIPS=-5.E1;CMDOT=HEATBL
  ** Set the inter-phase heat transfer coefficients
CINT(H1)=1.E-2;CINT(ILIQ)=1.E0
  ** Set the values of the enthalpies at the interface
PHINT(H1)=2.5E6;PHINT(ILIQ)=4.0E5
    GROUP 11. Initialization of variable or porosity fields
FIINIT(GAS)=1.E-2;FIINIT(LIQ)=0.99
FIINIT(H1)=2.5E6;FIINIT(ILIQ)=4.0E5
FIINIT(U1)=VELCTY;FIINIT(AU2)=VELCTY;FIINIT(MDOT)=0.0
    GROUP 13. Boundary conditions and special sources
  ** Inlet at low-x (west) end
INLET(INLET,WEST,1,1,1,NY,1,1,1,1)
VALUE(INLET,P2,VELCTY*RHO2);VALUE(INLET,AU2,VELCTY)
VALUE(INLET,ILIQ,4.0E5)
  ** Outlet at high-x (east)
PATCH(OUTLET,CELL,NX,NX,1,NY,1,1,1,1)
COVAL(OUTLET,P1,1.0,0.0);COVAL(OUTLET,P2,1.0*RHO2,0.0)
COVAL(OUTLET,U1,ONLYMS,0.0);COVAL(OUTLET,AU2,ONLYMS,0.0)
COVAL(OUTLET,V1,ONLYMS,0.0);COVAL(OUTLET,BV2,ONLYMS,0.0)
COVAL(OUTLET,H1,ONLYMS,SAME);COVAL(OUTLET,ILIQ,ONLYMS,SAME)
  ** Heated walls
PATCH(NORTH1,PHASEM,NX/4+1,NX,NY,NY,1,1,1,1)
COVAL(NORTH1,ILIQ,FIXFLU,HEAT)
PATCH(SOUTH1,PHASEM,NX/4+1,NX,1,1,1,1,1,1)
COVAL(SOUTH1,ILIQ,FIXFLU,HEAT)
  ** Friction at walls
PATCH(NORTH2,NORTH,1,NX,NY,NY,1,1,1,1)
COVAL(NORTH2,U1,-0.002,0.0);COVAL(NORTH2,AU2,-0.002,0.0)
PATCH(SOUTH2,SOUTH,1,NX,1,1,1,1,1,1)
COVAL(SOUTH2,U1,-0.002,0.0);COVAL(SOUTH2,AU2,-0.002,0.0)
    GROUP 15. Termination of sweeps
LSWEEP=500
    GROUP 16. Termination of iterations
REFMAS=RHO2*VELCTY*AREA;RESREF(P1)=1.E-7*VELCTY*AREA
RESREF(GAS)=1.E-7*REFMAS;RESREF(LIQ)=1.E-7*REFMAS
RESREF(U1)=RESREF(GAS)*VELCTY
RESREF(AU2)=RESREF(LIQ)*VELCTY
RESREF(V1)=RESREF(GAS)*VELCTY
RESREF(BV2)=RESREF(LIQ)*VELCTY
RESREF(H1)=RESREF(GAS)*PHINT(H1)
RESREF(ILIQ)=RESREF(LIQ)*PHINT(ILIQ)
LITER(U1)=20;LITER(V1)=1;LITER(AU2)=20;LITER(BV2)=1
LITER(LIQ)=1;LITER(GAS)=1
    GROUP 17. Under-relaxation devices
CHATIM=0.01*XLEN/VELCTY
RELAX(U1,FALSDT,CHATIM);RELAX(AU2,FALSDT,0.1*CHATIM)
RELAX(V1,FALSDT,0.001*CHATIM);RELAX(BV2,FALSDT,0.001*CHATIM)
RELAX(H1,FALSDT,CHATIM);RELAX(ILIQ,FALSDT,0.1*CHATIM)
RELAX(GAS,LINRLX,0.35);RELAX(LIQ,LINRLX,0.35)
    GROUP 19. Data communicated by satellite to GROUND
    GROUP 20. Preliminary print-out
    GROUP 22. Spot-value print-out
TSTSWP=-1;IXMON=NX/2;IYMON=NY/2
    GROUP 23. Field print-out and plot control
IPLTF=3;IPLTL=LSWEEP;NPLT=1;NXPRIN=NX/5;NYPRIN=NY/5;ORSIZ=0.4
PATCH(LONGPLOT,PROFIL,1,NX,1,1,1,1,1,1)
PLOT(LONGPLOT,P1,0.0,0.0)
PLOT(LONGPLOT,LIQ,0.0,0.0);PLOT(LONGPLOT,U1,-1.0,-1.0)
PLOT(LONGPLOT,AU2,-1.0,-1.0);PLOT(LONGPLOT,MDOT,0.0,0.0)
PATCH(MAP,CONTUR,1,NX,1,NY,1,1,1,1)
PLOT(MAP,P1,0.0,10.0);PLOT(MAP,U1,0.0,10.0)
PLOT(MAP,AU2,0.0,10.0);PLOT(MAP,GAS,0.0,10.0)
PLOT(MAP,LIQ,0.0,10.0);PLOT(MAP,ILIQ,0.0,10.0)
    GROUP 24. Dumps for restarts