#immersol) #declare IMMERSOL Emitting and absorbing gray media (1D tests; solving for H1) #cls TEXT(IMMERSOL 1D Radiative equilibrium :203 TITLE ************************************************************** PHOTON USE AUTOPLOT FILE PHI 5 CL;DA 1 TMP1;DA 1 T3;COL3 1;BLB4 2;REDR MSG Temperature and T3 profiles. ENDUSE ************************************************************** DISPLAY This problem is similar to that of case 202; but here solution for gas enthalpy replaces solution for temperature directly. ENDDIS #direct #temps MESG( ENTER optical thickness Kr*Wg (default 1.): READVDU(OPTHI,REAL,1.0) WSL1 = 0.01; WSL2= 0.01; WGAP= 1.0; *** CP111 is specific heat for 111; CP112 is for 112: CP111= 473.; CP112= 226.; HHOT= CP111*THOT; HCLD= CP112*TCLD QRAD= SIGMA*(THOT**4-TCLD**4) KROSS= OPTHI/WGAP; SCATT= 0.0; EMISS= KROSS-SCATT MESG( Expected radiative heat flux (W/m**2): QRAD = QRAD/(0.75*OPTHI + 1./EMISH + 1./EMISC - 1.) QRAD MESG( Expected gas temperatures near walls are: TGCL = ((SIGMA*TCLD**4 + QRAD*(1./EMISC-1.))/SIGMA)**0.25 TGHT = ((SIGMA*THOT**4 - QRAD*(1./EMISH-1.))/SIGMA)**0.25 TGCL TGHT SOLVE(H1); STORE(TMP1,PRPS,sph1,cp1) #geom1 #radflux TERMS(H1,N,N,Y,N,Y,N); INIADD= F; FIINIT(PRPS)= 0. FIINIT(TMP1) = 0.5*(THOT + TCLD) ! arithmetic mean FIINIT(H1)=FIINIT(TMP1) * 1000.0 ! temp * approx specific heat of air TMP1=LINH INIT(SOL1,PRPS,0.0,111.); INIT(SOL2,PRPS,0.0,112.) SPEDAT(SET,EMISSIVITY,111,R,:EMISH:) SPEDAT(SET,EMISSIVITY,112,R,:EMISC:) COVAL(HOT,H1,1.0,HHOT); COVAL(COLD,H1,1.0,HCLD) LSWEEP= 2000; VARMAX(T3)= 1.1*THOT IXMON=NX/2+1;IYMON=NY/2+1;IZMON=NZ/2+1; NXPRIN=1; NYPRIN=1; NZPRIN=1 RELAX(H1,LINRLX,1.0) RELAX(T3,LINRLX,1.0) OUTPUT(LTLS,Y,N,N,N,N,N); OUTPUT(WDIS,Y,N,N,N,N,N) OUTPUT(WGAP,Y,N,N,N,N,N) L($R193) CP1 = 1.005000E+03 FIINIT(CP1 ) = CP1 VARMAX(T3)=THOT ;VARMIN(T3)=TCLD VARMAX(TMP1)=THOT;VARMIN(TMP1)=TCLD fiinit(prps)=-1;prndtl(h1)=1.e10 isg21=10 ! minimum number of sweeps, needed for selref to work TSTSWP=-1 RESFAC=0.001 Activating the following In-Form statements (by moving them 2 spaces to the left) enables the coefficients in the equations for TEM1 and T3 to be inspected. inform7begin (stored var #3-1 is t3-tmp1) (stored var #rs1 is resi(h1)) (stored var #rs3 is resi(t3)) (stored var #ap1 is apco(h1)) (stored var #ap3 is apco(t3)) if(idir.eq.1) then (stored var #ae1 is aeco(h1)) (stored var #ae3 is aeco(t3)) endif if(idir.eq.2) then (stored var #an1 is anco(h1)) (stored var #an3 is anco(t3)) endif if(idir.eq.3) then (stored var #ah1 is ahco(h1)) (stored var #ah3 is ahco(t3)) endif inform7end