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*DECK BIVAF
SUBROUTINE BIVAF(KPSYS,IPTRK,IFTRAK,IMPX,NGEFF,NGIND,IDIR,NREG,
1 NUN,MAT,VOL,KEYFLX,FUNKNO,SUNKNO,TITR)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Solve N-group transport equation for fluxes using the diffusion
* approximation.
*
*Copyright:
* Copyright (C) 2004 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* KPSYS pointer to the assembly LCM object (L_PIJ signature). KPSYS is
* an array of directories.
* IPTRK pointer to the tracking (L_TRACK signature).
* IFTRAK not used.
* IMPX print flag (equal to zero for no print).
* NGEFF number of energy groups processed in parallel.
* NGIND energy group indices assign to the NGEFF set.
* IDIR not used.
* NREG total number of regions for which specific values of the
* neutron flux and reactions rates are required.
* NUN total number of unknowns in vectors SUNKNO and FUNKNO.
* MAT index-number of the mixture type assigned to each volume.
* VOL volumes.
* KEYFLX position of averaged flux elements in FUNKNO vector.
* SUNKNO input source vector.
* TITR title.
*
*Parameters: input/output
* FUNKNO unknown vector.
*
*-----------------------------------------------------------------------
*
USE GANLIB
*----
* SUBROUTINE ARGUMENTS
*----
CHARACTER TITR*72
TYPE(C_PTR) KPSYS(NGEFF),IPTRK
INTEGER NGEFF,NGIND(NGEFF),IFTRAK,IMPX,IDIR,NREG,NUN,
1 MAT(NREG),KEYFLX(NREG)
REAL VOL(NREG),FUNKNO(NUN,NGEFF),SUNKNO(NUN,NGEFF)
*----
* LOCAL VARIABLES
*----
PARAMETER (IUNOUT=6,NSTATE=40)
INTEGER IPAR(NSTATE)
LOGICAL CYLIND
*----
* ALLOCATABLE ARRAYS
*----
INTEGER, ALLOCATABLE, DIMENSION(:) :: MU,KN
REAL, ALLOCATABLE, DIMENSION(:) :: XX,YY,DD,QFR,BFR,SYS,T,TS,RH,
1 RT,IPERT
*----
* RECOVER BIVAC SPECIFIC PARAMETERS.
*----
IF(IMPX.GT.2) WRITE(IUNOUT,'(//8H BIVAF: ,A72)') TITR
IF(IDIR.NE.0) CALL XABORT('BIVAF: EXPECTING IDIR=0')
IF(IFTRAK.NE.0) CALL XABORT('BIVAF: EXPECTING IFTRAK=0')
CALL LCMGET(IPTRK,'STATE-VECTOR',IPAR)
IF(NREG.NE.IPAR(1)) CALL XABORT('BIVAF: INVALID VALUE OF NREG.')
IF(NUN.NE.IPAR(2)) CALL XABORT('BIVAF: INVALID VALUE OF NUN.')
ITYPE=IPAR(6)
CYLIND=(ITYPE.EQ.3).OR.(ITYPE.EQ.6)
IELEM=IPAR(8)
ICOL=IPAR(9)
ISPLH=IPAR(10)
LL4=IPAR(11)
LX=IPAR(12)
LY=IPAR(13)
NLF=IPAR(14)
ISPN=IPAR(15)
ISCAT=IPAR(16)
IF(NLF.GT.0) CALL XABORT('BIVAF: LIMITED TO DIFFUSION THEORY.')
IF(IDIR.NE.0) CALL XABORT('BIVAF: EXPECTING IDIR=0')
IF(IFTRAK.NE.0) CALL XABORT('BIVAF: EXPECTING IFTRAK=0')
*----
* RECOVER TRACKING INFORMATION.
*----
ALLOCATE(XX(LX*LY),YY(LX*LY),DD(LX*LY))
IF(ITYPE.EQ.8) THEN
CALL LCMGET(IPTRK,'SIDE',SIDE)
ELSE
CALL LCMGET(IPTRK,'XX',XX)
CALL LCMGET(IPTRK,'YY',YY)
CALL LCMGET(IPTRK,'DD',DD)
ENDIF
ALLOCATE(MU(LL4))
CALL LCMGET(IPTRK,'MU',MU)
CALL LCMLEN(IPTRK,'KN',MAXKN,ITYLCM)
CALL LCMLEN(IPTRK,'QFR',MAXQF,ITYLCM)
ALLOCATE(KN(MAXKN),QFR(MAXQF),BFR(MAXQF))
CALL LCMGET(IPTRK,'KN',KN)
CALL LCMGET(IPTRK,'QFR',QFR)
CALL LCMGET(IPTRK,'BFR',BFR)
IIMAX=MU(LL4)
ALLOCATE(SYS(IIMAX))
*----
* MAIN LOOP OVER ENERGY GROUPS.
*----
DO 40 II=1,NGEFF
IF(IMPX.GT.1) WRITE(IUNOUT,'(/24H BIVAF: PROCESSING GROUP,I5,
1 6H WITH ,A,1H.)') NGIND(II),'BIVAC/DIFFUSION'
*----
* COMPUTE THE NEUTRON FLUX
*----
CALL LCMGET(KPSYS(II),'IA001001',SYS)
IF((IELEM.LT.0).AND.(ITYPE.NE.8)) THEN
CALL LCMSIX(IPTRK,'BIVCOL',1)
CALL LCMLEN(IPTRK,'T',LC,ITYLCM)
ALLOCATE(T(LC),TS(LC))
CALL LCMGET(IPTRK,'T',T)
CALL LCMGET(IPTRK,'TS',TS)
CALL LCMSIX(IPTRK,' ',2)
CALL BIVS01(MAXKN,CYLIND,NREG,NUN,LL4,IIMAX,XX,DD,MAT,KN,BFR,
1 VOL,KEYFLX,MU,SUNKNO(1,II),LC,T,TS,SYS,FUNKNO(1,II))
DEALLOCATE(TS,T)
ELSE IF((IELEM.GT.0).AND.(ITYPE.NE.8)) THEN
CALL BIVS02(CYLIND,IELEM,ICOL,NREG,NUN,LL4,IIMAX,MAT,KN,BFR,
1 VOL,MU,SUNKNO(1,II),SYS,FUNKNO(1,II))
ELSE IF((IELEM.LT.0).AND.(ITYPE.EQ.8)) THEN
CALL LCMSIX(IPTRK,'BIVCOL',1)
ALLOCATE(RH(36),RT(9))
CALL LCMGET(IPTRK,'RH',RH)
CALL LCMGET(IPTRK,'RT',RT)
CALL LCMSIX(IPTRK,' ',2)
IF(ISPLH.EQ.1) THEN
NELEM=MAXKN/7
ELSE
NELEM=MAXKN/4
ENDIF
CALL BIVS03(MAXKN,MAXQF,NREG,NUN,LL4,ISPLH,NELEM,IIMAX,SIDE,
1 KN,QFR,BFR,VOL,KEYFLX,MU,SUNKNO(1,II),RH,RT,SYS,FUNKNO(1,II))
DEALLOCATE(RT,RH)
ELSE IF((IELEM.GT.0).AND.(ITYPE.EQ.8).AND.(ICOL.EQ.4)) THEN
CALL BIVS04(MAXKN,MAXQF,NREG,NUN,LL4,ISPLH,IIMAX,SIDE,KN,QFR,
1 BFR,VOL,KEYFLX,MU,SUNKNO(1,II),SYS,FUNKNO(1,II))
ELSE IF((IELEM.GT.0).AND.(ITYPE.EQ.8)) THEN
NBLOS=LX/3
ALLOCATE(IPERT(LX*ISPLH**2))
CALL LCMGET(IPTRK,'IPERT',IPERT)
CALL BIVS05(IELEM,NBLOS,NUN,LL4,IIMAX,IPERT,KN,BFR,MU,
1 SUNKNO(1,II),SYS,FUNKNO(1,II))
DEALLOCATE(IPERT)
ELSE
CALL XABORT('BIVAF: UNKNOWN TYPE OF GEOMETRY.')
ENDIF
*----
* END OF LOOP OVER ENERGY GROUPS.
*----
40 CONTINUE
DEALLOCATE(SYS,BFR,QFR,KN,MU,DD,YY,XX)
RETURN
END
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