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*DECK BIVS04
SUBROUTINE BIVS04(MAXKN,MAXQF,NREG,NUN,LL4,ISPLH,IIMAX,SIDE,KN,
1 QFR,BFR,VOL,IDL,MU,SOURCE,SYS,FUNKNO)
*
*-----------------------------------------------------------------------
*
*Purpose:
* One-speed flux calculation in mixed-dual finite element approximation
* (hexagonal geometry).
*
*Copyright:
* Copyright (C) 2002 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
* MAXKN dimension of array KN.
* MAXQF dimension of arrays QFR and BFR.
* NREG number of hexagons in BIVAC.
* NUN dimension of array FUNKNO.
* LL4 number of unknowns per group in BIVAC. Equal to the number
* of finite elements (hexagons or triangles) excluding the
* virtual elements.
* ISPLH type of hexagonal mesh-splitting:
* =1: hexagonal elements; >1: triangular elements.
* IIMAX allocated dimension of array SYS.
* SIDE side of the hexagons.
* KN element-ordered unknown list.
* QFR element-ordered information.
* BFR element-ordered surface fractions.
* VOL volume of hexagons.
* IDL position of the average flux component associated with
* each volume.
* MU indices used with the compressed diagonal storage mode matrix
* SYS.
* SOURCE fission and diffusion sources.
* SYS factorized system matrix.
*
*Parameters: output
* FUNKNO neutron fluxes (surface-averaged flux are in position
* FUNKNO(NUN)).
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER MAXKN,MAXQF,NREG,NUN,LL4,ISPLH,IIMAX,KN(MAXKN),IDL(NREG),
1 MU(LL4)
REAL SIDE,QFR(MAXQF),BFR(MAXQF),VOL(NREG),SOURCE(LL4),SYS(IIMAX),
1 FUNKNO(NUN)
*
IF(ISPLH.EQ.1) THEN
DS=SQRT(3.0)*SIDE
FACT=2.0/(3.0*DS)
NSURF=6
ELSE
DS=SIDE/(SQRT(3.0)*REAL(ISPLH-1))
FACT=4.0/(3.0*DS)
NSURF=3
ENDIF
*----
* RESOLUTION.
*----
DO 10 I=1,LL4
FUNKNO(I)=SOURCE(I)
10 CONTINUE
CALL ALLDLS (LL4,MU,SYS,FUNKNO)
*----
* CALCULATION OF ELEMENT-AVERAGED FLUXES.
*----
IF(ISPLH.GT.1) THEN
NSURF=3
DO 20 K=1,NREG
IF(IDL(K).NE.0) FUNKNO(IDL(K))=0.0
20 CONTINUE
NUM1=0
DO 40 IND1=1,LL4
K=KN(NUM1+NSURF+1)
IF(VOL(K).EQ.0.0) GO TO 30
FUNKNO(IDL(K))=FUNKNO(IDL(K))+QFR(NUM1+NSURF+1)*FUNKNO(IND1)/
1 VOL(K)
30 NUM1=NUM1+NSURF+1
40 CONTINUE
ELSE
NSURF=6
ENDIF
*----
* CALCULATION OF SURFACE-AVERAGED FLUX.
*----
FUNKNO(NUN)=0.0
NUM1=0
DO 70 IND1=1,LL4
K=KN(NUM1+NSURF+1)
IF(VOL(K).EQ.0.0) GO TO 60
DO 50 IC=1,NSURF
IF(BFR(NUM1+IC).GT.0.0) THEN
FUNKNO(NUN)=FUNKNO(NUN)+FUNKNO(IND1)*BFR(NUM1+IC)
ENDIF
50 CONTINUE
60 NUM1=NUM1+NSURF+1
70 CONTINUE
RETURN
END
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