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*DECK BIVS05
SUBROUTINE BIVS05(IELEM,NBLOS,NUN,LL4,IIMAX,IPERT,KN,BFR,MU,
1 SOURCE,SYS,FUNKNO)
*
*-----------------------------------------------------------------------
*
*Purpose:
* One-speed flux calculation in a Thomas-Raviart-Schneider (dual) finite
* element diffusion approximation (hexagonal geometry).
*
*Copyright:
* Copyright (C) 2006 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
* IELEM degree of the Lagrangian finite elements: =1 (linear);
* =2 (parabolic); =3 (cubic).
* NBLOS number of lozenges per direction, taking into account
* mesh-splitting.
* NUN dimension of array FUNKNO.
* LL4 number of unknowns per group in BIVAC.
* IIMAX allocated dimension of array SYS.
* IPERT mixture permutation index.
* KN element-ordered unknown list.
* BFR element-ordered surface fractions.
* MU indices used with 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 IELEM,NBLOS,NUN,LL4,IIMAX,IPERT(NBLOS),
1 KN(NBLOS,4+6*IELEM*(IELEM+1)),MU(LL4)
REAL BFR(NBLOS,6),SOURCE(LL4),SYS(IIMAX),FUNKNO(NUN)
*----
* RESOLUTION.
*----
DO 10 I=1,LL4
FUNKNO(I)=SOURCE(I)
10 CONTINUE
CALL ALLDLS (LL4,MU,SYS,FUNKNO)
*----
* CALCULATION OF THE SURFACE-AVERAGED FLUX.
*----
FUNKNO(NUN)=0.0
NUM=0
DO 100 KEL=1,NBLOS
IF(IPERT(KEL).EQ.0) GO TO 100
NUM=NUM+1
IF(BFR(NUM,1).GT.0.0) THEN
SG=1.0
DO 40 I0=1,IELEM
IND1=KN(NUM,1)+I0-1
FUNKNO(NUN)=FUNKNO(NUN)+SG*SQRT(REAL(2*I0-1))*FUNKNO(IND1)*
1 BFR(NUM,1)
SG=-SG
40 CONTINUE
ENDIF
IF(BFR(NUM,2).GT.0.0) THEN
DO 50 I0=1,IELEM
IND1=KN(NUM,2)+(I0-1)*IELEM
FUNKNO(NUN)=FUNKNO(NUN)+SQRT(REAL(2*I0-1))*FUNKNO(IND1)*
1 BFR(NUM,2)
50 CONTINUE
ENDIF
IF(BFR(NUM,3).GT.0.0) THEN
SG=1.0
DO 60 I0=1,IELEM
IND1=KN(NUM,2)+I0-1
FUNKNO(NUN)=FUNKNO(NUN)+SG*SQRT(REAL(2*I0-1))*FUNKNO(IND1)*
1 BFR(NUM,3)
SG=-SG
60 CONTINUE
ENDIF
IF(BFR(NUM,4).GT.0.0) THEN
DO 70 I0=1,IELEM
IND1=KN(NUM,3)+(I0-1)*IELEM
FUNKNO(NUN)=FUNKNO(NUN)+SQRT(REAL(2*I0-1))*FUNKNO(IND1)*
1 BFR(NUM,4)
70 CONTINUE
ENDIF
IF(BFR(NUM,5).GT.0.0) THEN
SG=1.0
DO 80 I0=1,IELEM
IND1=KN(NUM,3)+I0-1
FUNKNO(NUN)=FUNKNO(NUN)+SG*SQRT(REAL(2*I0-1))*FUNKNO(IND1)*
1 BFR(NUM,5)
SG=-SG
80 CONTINUE
ENDIF
IF(BFR(NUM,6).GT.0.0) THEN
DO 90 I0=1,IELEM
IND1=KN(NUM,4)+(I0-1)*IELEM
FUNKNO(NUN)=FUNKNO(NUN)+SQRT(REAL(2*I0-1))*FUNKNO(IND1)*
1 BFR(NUM,6)
90 CONTINUE
ENDIF
100 CONTINUE
RETURN
END
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