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*DECK FLDBH1
SUBROUTINE FLDBH1 (NEL,NUN,LL4,EVECT,VOL,IDL,KN,QFR)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Calculation of the averaged flux with a mesh centered finite
* difference method in hexagonal geometry with triangular
* mesh-splitting.
*
*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
* NEL number of hexagons.
* NUN number of unknowns per energy group.
* LL4 order of the system matrices.
* EVECT variational coefficients of the flux. The information is
* contained in position EVECT(1) to EVECT(LL4).
* VOL volume of each element.
* IDL position of the average flux component associated with each
* volume.
* KN element-ordered unknown list.
* QFR element-ordered information.
*
*Parameters: output
* EVECT averaged fluxes. The information is contained in positions
* EVECT(IDL(I)).
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NEL,NUN,LL4,IDL(NEL),KN(4*LL4)
REAL EVECT(NUN),VOL(NEL),QFR(4*LL4)
*
NSURF=3
DO 10 K=1,NEL
IF(IDL(K).NE.0) EVECT(IDL(K))=0.0
10 CONTINUE
NUM1=0
DO 20 IND1=1,LL4
K=KN(NUM1+NSURF+1)
EVECT(IDL(K))=EVECT(IDL(K))+QFR(NUM1+NSURF+1)*EVECT(IND1)/VOL(K)
NUM1=NUM1+NSURF+1
20 CONTINUE
RETURN
END
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