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*DECK FLDTH1
SUBROUTINE FLDTH1 (ISPLH,NEL,LL4,EVECT,MAT,VOL,IDL,KN)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Compute the averaged flux for a linear primal formulation of
* the diffusion equation 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
* ISPLH type of triangular mesh-splitting (ISPLH.GT.1).
* NEL total number of finite elements.
* LL4 order of the system matrices.
* EVECT variational coefficients of the flux. The information is
* contained in position EVECT(1) to EVECT(LL4).
* MAT mixture index assigned to each element.
* VOL volume of each element
* IDL position of the average flux component associated with each
* volume.
* KN element-ordered unknown list.
*
*Parameters: output
* EVECT averaged fluxes. The information is contained in positions
* EVECT(LL4+1) to EVECT(LL4+NEL).
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER ISPLH,NEL,LL4,MAT(NEL),IDL(NEL),
1 KN(NEL*(18*(ISPLH-1)**2+8))
REAL EVECT(LL4+NEL),VOL(NEL)
*
IVAL=18*(ISPLH-1)**2+8
NUM1=0
SS=1.0/REAL(6*(ISPLH-1)**2)
DO 70 K=1,NEL
IF(MAT(K).EQ.0) GO TO 70
EVECT(IDL(K))=0.0
IF(VOL(K).EQ.0.0) GO TO 60
DO 50 I=1,6*(ISPLH-1)**2
IND1=KN(NUM1+I)
IF(IND1.EQ.0) GO TO 50
EVECT(IDL(K))=EVECT(IDL(K))+SS*EVECT(IND1)
50 CONTINUE
60 NUM1=NUM1+IVAL
70 CONTINUE
RETURN
END
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