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*DECK KINT01
SUBROUTINE KINT01(MAXKN,SGD,CYLIND,NREG,LL4,NBMIX,XX,DD,MAT,KN,
1 VOL,LC,T,TS,F2,F3)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Multiplication of a matrix by a vector in primal finite element
* diffusion approximation (Cartesian geometry). Special version for
* Trivac.
*
*Copyright:
* Copyright (C) 2010 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.
* SGD mixture-ordered cross sections.
* CYLIND cylinderization flag (=.true. for cylindrical geometry).
* NREG number of elements in TRIVAC.
* LL4 order of matrix SYS.
* NBMIX number of macro-mixtures.
* XX X-directed mesh spacings.
* DD value used with a cylindrical geometry.
* MAT mixture index per region.
* KN element-ordered unknown list.
* VOL volume of regions.
* LC number of polynomials in a complete 1-D basis.
* T Cartesian linear product vector.
* TS cylindrical linear product vector.
* F2 vector to multiply.
*
*Parameters: output
* F3 result of the multiplication.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER MAXKN,NREG,LL4,NBMIX,MAT(NREG),KN(MAXKN),LC
REAL SGD(NBMIX),XX(NREG),DD(NREG),VOL(NREG),T(LC),TS(LC),F2(LL4),
1 F3(LL4)
LOGICAL CYLIND
*----
* LOCAL VARIABLES
*----
REAL R3DP(125),R3DC(125)
*----
* CALCULATION OF 3-D MASS MATRICES FROM TENSORIAL PRODUCT OF 1-D
* MATRICES
*----
LL=LC*LC*LC
DO 20 L=1,LL
L1=1+MOD(L-1,LC)
L2=1+(L-L1)/LC
L3=1+MOD(L2-1,LC)
I1=L1
I2=L3
I3=1+(L2-L3)/LC
R3DP(L)=T(I1)*T(I2)*T(I3)
R3DC(L)=TS(I1)*T(I2)*T(I3)
20 CONTINUE
*----
* MULTIPLICATION.
*----
NUM1=0
DO 90 K=1,NREG
L=MAT(K)
IF(L.EQ.0) GO TO 90
IF(VOL(K).EQ.0.0) GO TO 80
DX=XX(K)
DO 50 I=1,LL
IND1=KN(NUM1+I)
IF(IND1.EQ.0) GO TO 50
IF(CYLIND) THEN
RR=(R3DP(I)+R3DC(I)*DX/DD(K))
ELSE
RR=R3DP(I)
ENDIF
F3(IND1)=F3(IND1)+RR*SGD(L)*VOL(K)*F2(IND1)
50 CONTINUE
80 NUM1=NUM1+LL
90 CONTINUE
RETURN
END
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