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*DECK TRIFLV
SUBROUTINE TRIFLV(KPSYS,INCONV,NGIND,IPTRK,IMPX,MAXIT,NGEFF,NREG,
1 NUN,KEYFLX,FUNKNO,SUNKNO)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Solve N-group transport equation for fluxes using the diffusion
* approximation or simplified PN method in TRIVAC.
*
*Copyright:
* Copyright (C) 2007 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
* KPSYS pointer to the assembly matrices. KPSYS is an array of
* directories.
* INCONV energy group convergence flag (set to .FALSE. if converged).
* NGIND energy group indices assign to the NGEFF set.
* IPTRK pointer to the tracking (L_TRACK signature).
* IMPX print flag (equal to zero for no print).
* NGEFF number of energy groups processed in parallel.
* NREG total number of regions for which specific values of the
* neutron flux and reactions rates are required.
* NUN total number of unknowns in vectors SUNKNO and FUNKNO.
* KEYFLX position of averaged flux elements in FUNKNO vector.
* SUNKNO input source vector.
*
*Parameters: input/output
* FUNKNO unknown vector.
*
*-----------------------------------------------------------------------
*
USE GANLIB
*----
* SUBROUTINE ARGUMENTS
*----
TYPE(C_PTR) KPSYS(NGEFF),IPTRK
INTEGER MAXIT,NGEFF,NGIND(NGEFF),IMPX,NREG,NUN,KEYFLX(NREG)
LOGICAL INCONV(NGEFF)
REAL FUNKNO(NUN,NGEFF),SUNKNO(NUN,NGEFF)
*----
* LOCAL VARIABLES
*----
PARAMETER (IUNOUT=6,NSTATE=40,EPSINR=1.0E-5,ICL1=3,ICL2=3)
DOUBLE PRECISION F1,F2,R1,R2,DMU
INTEGER IPAR(NSTATE)
CHARACTER NAMP*12
*----
* ALLOCATABLE ARRAYS
*----
REAL, ALLOCATABLE, DIMENSION(:) :: GAR,OLD1,OLD2
*----
* RECOVER TRIVAC SPECIFIC PARAMETERS.
*----
CALL LCMGET(IPTRK,'STATE-VECTOR',IPAR)
ITY=2
IELEM=ABS(IPAR(9))
LL4=IPAR(11)
ISPLH=IPAR(13)
LX=IPAR(14)
LZ=IPAR(16)
NLF=IPAR(30)
IF(IPAR(12).EQ.2) ITY=3
IF((NLF.GT.0).AND.(ITY.GE.3)) ITY=10+ITY
IF((ITY.EQ.11).OR.(ITY.EQ.13)) LL4=LL4*NLF/2
NADI=IPAR(33)
*----
* MAIN LOOP OVER ENERGY GROUPS.
*----
ALLOCATE(GAR(NUN),OLD1(NUN),OLD2(NUN))
GAR(:NUN)=0.0
OLD1(:NUN)=0.0
OLD2(:NUN)=0.0
DO 130 II=1,NGEFF
IF(.NOT.INCONV(II)) GO TO 130
IF(IMPX.GT.1) WRITE(IUNOUT,'(/25H TRIFLV: PROCESSING GROUP,I5,
1 6H WITH ,A,1H.)') NGIND(II),'TRIVAC'
*----
* SOLVE FOR THE FLUXES. USE EQUATION (C.24) IN IGE-281.
*----
NAMP='A001001'
OLD2(:NUN)=0.0
TEST=0.0
ITER=0
20 ITER=ITER+1
IF(ITER.GT.MAXIT) THEN
WRITE(IUNOUT,'(46H TRIFLV: MAXIMUM NUMBER OF ONE-SPEED ITERATION,
1 9H REACHED.)')
GO TO 130
ENDIF
DO 30 I=1,NUN
OLD1(I)=OLD2(I)
OLD2(I)=FUNKNO(I,II)
30 CONTINUE
CALL MTLDLM(NAMP,IPTRK,KPSYS(II),LL4,ITY,FUNKNO(1,II),GAR)
DO 40 I=1,NUN
GAR(I)=SUNKNO(I,II)-GAR(I)
40 CONTINUE
CALL FLDADI(NAMP,IPTRK,KPSYS(II),LL4,ITY,GAR,NADI)
DO 50 I=1,NUN
FUNKNO(I,II)=FUNKNO(I,II)+GAR(I)
50 CONTINUE
*----
* VARIATIONAL ACCELERATION.
*----
DMU=1.0D0
IF(MOD(ITER-1,ICL1+ICL2).GE.ICL1) THEN
F1=0.0D0
F2=0.0D0
DO 80 I=1,NUN
R1=OLD2(I)-OLD1(I)
R2=FUNKNO(I,II)-OLD2(I)
F1=F1+R1*(R2-R1)
F2=F2+(R2-R1)*(R2-R1)
80 CONTINUE
DMU=-F1/F2
IF(DMU.GT.0.0) THEN
DO 90 I=1,NUN
FUNKNO(I,II)=OLD2(I)+REAL(DMU)*(FUNKNO(I,II)-OLD2(I))
OLD2(I)=OLD1(I)+REAL(DMU)*(OLD2(I)-OLD1(I))
90 CONTINUE
ENDIF
ENDIF
*----
* CALCULATE ERROR AND TEST FOR CONVERGENCE.
*----
AAA=0.0
BBB=0.0
DO 100 I=1,NREG
IF(KEYFLX(I).EQ.0) GO TO 100
AAA=MAX(AAA,ABS(FUNKNO(KEYFLX(I),II)-OLD2(KEYFLX(I))))
BBB=MAX(BBB,ABS(FUNKNO(KEYFLX(I),II)))
100 CONTINUE
IF(IMPX.GT.2) WRITE(IUNOUT,300) ITER,AAA,BBB,DMU
IF(AAA.LE.EPSINR*BBB) GO TO 130
IF(ITER.EQ.1) TEST=AAA
IF((ITER.GE.10).AND.(AAA.GT.TEST)) THEN
WRITE(IUNOUT,'(43H TRIFLV: UNABLE TO CONVERGE ONE-SPEED ITERA,
1 6HTIONS.)')
GO TO 130
ENDIF
GO TO 20
*----
* END OF LOOP OVER ENERGY GROUPS
*----
130 CONTINUE
DEALLOCATE(OLD2,OLD1,GAR)
RETURN
*
300 FORMAT(28H TRIFLV: ONE-SPEED ITERATION,I3,8H ERROR=,1P,E11.4,
1 5H OVER,E11.4,22H ACCELERATION FACTOR=,0P,F7.3)
END
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