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+*DECK SYBJJ0
+ SUBROUTINE SYBJJ0 (IPAS,NSUPCE,NPIJ,NUNKNO,EPSJ,FUNKNO,SUNKNO,
+ 1 IMPX,ISTAT,NMC,PROCEL,PIJW,PISW,PSJW,PSSW)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Compute the neutron flux and interface currents in a do-it-yourself
+* geometry using the current iteration method.
+*
+*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
+* IPAS total number of regions.
+* NSUPCE number of cells.
+* NPIJ length of cellwise scattering-reduced collision probability
+* matrices.
+* EPSJ stopping criterion for flux-current iterations.
+* NUNKNO total number of unknowns in vectors SUNKNO and FUNKNO.
+* SUNKNO input source vector.
+* IMPX print flag (equal to 0 for no print).
+* ISTAT statistical approximation flag (set with ISTAT=1).
+* NMC offset of the first volume in each cell.
+* PROCEL user supplied geometrical matrix.
+* PIJW cellwise scattering-reduced collision probability matrices.
+* PISW cellwise scattering-reduced escape probability matrices.
+* PSJW cellwise scattering-reduced collision probability matrices
+* for incoming neutrons.
+* PSSW cellwise scattering-reduced transmission probability matrices.
+*
+*Parameters: input/output
+* FUNKNO unknown vector.
+*
+*-----------------------------------------------------------------------
+*
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+*----
+* SUBROUTINE ARGUMENTS
+*----
+ INTEGER IPAS,NSUPCE,NPIJ,NUNKNO,IMPX,ISTAT,NMC(NSUPCE+1)
+ REAL EPSJ,FUNKNO(NUNKNO),SUNKNO(NUNKNO),PROCEL(NSUPCE,NSUPCE),
+ 1 PIJW(NPIJ),PISW(IPAS),PSJW(IPAS),PSSW(NSUPCE)
+*----
+* LOCAL VARIABLES
+*----
+ REAL PIJ
+ LOGICAL LOGTES
+ PARAMETER (MAXIT=400,LACCFC=2,ICL1=3,ICL2=3)
+*----
+* ALLOCATABLE ARRAYS
+*----
+ INTEGER, DIMENSION(:), POINTER :: INDPIJ
+ DOUBLE PRECISION, DIMENSION(:), POINTER :: CIT0
+ DOUBLE PRECISION, DIMENSION(:,:), POINTER :: CITR,AITR
+ DOUBLE PRECISION, DIMENSION(:), POINTER :: WCURR
+*----
+* SCRATCH STORAGE ALLOCATION
+*----
+ ALLOCATE(INDPIJ(NSUPCE))
+ ALLOCATE(CITR(3,NSUPCE),CIT0(NSUPCE),AITR(2,NSUPCE))
+ ALLOCATE(WCURR(NSUPCE))
+*
+ IPIJ=0
+ DO 10 JKG=1,NSUPCE
+ J2=NMC(JKG+1)-NMC(JKG)
+ INDPIJ(JKG)=IPIJ
+ IPIJ=IPIJ+J2*J2
+ 10 CONTINUE
+*----
+* PROCESS STATISTICAL APPROXIMATION
+*----
+ IF(ISTAT.NE.0) THEN
+ X1=0.0D0
+ DO 20 IKK=1,NSUPCE
+ X1=X1+PSSW(IKK)*PROCEL(1,IKK)
+ 20 CONTINUE
+ X1=1.0D0/(1.0D0-X1)
+ SSS=0.0D0
+ DO 35 IKK=1,NSUPCE
+ I1P=NMC(IKK)
+ I2=NMC(IKK+1)-I1P
+ DO 30 I=1,I2
+ SSS=SSS+PROCEL(1,IKK)*X1*PSJW(I1P+I)*SUNKNO(I1P+I)
+ 30 CONTINUE
+ 35 CONTINUE
+ IT3=1
+ DO 40 IKK=1,NSUPCE
+ CITR(IT3,IKK)=SSS
+ 40 CONTINUE
+ GO TO 190
+ ENDIF
+*----
+* COMPUTE PSJW * Q(*) CONTRIBUTION
+*----
+ DO 52 IKK=1,NSUPCE
+ CIT0(IKK)=0.0D0
+ CITR(1,IKK)=FUNKNO(IPAS+IKK)
+ DO 51 JKK=1,NSUPCE
+ I1P=NMC(JKK)
+ I2=NMC(JKK+1)-I1P
+ DO 50 I=1,I2
+ CIT0(IKK)=CIT0(IKK)+PROCEL(IKK,JKK)*PSJW(I1P+I)*SUNKNO(I1P+I)
+ 50 CONTINUE
+ 51 CONTINUE
+ 52 CONTINUE
+*----
+* COMPUTE NORMALIZATION VECTOR WCURR
+*----
+ DO 65 JKK=1,NSUPCE
+ WCURR(JKK)=1.0D0
+ DO 60 IKK=1,NSUPCE
+ WCURR(JKK)=WCURR(JKK)-PROCEL(IKK,JKK)*PSSW(JKK)
+ 60 CONTINUE
+ 65 CONTINUE
+*
+ ISTART=1
+ TEST=0.0D0
+ ITER=0
+ 70 ITER=ITER+1
+ IF(ITER.GT.MAXIT) THEN
+ WRITE(6,'(/47H SYBJJ0: *** WARNING *** MAXIMUM NUMBER OF ITER,
+ 1 15HATIONS REACHED.)')
+ GO TO 190
+ ENDIF
+ IT3=MOD(ITER,3)+1
+ IT2=MOD(ITER-1,3)+1
+ IT1=MOD(ITER-2,3)+1
+ DO 80 I=1,NSUPCE
+ CITR(IT3,I)=CIT0(I)
+ 80 CONTINUE
+*----
+* COMPUTE PSSW * J(-) CONTRIBUTION
+*----
+ DO 95 IKK=1,NSUPCE
+ DO 90 JKK=1,NSUPCE
+ PSS=PROCEL(IKK,JKK)*PSSW(JKK)
+ CITR(IT3,IKK)=CITR(IT3,IKK)+PSS*CITR(IT2,JKK)
+ 90 CONTINUE
+ 95 CONTINUE
+*----
+* NORMALIZATION
+*----
+ S1=0.0D0
+ S2=0.0D0
+ DO 100 I=1,NSUPCE
+ S1=S1+WCURR(I)*CITR(IT3,I)
+ S2=S2+CIT0(I)
+ 100 CONTINUE
+ ZNORM=S2/S1
+ IF(ZNORM.LT.0.0D0) ZNORM=1.0D0
+ DO 110 I=1,NSUPCE
+ CITR(IT3,I)=CITR(IT3,I)*ZNORM
+ 110 CONTINUE
+*----
+* ONE/TWO PARAMETER ACCELERATION
+*----
+ ALP=1.0D0
+ BET=0.0D0
+ LOGTES=(1+MOD(ITER-ISTART,ICL1+ICL2).GT.ICL1)
+ IF(LOGTES) THEN
+ DO 135 IKK=1,NSUPCE
+ AITR(1,IKK)=CITR(IT3,IKK)-CITR(IT2,IKK)
+ AITR(2,IKK)=CITR(IT2,IKK)-CITR(IT1,IKK)
+ DO 130 JKK=1,NSUPCE
+ PSS=PROCEL(IKK,JKK)*PSSW(JKK)
+ AITR(1,IKK)=AITR(1,IKK)-PSS*(CITR(IT3,JKK)-CITR(IT2,JKK))
+ AITR(2,IKK)=AITR(2,IKK)-PSS*(CITR(IT2,JKK)-CITR(IT1,JKK))
+ 130 CONTINUE
+ 135 CONTINUE
+ IF((LACCFC.EQ.1).OR.(MOD(ITER-ISTART,ICL1+ICL2).EQ.ICL1)) THEN
+ S1=0.0D0
+ S2=0.0D0
+ DO 140 I=1,NSUPCE
+ S1=S1+(CITR(IT3,I)-CITR(IT2,I))*AITR(1,I)
+ S2=S2+AITR(1,I)*AITR(1,I)
+ 140 CONTINUE
+ IF(S2.EQ.0.0D0) THEN
+ ISTART=ITER+1
+ ELSE
+ ALP=S1/S2
+ IF(ALP.LE.0.0D0) THEN
+ ISTART=ITER+1
+ ALP=1.0D0
+ ENDIF
+ ENDIF
+ DO 150 I=1,NSUPCE
+ CITR(IT3,I)=CITR(IT2,I)+ALP*(CITR(IT3,I)-CITR(IT2,I))
+ 150 CONTINUE
+ ELSE IF(LACCFC.EQ.2) THEN
+ S1=0.0D0
+ S2=0.0D0
+ S3=0.0D0
+ S4=0.0D0
+ S5=0.0D0
+ DO 160 I=1,NSUPCE
+ S1=S1+(CITR(IT3,I)-CITR(IT2,I))*AITR(1,I)
+ S2=S2+AITR(1,I)*AITR(1,I)
+ S3=S3+(CITR(IT3,I)-CITR(IT2,I))*AITR(2,I)
+ S4=S4+AITR(1,I)*AITR(2,I)
+ S5=S5+AITR(2,I)*AITR(2,I)
+ 160 CONTINUE
+ DET=S2*S5-S4*S4
+ IF(DET.EQ.0.0D0) THEN
+ ISTART=ITER+1
+ ELSE
+ ALP=(S5*S1-S4*S3)/DET
+ BET=(S2*S3-S4*S1)/DET
+ IF(ALP.LE.0.0D0) THEN
+ ISTART=ITER+1
+ ALP=1.0D0
+ BET=0.0D0
+ ENDIF
+ ENDIF
+ DO 170 I=1,NSUPCE
+ CITR(IT3,I)=CITR(IT2,I)+ALP*(CITR(IT3,I)-CITR(IT2,I))+
+ 1 BET*(CITR(IT2,I)-CITR(IT1,I))
+ 170 CONTINUE
+ ENDIF
+ ENDIF
+*----
+* CHECK THE CONVERGENCE ERROR
+*----
+ ERR1=0.0D0
+ ERR2=0.0D0
+ DO 180 I=1,NSUPCE
+ ERR1=MAX(ERR1,ABS(CITR(IT3,I)-CITR(IT2,I)))
+ ERR2=MAX(ERR2,ABS(CITR(IT3,I)))
+ 180 CONTINUE
+ IF(IMPX.GT.3) WRITE(6,'(30H SYBJJ0: CURRENT ITERATION NB.,I4,
+ 1 7H ERROR=,1P,E10.3,5H OVER,E10.3,15H NORMALIZATION=,E10.3,
+ 2 14H ACCELERATION=,2E11.3,1H.)') ITER,ERR1,ERR2,ZNORM,ALP,
+ 3 BET/ALP
+ IF(ITER.EQ.1) TEST=ERR1/ERR2
+ IF((ITER.GT.20).AND.(ERR1/ERR2.GT.TEST)) CALL XABORT('SYBJJ0: '
+ 1 //'CONVERGENCE FAILURE.')
+ IF(LOGTES.OR.(ERR1.GT.EPSJ*ERR2)) GO TO 70
+ IF(IMPX.GT.2) WRITE(6,'(37H SYBJJ0: CURRENT CONVERGENCE AT ITERA,
+ 1 8HTION NB.,I4,7H ERROR=,1P,E10.3,5H OVER,E10.3,1H.)') ITER,ERR1,
+ 2 ERR2
+*
+ 190 DO 200 I=1,IPAS
+ FUNKNO(I)=0.0
+ 200 CONTINUE
+ DO 210 I=1,NSUPCE
+ FUNKNO(IPAS+I)=REAL(CITR(IT3,I))
+ 210 CONTINUE
+*----
+* COMPUTE ( PISW * J(-) ) + ( PIJW * Q(*) ) CONTRIBUTION
+*----
+ DO 240 IKK=1,NSUPCE
+ I1P=NMC(IKK)
+ I2=NMC(IKK+1)-I1P
+ DO 230 J=1,I2
+ FUNKNO(I1P+J)=FUNKNO(I1P+J)+PISW(I1P+J)*FUNKNO(IPAS+IKK)
+ DO 220 I=1,I2
+ PIJ=PIJW(INDPIJ(IKK)+(I-1)*I2+J)
+ FUNKNO(I1P+J)=FUNKNO(I1P+J)+PIJ*SUNKNO(I1P+I)
+ 220 CONTINUE
+ 230 CONTINUE
+ 240 CONTINUE
+*----
+* SCRATCH STORAGE DEALLOCATION
+*----
+ DEALLOCATE(WCURR)
+ DEALLOCATE(AITR,CIT0,CITR)
+ DEALLOCATE(INDPIJ)
+ RETURN
+ END
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