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*DECK MCGFCS
SUBROUTINE MCGFCS(N,NDIM,NZON,QN,FI,M,NANI,NLIN,NFUNL,SC,S,KPN,
1 NREG,IPRINT,KEYFLX,KEYCUR,IBC,SIGAL,STIS)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Calculation of source for collision at iteration iter.
*
*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): I. Suslov and R. Le Tellier
*
*Parameters: input
* N number of spatial unknowns.
* NDIM number of dimensions for the geometry.
* NZON index-number of the mixture type assigned to each volume.
* QN input source (fission-other groups) vector.
* FI unknown vector.
* M number of material mixtures.
* NANI scattering anisotropy (=1 for isotropic scattering).
* NLIN linear discontinuous flag (=1 SC/DD0; =3 LDC/DD1).
* NFUNL number of spherical harmonics components.
* SC macroscopic scattering cross section.
* KPN total number of unknowns in vectors QN and FI.
* NREG number of volumes.
* IPRINT print parameter (equal to zero for no print).
* KEYFLX position of flux elements in FI vector.
* KEYCUR position of current elements in FI.
* IBC index for boundary condition to connect a surface to another.
* STIS integration strategy flag.
* SIGAL total cross-section and albedo array.
*
*Parameters: output
* S source elements vector.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER N,NDIM,NZON(N),M,NANI,NLIN,NFUNL,KPN,NREG,IPRINT,
1 KEYFLX(NREG,NLIN,NFUNL),KEYCUR(N-NREG),IBC(N-NREG),STIS
REAL QN(KPN),FI(KPN),SC(0:M,NANI),SIGAL(-6:M)
DOUBLE PRECISION S(KPN)
*
IF(NDIM.EQ.2) THEN
* 2D geometry
DO IR=1,N
IBM=NZON(IR)
IF(IBM.LT.0) THEN
* Boundary condition
ISUR=IR-NREG
ISUR2=IBC(ISUR)
IND=KEYCUR(ISUR)
IND2=KEYCUR(ISUR2)
IF(IND.GT.0) S(IND)=SIGAL(IBM)*FI(IND2)
ELSEIF(IBM.GE.0) THEN
* Volume cell
DO IL=0,NANI-1
XSC=REAL(2*IL+1)*SC(IBM,IL+1)
DO IM=0,IL
DO IE=1,NLIN
IND=KEYFLX(IR,IE,1+IL*(IL+1)/2+IM)
IF(IND.GT.0) THEN
S(IND)=QN(IND)+XSC*FI(IND)
IF(STIS.EQ.-1) S(IND)=S(IND)/SIGAL(IBM)
ENDIF
ENDDO
ENDDO
ENDDO
ENDIF
ENDDO
ELSE ! NDIM.EQ.3
* 3D geometry
DO IR=1,N
IBM=NZON(IR)
IF(IBM.LT.0) THEN
* Boundary condition
ISUR=IR-NREG
ISUR2=IBC(ISUR)
IND=KEYCUR(ISUR)
IND2=KEYCUR(ISUR2)
IF(IND.GT.0) S(IND)=SIGAL(IBM)*FI(IND2)
ELSEIF(IBM.GE.0) THEN
* Volume cell
INDA=0
DO IL=0,NANI-1
XSC=REAL(2*IL+1)*SC(IBM,IL+1)
DO IM=-IL,IL
DO IE=1,NLIN
INDA=INDA+1
IND=KEYFLX(IR,IE,INDA)
IF(IND.GT.0) THEN
S(IND)=QN(IND)+XSC*FI(IND)
IF(STIS.EQ.-1) S(IND)=S(IND)/SIGAL(IBM)
ENDIF
ENDDO
ENDDO
ENDDO
ENDIF
ENDDO
ENDIF
*
IF(IPRINT.GT.6) CALL PRINDM ('S ',S,KPN)
RETURN
END
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