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*DECK NSS2AC
SUBROUTINE NSS2AC(NG,NUN,IG0,FLUX,ZMU)
*
*-----------------------------------------------------------------------
*
*Purpose:
* One-factor variationnal acceleration of the flux. Double precision
* version.
*
*Copyright:
* Copyright (C) 2023 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): R. Roy
*
*Parameters: input
* NG number of energy groups.
* NUN number of unknowns per energy group.
* IG0 first group to accelerate.
*
*Parameters: input/output
* FLUX neutron flux:
* FLUX(:,:,1) <=old;
* FLUX(:,:,2) <=present;
* FLUX(:,:,3) <=new.
*
*Parameters: output
* ZMU acceleration factor.
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER :: NG, NUN, IG0
REAL(KIND=8) :: FLUX(NUN,NG,3), ZMU
*----
* LOCAL VARIABLES
*----
INTEGER IG, IR
REAL(KIND=8) DMU, R1, R2
REAL(KIND=8) DONE, DZERO, NOM, DENOM
PARAMETER ( DONE=1.0D0, DZERO=0.0D0 )
*----
* ZMU CALCULATION
*----
NOM = DZERO
DENOM = DZERO
DO 3 IG= IG0,NG
DO 2 IR=1,NUN
R1 = FLUX(IR,IG,2) - FLUX(IR,IG,1)
R2 = FLUX(IR,IG,3) - FLUX(IR,IG,2)
NOM = NOM + R1*(R2-R1)
DENOM = DENOM + (R2-R1)*(R2-R1)
2 CONTINUE
3 CONTINUE
*
DMU = - NOM / DENOM
ZMU = DMU
IF( DMU.GT.DZERO )THEN
DO 13 IG= IG0,NG
DO 12 IR=1,NUN
*
* ACCELERATED VALUES FOR PHI(2) ET PHI(3)
FLUX(IR,IG,3) = FLUX(IR,IG,2) + DMU *
> (FLUX(IR,IG,3) - FLUX(IR,IG,2))
FLUX(IR,IG,2) = FLUX(IR,IG,1) + DMU *
> (FLUX(IR,IG,2) - FLUX(IR,IG,1))
12 CONTINUE
13 CONTINUE
ELSE
ZMU= DONE
ENDIF
RETURN
END
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