From 7dfcc480ba1e19bd3232349fc733caef94034292 Mon Sep 17 00:00:00 2001 From: stainer_t Date: Mon, 8 Sep 2025 13:48:49 +0200 Subject: Initial commit from Polytechnique Montreal --- Dragon/src/MCGDDFS.f | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 Dragon/src/MCGDDFS.f (limited to 'Dragon/src/MCGDDFS.f') diff --git a/Dragon/src/MCGDDFS.f b/Dragon/src/MCGDDFS.f new file mode 100644 index 0000000..396c2ed --- /dev/null +++ b/Dragon/src/MCGDDFS.f @@ -0,0 +1,61 @@ +*DECK MCGDDFS + SUBROUTINE MCGDDFS(N,K,M,NOM,NZON,H,XST,B) +* +*----------------------------------------------------------------------- +* +*Purpose: +* Calculate coefficients of a track for the characteristics integration. +* Diamond-Differencing scheme without fix-up with +* 'source term isolation' option turned off. +* +*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): R. Le Tellier +* +*Parameters: input +* N number of elements in the current track. +* K total number of volumes for which specific values +* of the neutron flux and reactions rates are required. +* M number of material mixtures. +* NOM vector containing the region number of the different segments +* of this track. +* NZON index-number of the mixture type assigned to each volume. +* H vector containing the lenght of the different segments of this +* track. +* XST macroscopic total cross section. +* +*Parameters: output +* B DD1 coefficients. +* +*----------------------------------------------------------------------- +* + IMPLICIT NONE +*---- +* SUBROUTINE ARGUMENTS +*---- + INTEGER N,K,M,NOM(N),NZON(K) + REAL XST(0:M) + DOUBLE PRECISION H(N),B(2,N) +*--- +* LOCAL VARIABLES +*--- + INTEGER I,NOMI,NZI + DOUBLE PRECISION TAUD,HID,TEMP +* + DO I=2,N-1 + NOMI=NOM(I) + NZI=NZON(NOMI) + HID=H(I) + TAUD=HID*XST(NZI) + TEMP=HID/(2.D0+TAUD) + B(1,I)=TEMP+TEMP + B(2,I)=HID*TEMP + ENDDO +* + RETURN + END -- cgit v1.2.3