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Diffstat (limited to 'Trivac/src/NSS3TR.f')
| -rwxr-xr-x | Trivac/src/NSS3TR.f | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/Trivac/src/NSS3TR.f b/Trivac/src/NSS3TR.f new file mode 100755 index 0000000..237f27d --- /dev/null +++ b/Trivac/src/NSS3TR.f @@ -0,0 +1,58 @@ +*DECK NSS3TR + SUBROUTINE NSS3TR(ITRIAL,NEL,NMIX,MAT,XX,DIFF,SIGR,SIGT,B11) +* +*----------------------------------------------------------------------- +* +*Purpose: +* Assembly of fission system matrices for the nodal expansion method. +* +*Copyright: +* Copyright (C) 2021 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 +* ITRIAL type of base (=1: polynomial; =2: hyperbolic) +* NEL number of nodes +* NMIX number of mixtures +* MAT node mixtures +* XX node widths +* DIFF diffusion coefficients. +* SIGR macroscopic removal cross section. +* SIGT fission cross section. +* +*Parameters: output +* B11 assembly matrix. +* +*----------------------------------------------------------------------- +* + INTEGER ITRIAL(NMIX),NEL,NMIX,MAT(NEL) + REAL XX(NEL),DIFF(NMIX),SIGR(NMIX),SIGT(NMIX),B11(5*NEL,5*NEL) +* + B11(:5*NEL,:5*NEL)=0.0 + NUM1=0 + DO KEL=1,NEL + IBM=MAT(KEL) + SIGG=SIGT(IBM) + ETA=XX(KEL)*SQRT(SIGR(IBM)/DIFF(IBM)) + ! WEIGHT RESIDUAL EQUATIONS: + B11(NUM1+1,NUM1+1)=SIGG + B11(NUM1+2,NUM1+2)=SIGG/12.0 + B11(NUM1+3,NUM1+3)=SIGG/20.0 + IF(ITRIAL(IBM) == 1) THEN + B11(NUM1+2,NUM1+4)=-SIGG/120.0 + B11(NUM1+3,NUM1+5)=-SIGG/700.0 + ELSE + ALP1=ETA*COSH(ETA/2.0)-2.0*SINH(ETA/2.0) + ALP2=((12.0+ETA**2)*SINH(ETA/2.0)-6.0*ETA*COSH(ETA/2.0))/ETA + B11(NUM1+2,NUM1+4)=SIGG*ALP1/(ETA**2) + B11(NUM1+3,NUM1+5)=SIGG*ALP2/(ETA**2) + ENDIF + NUM1=NUM1+5 + ENDDO + RETURN + END SUBROUTINE NSS3TR |