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Diffstat (limited to 'Dragon/src/BRESS4.f')
| -rw-r--r-- | Dragon/src/BRESS4.f | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/Dragon/src/BRESS4.f b/Dragon/src/BRESS4.f new file mode 100644 index 0000000..7e13103 --- /dev/null +++ b/Dragon/src/BRESS4.f @@ -0,0 +1,53 @@ + SUBROUTINE BRESS4(ITRIAL,XX,DIFF,SIGR,SIGT,B11) +* +*----------------------------------------------------------------------- +* +*Purpose: +* Assembly of non-leakage system matrices for the nodal expansion +* method. Include the conservation equation. +* +*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) +* XX mesh width. +* DIFF diffusion coefficient. +* SIGR macroscopic removal cross section. +* SIGT macroscopic cross section. +* +*Parameters: output +* B11 nodal matrix. +* +*----------------------------------------------------------------------- +* +*---- +* SUBROUTINE ARGUMENTS +*---- + INTEGER ITRIAL + REAL XX,DIFF,SIGR,SIGT,B11(5,5) +*---- +* WEIGHT RESIDUAL EQUATIONS +*---- + B11(:5,:5)=0.0 + ETA=XX*SQRT(SIGR/DIFF) + B11(1,1)=SIGT + B11(2,2)=SIGT/12.0 + B11(3,3)=SIGT/20.0 + IF(ITRIAL == 1) THEN + B11(2,4)=-SIGT/120.0 + B11(3,5)=-SIGT/700.0 + ELSE IF(ITRIAL == 2) THEN + 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(2,4)=SIGT*ALP1/(ETA**2) + B11(3,5)=SIGT*ALP2/(ETA**2) + ENDIF + RETURN + END |