diff options
Diffstat (limited to 'Dragon/src/MOCSCAS.f')
| -rw-r--r-- | Dragon/src/MOCSCAS.f | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/Dragon/src/MOCSCAS.f b/Dragon/src/MOCSCAS.f new file mode 100644 index 0000000..cc536d3 --- /dev/null +++ b/Dragon/src/MOCSCAS.f @@ -0,0 +1,111 @@ +*DECK MOCSCAS + SUBROUTINE MOCSCAS(N,NREG,NSOUT,M,NOM,NZON,H,SIGANG,EXPT,EXP2, + 1 NMU,ZMU) +* +*----------------------------------------------------------------------- +* +*Purpose: +* Calculate coefficients of a track for the cyclic characteristics +* integration: Step-Characteristics scheme with tabulated exponential +* and '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. Roy and R. Le Tellier +* +*Parameters: input +* N number of elements in the current track. +* NREG number of volumes. +* NSOUT number of surfaces. +* 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. +* SIGANG macroscopic total cross sections and albedos. +* NMU order of the polar quadrature set. +* ZMU inverse of polar quadrature cosines. +* +*Parameters: output +* EXPT track coefficient. +* EXP2 quadratic expansion of (1-exp(-a*L))/L with small argument. +* +*----------------------------------------------------------------------- +* + IMPLICIT NONE +*---- +* SUBROUTINE ARGUMENTS +*---- + INTEGER N,NREG,NSOUT,M,NOM(N),NZON(-NSOUT:NREG),NMU + REAL SIGANG(-6:M),ZMU(NMU) + DOUBLE PRECISION H(N),EXPT(NMU,N),EXP2(2,NMU,N) +*---- +* LOCAL VARIABLES +*---- + INTEGER I,NOMI,NUMOLD,NZI,IMU + REAL TAU + DOUBLE PRECISION TAUDMIN,HID,TAUD,TEMP,HID2,TAUD3,TAUD4,TAUD5 +* tabulated exponential common block + REAL E0, E1, PAS1, DX1, XLIM1 + INTEGER MEX1, LAU + PARAMETER ( MEX1=7936, TAUDMIN=2.D-2 ) + COMMON /EXP1/ E0(0:MEX1),E1(0:MEX1),PAS1,DX1,XLIM1 +* + NUMOLD=NOM(1) + DO I=1,N + NOMI=NOM(I) + NZI=NZON(NOMI) + IF(NZI.LT.0) THEN + IF(NUMOLD.NE.NOMI) THEN + DO IMU=1,NMU + EXP2(1,IMU,I)=SIGANG(NZI) + EXPT(IMU,I)=EXP2(1,IMU,I) + ENDDO + ELSE + DO IMU=1,NMU + EXP2(1,IMU,I)=1.D0 + EXPT(IMU,I)=EXP2(1,IMU,I) + ENDDO + ENDIF + ELSE + DO IMU=1,NMU + HID=DBLE(H(I)*ZMU(IMU)) + TAUD=SIGANG(NZI)*HID + TAU=REAL(TAUD) + IF(TAU.GE.XLIM1) THEN +* Out of the table range + EXPT(IMU,I)=0.D0 + TEMP=1.D0/TAUD + EXP2(1,IMU,I)=TEMP*HID + EXP2(2,IMU,I)=HID*(1.D0-TEMP)/DBLE(SIGANG(NZI)) + ELSE +* Linear interpolation in table of (1-exp(-x))/x + LAU=INT(TAU*PAS1) + TEMP=DBLE(E0(LAU)+E1(LAU)*TAU) + EXPT(IMU,I)=1.D0-TEMP*TAUD + EXP2(1,IMU,I)=TEMP*HID + IF(TAUD.LE.TAUDMIN) THEN +* and expansion in Taylor serie in O(TAUD^3) + TAUD3=TAUD/3.D0 + TAUD4=0.125D0*TAUD + TAUD5=0.2D0*TAUD + HID2=HID*HID + EXP2(2,IMU,I)=HID2*(0.5D0-TAUD3*(0.5D0-TAUD4 + 1 *(1.D0-TAUD5))) + ELSE + EXP2(2,IMU,I)=HID*(1.D0-TEMP)/DBLE(SIGANG(NZI)) + ENDIF + ENDIF + ENDDO + ENDIF + NUMOLD=NOMI + ENDDO +* + RETURN + END |