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*DECK SNADPT
SUBROUTINE SNADPT(IELEM,NM,NMX,M,MX,TB,W,ISFIX)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Compute the weighting parameters for SN adaptive flux calculation,
* based on flux variation in the cell.
*
*Copyright:
* Copyright (C) 2020 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): C. Bienvenue
*
*Parameters: input
* IELEM measure of order of the closure relation.
* NM number of flux moments.
* NMX number of incoming flux moments.
* M moments of the flux.
* MX incoming flux moments.
* TB ratio (space=1, energy=ratio of boundary stopping powers).
*
*Parameters: input and output
* W weighting parameters of the closure relation.
* ISFIX flag indicating if moments sould be recalculated.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER IELEM,NM,NMX
REAL W(IELEM+1),TB
DOUBLE PRECISION M(NM),MX(NMX)
LOGICAL ISFIX
*----
* LOCAL VARIABLES
*----
REAL P,U1,F1
PARAMETER(EPS=1.0E-8,B=2.0)
*----
* CONSTANT ORDER ADAPTIVE CALCULATIONS
*----
IF(IELEM.EQ.1) THEN
! EXTRACT P
P=-W(1)/TB
! CASE P = 1
IF(ABS(P-1).LE.EPS) THEN
IF(M(1).NE.0) THEN
U1=REAL((MX(1)-M(1))/M(1)) ! FLUX VARIATION IN CELL
F1=2.0*B*ABS(U1)
IF(F1.LE.1) THEN
P=1.0
ISFIX=.TRUE.
ELSE
P=1.0/F1
ISFIX=.FALSE.
ENDIF
ELSE
P=0.0
ISFIX=.FALSE.
ENDIF
! CASE 0 <= P < 1
ELSE
ISFIX=.TRUE.
ENDIF
! COMPUTE WEIGHTING FACTORS
W(1)=-P*TB
W(2)=1+P*TB
*----
* LINEAR ORDER ADAPTIVE CALCULATIONS
*----
ELSEIF(IELEM.EQ.2) THEN
CALL XABORT('SNADPT: LINEAR ORDER ADAPTIVE CALCULATIONS NOT'
1 //'IMPLEMENTED YET')
ELSE
CALL XABORT('SNADPT: QUADRATIC AND HIGHER ORDER ADAPTIVE'
1 //'CALCULATIONS NOT IMPLEMENTED YET')
ENDIF
RETURN
END
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