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+*DECK FLDBN2
+      SUBROUTINE FLDBN2 (NEL,LL4,IELEM,CYLIND,EVECT,XX,DD,MAT,VOL,IDL,
+     1 KN,LC,T,TS)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Calculation of the averaged flux with a primal finite element method.
+*
+*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): A. Hebert
+*
+*Parameters: input
+* NEL     total number of finite elements.
+* LL4     order of the system matrices.
+* IELEM   degree of the Lagrangian finite elements: =1 (linear);
+*         =2 (parabolic); =3 (cubic); =4 (quartic).
+* CYLIND  cylindrical geometry flag (set with CYLIND=.true.).
+* EVECT   variational coefficients of the flux. The information is
+*         contained in position EVECT(1) to EVECT(LL4).
+* XX      X-side of each element.
+* DD      used with cylindrical geometry.
+* MAT     mixture index assigned to each element.
+* VOL     volume of each element.
+* IDL     position of the average flux component associated with each
+*         volume.
+* KN      element-ordered unknown list.
+* LC      order of the finite element basis.
+* T       linear product vector.
+* TS      linear product vector.
+*
+*Parameters: output
+* EVECT   averaged fluxes. The information is contained in positions
+*         EVECT(IDL(I)).
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER NEL,LL4,IELEM,MAT(NEL),IDL(NEL),KN(NEL*IELEM*IELEM),LC
+      REAL EVECT(LL4+NEL),XX(NEL),DD(NEL),VOL(NEL),T(LC),TS(LC)
+      LOGICAL CYLIND
+*----
+*  LOCAL VARIABLES
+*----
+      INTEGER IJ1(25),IJ2(25)
+*----
+*  COMPUTE VECTORS IJ1 AND IJ2
+*----
+      LL=LC*LC
+      DO 10 I=1,LL
+      IJ1(I)=1+MOD(I-1,LC)
+      IJ2(I)=1+(I-IJ1(I))/LC
+   10 CONTINUE
+*
+      NUM1=0
+      DO 40 K=1,NEL
+      IF(MAT(K).EQ.0) GO TO 40
+      EVECT(IDL(K))=0.0
+      IF(VOL(K).EQ.0.0) GO TO 30
+      DO 20 I=1,LL
+      IND1=KN(NUM1+I)
+      IF(IND1.EQ.0) GO TO 20
+      I1=IJ1(I)
+      I2=IJ2(I)
+      IF(CYLIND) THEN
+         SS=(T(I1)+TS(I1)*XX(K)/DD(K))*T(I2)
+      ELSE
+         SS=T(I1)*T(I2)
+      ENDIF
+      EVECT(IDL(K))=EVECT(IDL(K))+SS*EVECT(IND1)
+   20 CONTINUE
+   30 NUM1=NUM1+LL
+   40 CONTINUE
+      RETURN
+      END