compute_bfrac.F

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!||====================================================================
!||    compute_bfrac   ../engine/source/materials/mat/mat051/compute_bfrac.F
!||--- called by ------------------------------------------------------
!||    sigeps51        ../engine/source/materials/mat/mat051/sigeps51.F90
!||====================================================================
      SUBROUTINE compute_bfrac(TIME,XL,TBURN,UPARAM,V1,RHO1,RHO10,BFRAC)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   I N P U T   O U T P U T   A r g u m e n t s 
C-----------------------------------------------
      my_real time,xl,tburn,v1,rho1,rho10,uparam(*),bfrac
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER ibug, IBFRAC
      my_real vdet,bhe
C-----------------------------------------------
      vdet  = uparam(42)
      bhe   = uparam(44)
      ibfrac= uparam(68)
 
      !--------------------------------!
      ! Calculation of BFRAC in [0,1]  !
      !--------------------------------!
      IF(bfrac < one) THEN
        bfrac = zero
        IF(ibfrac/=1 .AND. time > -tburn)THEN
          xl = v1**third
          bfrac = vdet*(time+tburn)*two_third/xl 
        ENDIF
        IF(ibfrac/=2) bfrac  = max( bfrac , bhe * (one - rho10/rho1) )
        IF(bfrac < em03) THEN
          bfrac = zero
        ELSEIF(bfrac > one) THEN
          bfrac = one
        ENDIF
      ENDIF
      RETURN
      END