Libby-Williams gas example

Libby-Williams gas example

Local variables to be added

The following local variables need to be defined for the examples in this section:

integer          iel, mode, igg, izone
double precision hinit, coefg(ngazgm)
double precision sommqf, sommqt, sommq, tentm, fmelm
 
 
character(len=80) :: chaine
integer           :: iscal, ivar, ii
double precision  :: valmax, valmin
 
integer, allocatable, dimension(:) :: lstelt
double precision, dimension(:), pointer :: cvar_yfm, cvar_fm, cvar_cyfp2m
double precision, dimension(:), pointer :: cvar_fp2m, cvar_coyfp
double precision, dimension(:), pointer :: cvar_scalt, cvar_scal

Allocation

Before user initialization, work arrays lstelt must be allocated, like in basic example.

Initialization

The following initialization block needs to be added for the following examples:

allocate(lstelt(ncel)) ! temporary array for cells selection
 
! Control output
 
write(nfecra,9001)
 
do igg = 1, ngazgm
  coefg(igg) = zero
enddo
 
!===============================================================================
! Variables initialization:
!
!   ONLY done if there is no restart computation
!===============================================================================
 
if ( isuite.eq.0 ) then
 
  ! a. Preliminary calculations
 
  sommqf = zero
  sommq  = zero
  sommqt = zero
 
  !  Deals with multiple inlets
  do izone = 1, nozapm
    sommqf = sommqf + qimp(izone)*fment(izone)
    sommqt = sommqt + qimp(izone)*tkent(izone)
    sommq  = sommq  + qimp(izone)
  enddo
 
  if (abs(sommq).gt.epzero) then
    fmelm = sommqf / sommq
    tentm = sommqt / sommq
  else
    fmelm = zero
    tentm = t0
  endif
 
  ! ----- Calculation of the Enthalpy of the gas mixture
  !       (unburned mean gas)
 
  if ( ippmod(icolwc).eq.1 .or. ippmod(icolwc).eq.3               &
                           .or. ippmod(icolwc).eq.5 ) then
    coefg(1) = fmelm
    coefg(2) = (1.d0-fmelm)
    coefg(3) = zero
    mode     = -1
 
    !   Converting the mean temperatur boundary conditions into
    !   enthalpy values
    call cothht                                                   &
    !==========
      ( mode   , ngazg , ngazgm  , coefg  ,                       &
        npo    , npot   , th     , ehgazg ,                       &
        hinit  , tentm )
  endif
 
  do iel = 1, ncel
 
    ! b. Initialisation
 
    ! Mass fraction of Unburned (fresh) Gas
    cvar_yfm(iel)  = 0.0d0*fmelm
    ! Mean Mixture Fraction
    cvar_fm(iel)   = 0.d0*fmelm
    ! Variance of fuel Mass fraction
    cvar_cyfp2m(iel) = zero
    ! Variance of Mixture Fraction
    cvar_fp2m(iel)  = zero
 
    ! Covariance for NDIRAC >= 3
 
    if ( ippmod(icolwc).ge. 2 ) then
      cvar_coyfp(iel)   = zero
    endif
 
    ! Enthalpy
 
    if ( ippmod(icolwc).eq.1 .or. ippmod(icolwc).eq.3             &
                             .or. ippmod(icolwc).eq.5 ) then
      cvar_scalt(iel) = hinit
    endif
 
  enddo
 
  ! ---> Control Output of the user defined initialization values
 
  write(nfecra,2000)
 
  do ii  = 1, nscapp
    iscal = iscapp(ii)
    ivar  = isca(iscal)
    call field_get_val_s(ivarfl(isca(ivar)), cvar_scal)
    valmax = -grand
    valmin =  grand
    do iel = 1, ncel
      valmax = max(valmax,cvar_scal(iel))
      valmin = min(valmin,cvar_scal(iel))
    enddo
    if ( irangp.ge.0 ) then
      call parmax(valmax)
      call parmin(valmin)
    endif
 
    call field_get_label(ivarfl(ivar), chaine)
    write(nfecra,2010)chaine(1:8),valmin,valmax
  enddo
  write(nfecra,2020)
 
endif

Finalization

At the end of the subroutine, it is recommended to deallocate the work array lstelt, like in basic example.