Gas EBU example

Gas EBU 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

integer, allocatable, dimension(:) :: lstelt
double precision, dimension(:), pointer :: cvar_ygfm, cvar_fm, cvar_scalt

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

!    For 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 mean gas mixture
!       (unburned - or fresh- gas at mean mixture fraction)
  if ( ippmod(icoebu).eq.1 .or. ippmod(icoebu).eq.3 ) then
    coefg(1) = fmelm
    coefg(2) = (1.d0-fmelm)
    coefg(3) = zero
    mode     = -1

!       Converting the mean boundary conditions into
!       enthalpy values
    call cothht                                                   &
    !==========
        ( mode   , ngazg , ngazgm  , coefg  ,                     &
          npo    , npot   , th     , ehgazg ,                     &
          hinit  , tentm )
  endif

! b. Initialisation

  do iel = 1, ncel

! ----- Mass fraction of Unburned Gas

    cvar_ygfm(iel) = 5.d-1

! ----- Mean Mixture Fraction

    if ( ippmod(icoebu).eq.2 .or. ippmod(icoebu).eq.3 ) then
      cvar_fm(iel) = fmelm
    endif

! ----- Enthalpy

    if ( ippmod(icoebu).eq.1 .or. ippmod(icoebu).eq.3 ) then
      cvar_scalt(iel) = hinit
    endif

  enddo

endif

Finalization

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