PERI_coCprInitSolutionFlu.F90

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!******************************************************************************
!
! Purpose: Initialisation of CPR solutions
!
! Description: IF starts from t=0, set density and pressure as single values
!              as function of axial position using 1D compressible relations,
!              can be found in AIAA-86-1447 (Traineau, Hervat and Kuentsmann).
!              The remaining conservative variables are due to Taylor solution
!              which vary in injection normal direction.
!              IF restart from t/=0, read solution from main solution file
!              and cpr pressure gradient from specific cpr solution file.
!
! Input: region = data of current region
!
! Output: CPR solution to start simulation
!
! Notes: none.
!
!******************************************************************************
!
! $Id: PERI_coCprInitSolutionFlu.F90,v 1.5 2008/12/06 08:44:37 mtcampbe Exp $
!
! Copyright: (c) 2001 by the University of Illinois
!
!******************************************************************************

SUBROUTINE peri_cocprinitsolution( region )

  USE moddatatypes
  USE moddatastruct, ONLY : t_region
  USE modglobal, ONLY     : t_global
  USE modinterfaces, ONLY : mixtperf_eo_dgpvm
  USE moderror
  USE modparameters
  USE peri_modparameters
  IMPLICIT NONE

! ... parameters
  TYPE (t_region) :: region

! ... loop variables
  INTEGER :: ijkc

! ... local variables
  CHARACTER(CHRLEN)       :: rcsidentstring
  TYPE(t_global), POINTER     :: global

  INTEGER  :: ijkcr, ijkn, ijkn1
  REAL(RFREAL), POINTER :: xyz(:,:), cofg(:,:), cv(:,:), dv(:,:)
  REAL(RFREAL) :: pi, gamma, gogampls, delta, minj, mfrat, refmassflux
  REAL(RFREAL) :: throatmflux, cpreps, headpres, headtemp, headsv, rgas
  REAL(RFREAL) :: phi, mach, yc, denom, choklen, hvinj
  REAL(RFREAL) :: rho, pres, vm, eo

!******************************************************************************

  rcsidentstring = '$RCSfile: PERI_coCprInitSolutionFlu.F90,v $ $Revision: 1.5 $'

  global => region%global
  CALL registerfunction( global,'PERI_CoCprInitSolution',&
  'PERI_coCprInitSolutionFlu.F90' )

! get parameters and pointers ----------------------------------------------

  xyz  => region%grid%xyz
  cofg => region%grid%cofg
  cv   => region%mixt%cv
  dv   => region%mixt%dv

  pi       = global%pi
  rgas     = 287._rfreal
  gamma    = global%refGamma
  gogampls = gamma / (gamma + 1._rfreal)
  cpreps   = region%periInput%cprEpsilon
  headpres = region%periInput%headPres
  headtemp = region%periInput%headTemp
  delta    = global%refLength
write(*,*)global%currentTime
  IF ((global%flowType==flow_unsteady .AND. &
       global%currentTime < peri_real_small) .OR. &
      (global%flowType==flow_steady .AND. global%currentIter==0)) THEN

! - first cleanup conservative variables cv     
    cv(:,:) = 0._rfreal
write(*,*)headpres,headtemp
! - refMassFlux is the mass flux at the streamwise location x/h=1/cprEpsilon
    minj        = region%periInput%minjRate 
    refmassflux = region%periInput%bulkmFlux

! - bulk averaged mass flux corresponding to CPR sonic conditions
    throatmflux = 2._rfreal*delta*gamma*headpres/ &
                  sqrt(2._rfreal*gogampls*rgas*headtemp)

! - non dimensinal distance head end to choking location L/h:
    headsv  = sqrt( gamma*rgas*headtemp )
    denom   = headsv*minj*sqrt( 2._rfreal*(gamma+1._rfreal) )
    choklen = headpres*gamma/denom

! - mfRat is ratio of bulk mass flux to mass flux corresp. to sonic conditions
    mfrat = refmassflux/throatmflux

! - or mfRat can be defined as axial coordinate normalized by choklen
    mfrat = 1._rfreal/cpreps/choklen

! - compute nondimensional axial parameter phi defined as
    phi = sqrt(1._rfreal - mfrat*mfrat)

! - pressure and density axial distribution
    rho  = 0.5_rfreal*headpres*(1._rfreal+phi)/(rgas*headtemp)
    pres = (1.d0+gamma*phi)*headpres/(1._rfreal+gamma)
    cv(cv_mixt_dens,:) = rho
    dv(dv_mixt_pres,:) = pres
    cv(cv_mixt_zmom,:) = 0._rfreal

! - mach number and head-end injection velocity
    mach = sqrt((1._rfreal-phi)/(1._rfreal+gamma*phi))
    hvinj= minj*rgas*headtemp/headpres
write(*,*)cv(cv_mixt_dens,1),dv(dv_mixt_pres,1),choklen,mach
write(*,*)mfrat,phi,mach,hvinj

    DO ijkc = 1, region%grid%nCellsTot
      yc = cofg(ycoord,ijkc)

      cv(cv_mixt_xmom,ijkc) = minj/rho*0.5_rfreal*pi/cpreps* &        
                              cos( 0.5_rfreal*pi*yc/delta )*rho
      cv(cv_mixt_ymom,ijkc) = -minj/rho*sin( 0.5_rfreal*pi*yc/delta )*rho

      vm = sqrt( cv(cv_mixt_xmom,ijkc)*cv(cv_mixt_xmom,ijkc) + &
                 cv(cv_mixt_ymom,ijkc)*cv(cv_mixt_ymom,ijkc) + &        
                 cv(cv_mixt_zmom,ijkc)*cv(cv_mixt_zmom,ijkc))/rho
      eo = mixtperf_eo_dgpvm(rho,gamma,pres,vm)
      cv(cv_mixt_ener,ijkc) = rho*eo
    END DO

  ELSE

! - previous pressure gradient is read from main solution file

    region%periInput%meanPgrad = global%moduleVar(1)
    write(*,*) global%myProcId,' cprMeanPgrad ', region%periInput%meanPgrad

  ENDIF       

! finalize --------------------------------------------------------

  CALL deregisterfunction( global )

END SUBROUTINE peri_cocprinitsolution

!******************************************************************************
!
! RCS Revision history:
!
! $Log: PERI_coCprInitSolutionFlu.F90,v $
! Revision 1.5  2008/12/06 08:44:37  mtcampbe
! Updated license.
!
! Revision 1.4  2008/11/19 22:17:49  mtcampbe
! Added Illinois Open Source License/Copyright
!
! Revision 1.3  2004/06/17 20:03:27  wasistho
! compiled with RFLU
!
! Revision 1.2  2004/06/17 00:50:28  wasistho
! prepared for RFLU
!
! Revision 1.1  2004/06/09 01:10:26  wasistho
! changed nomenclature
!
!
!
!******************************************************************************