セミラグランジュ法で用いる定数

Constants for Semi-Lagrangian method

Methods

PIH PIx2 SLTTConstInit dtjw iexmax iexmin jexmaxn jexmaxs jexminn jexmins module_name nloop_dp_h nloop_dp_v sltt_const_inited version

Included Modules

dc_types dc_message gridset mpi_wrapper constants0

Public Instance methods

PIH

*Variable* :
`PIH` :	`real(DP), save`

PIx2

*Variable* :
`PIx2` :	`real(DP), save`

SLTTConstInit( )

Subroutine :

[Source]

  subroutine SLTTConstInit

    use gridset    , only : jmax
    use mpi_wrapper, only : nprocs, myrank
    use constants0 , only : PI


    !
    ! local variables
    !

    ! 実行文 ; Executable statement
    !

    if ( sltt_const_inited ) return


    PIx2 = PI + PI
    PIH  = PI / 2.0_DP


!!$    if( jew > jmax/2 ) then
!!$      write( 6, * ) "SLTT ERROR : MYRANK = ", myrank, &
!!$        " JEW = ", jew, " JMAX/2 = ", jmax/2
!!$      write( 6, * ) "SLTT ERROR : JEW MUST BE LESS THAN JMAX."
!!$      stop
!!$    end if
    if( nprocs > 1 ) then
      if( jmax/2 < dtjw ) then
!!$      if( jmax/2 < jew ) then
        write( 6, * ) "SLTT ERROR : MYRANK = ", myrank, " JMAX/2 = ", jmax/2, " TRANSFERED J WIDTH = ", dtjw
        write( 6, * ) "SLTT ERROR : JMAX MUST BE GREATER THAN TRANSFERED J WIDTH."
        stop
      end if
    end if


    ! Set minimum and maximu indices for south-north separate extended arrays
    iexmin = -2          ! width of halo region of dtjw
    iexmax = imax-1+1+2  ! 1 for 360 longitude and width of halo region of dtjw
    if ( myrank == (nprocs-1) ) then
      jexmins = -dtjw          ! minimum j of southern array
      jexmaxs = jmax/2+dtjw    ! maximum j of southern array
      jexminn = -dtjw+1        ! maximum j of northern array
      jexmaxn = jmax/2+1+dtjw  ! maximum j of northern array
    else
      jexmins = -dtjw+1        ! minimum j of southern array
      jexmaxs = jmax/2+dtjw    ! maximum j of southern array
      jexminn = -dtjw+1        ! maximum j of northern array
      jexmaxn = jmax/2+dtjw    ! maximum j of northern array
    end if


    sltt_const_inited = .true.

  end subroutine SLTTConstInit

dtjw

*Constant* :
`dtjw` `= 2` :	`integer, parameter`

iexmax

*Variable* :
`iexmax` :	`integer, save`

iexmin

*Variable* :
`iexmin` :	`integer, save`

jexmaxn

Variable :

jexmaxn :

integer, save

jew : latitudinal edge width

    : jew >= 4 and dtjw (dtjw is defined below)
    : In the current version of implimented semi-Lagrangian scheme,
    : the lower limit of jew is 4, which is restricted by the number of
    : latitudinal grids needed to estimate values at poles.

!$ integer, parameter :

jew = 3

dtjw : data transfer latitudinal grid width !$ ! : int( C * 2 ) + 3 <= mpjwidth <= jmax and jew !$ ! : The mpjwidth must be less than jmax and jew, which is defined !$ ! : above. !$ ! : The lower limit of mpjwidth is 3, if the Courant number is !$ ! : less than 0.5. !$ ! : The lower limit of mpjwidth is 4, if the Courant number is !$ ! : greater than 0.5 and less than 1. !$ ! : The lower limit of mpjwidth is 5, if the Courant number is !$ ! : greater than 1 and less than 1.5. !$ ! : (But now, if the Courant number is greater than 0.5, this !$ ! : routine would stop in sltt_dp_h and sltt_hiq routines.) !$ !

jexmaxs

*Variable* :
`jexmaxs` :	`integer, save`

jexminn

*Variable* :
`jexminn` :	`integer, save`

jexmins

*Variable* :
`jexmins` :	`integer, save`

nloop_dp_h

*Variable* :
`nloop_dp_h` `= 4` :	`integer, save`

nloop_dp_v

*Variable* :
`nloop_dp_v` `= 4` :	`integer, save`

Private Instance methods

module_name

Constant :

module_name = ‘sltt_const‘ :

character(*), parameter

:	モジュールの名称. Module name

sltt_const_inited

Variable :

sltt_const_inited = .false. :

logical, save

:	初期設定フラグ. Initialization flag

version