/home/uryu/Cocal_svn_checkinout/Cocal/code/Subroutine/bh_boundary_test.f90

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subroutine bh_boundary_test(char_bc,sou_surf,dsou_surf)
  use phys_constant, only  : long
  use grid_parameter, only : nrg, ntg, npg, rgin
  use trigonometry_grav_theta, only : hsinthg
  use trigonometry_grav_phi,   only : hcosphig
  use def_binary_parameter,    only : sepa
  implicit none
  character(len=2), intent(in) :: char_bc
  real(long), pointer :: sou_surf(:,:), dsou_surf(:,:)
  real(long) :: st, cp, rad1, rad2, dr2dr1, bhmass
  integer    :: itg, ipg
!
  bhmass = 2.0d0*rgin
  do ipg = 1, npg
    do itg = 1, ntg
      st = hsinthg(itg)
      cp = hcosphig(ipg)
      rad1 = rgin
      rad2 = sqrt(rad1**2 - 2.0d0*rad1*sepa*st*cp + sepa**2)
      dr2dr1 = (rad1 - sepa*st*cp)/rad2
      if (char_bc.eq.'dh') then 
        sou_surf(itg,ipg) = 1.0d0 + 0.5d0*bhmass/rad1 + 0.5d0*bhmass/rad2
      end if
      if (char_bc.eq.'nh') then
        dsou_surf(itg,ipg) = - 0.5d0*bhmass/rad1**2 &
       &                     - 0.5d0*bhmass/rad2**2*dr2dr1
      end if
    end do
  end do
!
end subroutine bh_boundary_test

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