dong_outflow.f90

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module dong_outflow
  use neko_config
  use dirichlet
  use device
  use num_types
  use bc
  use field
  use dofmap
  use coefs
  use utils
  use device_dong_outflow
  use field_registry, only : neko_field_registry
  use, intrinsic :: iso_c_binding, only : c_ptr, c_sizeof
  use json_module, only : json_file
  use json_utils, only : json_get, json_get_or_default
  implicit none
  private
 
  type, public, extends(bc_t) :: dong_outflow_t
     type(field_t), pointer :: u
     type(field_t), pointer :: v
     type(field_t), pointer :: w
     real(kind=rp) :: delta
     real(kind=rp) :: uinf
     type(c_ptr) :: normal_x_d
     type(c_ptr) :: normal_y_d
     type(c_ptr) :: normal_z_d
   contains
     procedure, pass(this) :: apply_scalar => dong_outflow_apply_scalar
     procedure, pass(this) :: apply_vector => dong_outflow_apply_vector
     procedure, pass(this) :: apply_scalar_dev => dong_outflow_apply_scalar_dev
     procedure, pass(this) :: apply_vector_dev => dong_outflow_apply_vector_dev
     procedure, pass(this) :: init => dong_outflow_init
     procedure, pass(this) :: free => dong_outflow_free
  end type dong_outflow_t
 
contains
  subroutine dong_outflow_init(this, coef, json)
    class(dong_outflow_t), intent(inout) :: this
    type(coef_t), intent(in) :: coef
    type(json_file), intent(inout) :: json
    real(kind=rp), allocatable :: temp_x(:)
    real(kind=rp), allocatable :: temp_y(:)
    real(kind=rp), allocatable :: temp_z(:)
    real(c_rp) :: dummy
    integer :: i, m, k, facet, idx(4)
    real(kind=rp) :: normal_xyz(3)
 
!    call this%dirichlet_t%init
 
    call json_get_or_default(json, 'case.fluid.outflow_condition.delta', &
                             this%delta, 0.01_rp)
    call json_get_or_default(json, 'case.fluid.outflow_condition.velocity_scale', &
                             this%uinf, 1.0_rp)
 
    this%u => neko_field_registry%get_field("u")
    this%v => neko_field_registry%get_field("v")
    this%w => neko_field_registry%get_field("w")
 
    if ((neko_bcknd_device .eq. 1) .and. (this%msk(0) .gt. 0)) then
       call device_alloc(this%normal_x_d, c_sizeof(dummy)*this%msk(0))
       call device_alloc(this%normal_y_d, c_sizeof(dummy)*this%msk(0))
       call device_alloc(this%normal_z_d, c_sizeof(dummy)*this%msk(0))
       m = this%msk(0)
       allocate(temp_x(m))
       allocate(temp_y(m))
       allocate(temp_z(m))
       do i = 1, m
          k = this%msk(i)
          facet = this%facet(i)
          idx = nonlinear_index(k,this%Xh%lx, this%Xh%lx,this%Xh%lx)
          normal_xyz = &
                 this%coef%get_normal(idx(1), idx(2), idx(3), idx(4),facet)
            temp_x(i) = normal_xyz(1)
            temp_y(i) = normal_xyz(2)
            temp_z(i) = normal_xyz(3)
         end do
         call device_memcpy(temp_x, this%normal_x_d, m, &
                            host_to_device, sync=.false.)
         call device_memcpy(temp_y, this%normal_y_d, m, &
                            host_to_device, sync=.false.)
         call device_memcpy(temp_z, this%normal_z_d, m, &
                            host_to_device, sync=.true.)
         deallocate( temp_x, temp_y, temp_z)
      end if
  end subroutine dong_outflow_init
 
  subroutine dong_outflow_apply_scalar(this, x, n, t, tstep)
    class(dong_outflow_t), intent(inout) :: this
    integer, intent(in) :: n
    real(kind=rp), intent(inout),  dimension(n) :: x
    real(kind=rp), intent(in), optional :: t
    integer, intent(in), optional :: tstep
    integer :: i, m, k, facet, idx(4)
    real(kind=rp) :: vn, s0, ux, uy, uz, normal_xyz(3)
 
    m = this%msk(0)
    do i = 1, m
       k = this%msk(i)
       facet = this%facet(i)
       ux = this%u%x(k,1,1,1)
       uy = this%v%x(k,1,1,1)
       uz = this%w%x(k,1,1,1)
       idx = nonlinear_index(k,this%Xh%lx, this%Xh%lx,this%Xh%lx)
       normal_xyz = this%coef%get_normal(idx(1), idx(2), idx(3), idx(4),facet)
       vn = ux*normal_xyz(1) + uy*normal_xyz(2) + uz*normal_xyz(3)
       s0 = 0.5_rp*(1.0_rp - tanh(vn / (this%uinf * this%delta)))
 
       x(k)=-0.5*(ux*ux+uy*uy+uz*uz)*s0
    end do
  end subroutine dong_outflow_apply_scalar
 
  subroutine dong_outflow_apply_vector(this, x, y, z, n, t, tstep)
    class(dong_outflow_t), intent(inout) :: this
    integer, intent(in) :: n
    real(kind=rp), intent(inout),  dimension(n) :: x
    real(kind=rp), intent(inout),  dimension(n) :: y
    real(kind=rp), intent(inout),  dimension(n) :: z
    real(kind=rp), intent(in), optional :: t
    integer, intent(in), optional :: tstep
 
  end subroutine dong_outflow_apply_vector
 
  subroutine dong_outflow_apply_scalar_dev(this, x_d, t, tstep)
    class(dong_outflow_t), intent(inout), target :: this
    type(c_ptr) :: x_d
    real(kind=rp), intent(in), optional :: t
    integer, intent(in), optional :: tstep
 
    call device_dong_outflow_apply_scalar(this%msk_d,x_d, this%normal_x_d, &
                                          this%normal_y_d, this%normal_z_d,&
                                          this%u%x_d, this%v%x_d, this%w%x_d,&
                                          this%uinf, this%delta,&
                                          this%msk(0))
 
  end subroutine dong_outflow_apply_scalar_dev
 
  subroutine dong_outflow_apply_vector_dev(this, x_d, y_d, z_d, t, tstep)
    class(dong_outflow_t), intent(inout), target :: this
    type(c_ptr) :: x_d
    type(c_ptr) :: y_d
    type(c_ptr) :: z_d
    real(kind=rp), intent(in), optional :: t
    integer, intent(in), optional :: tstep
 
    !call device_dong_outflow_apply_vector(this%msk_d, x_d, y_d, z_d, &
    !                                   this%g, size(this%msk))
 
  end subroutine dong_outflow_apply_vector_dev
 
  subroutine dong_outflow_free(this)
    class(dong_outflow_t), target, intent(inout) :: this
 
    call this%free_base
 
  end subroutine dong_outflow_free
 
end module dong_outflow