blasius.f90

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module blasius
  use num_types, only : rp
  use coefs, only : coef_t
  use utils, only : nonlinear_index
  use device, only : host_to_device, device_memcpy, device_free, device_alloc
  use device_inhom_dirichlet, only : device_inhom_dirichlet_apply_vector
  use flow_profile, only : blasius_profile, blasius_linear, blasius_quadratic, &
       blasius_cubic, blasius_quartic, blasius_sin, blasius_tanh
  use utils, only : neko_error
  use, intrinsic :: iso_fortran_env
  use, intrinsic :: iso_c_binding
  use bc, only : bc_t
  use json_module, only : json_file
  use json_utils, only : json_get, json_get_or_lookup
  use time_state, only : time_state_t
  implicit none
  private
 
  type, public, extends(bc_t) :: blasius_t
     real(kind=rp), dimension(3) :: uinf = [0d0, 0d0, 0d0]
     real(kind=rp) :: delta
     procedure(blasius_profile), nopass, pointer :: bla => null()
     type(c_ptr), private :: blax_d = c_null_ptr
     type(c_ptr), private :: blay_d = c_null_ptr
     type(c_ptr), private :: blaz_d = c_null_ptr
   contains
     procedure, pass(this) :: apply_scalar => blasius_apply_scalar
     procedure, pass(this) :: apply_vector => blasius_apply_vector
     procedure, pass(this) :: apply_scalar_dev => blasius_apply_scalar_dev
     procedure, pass(this) :: apply_vector_dev => blasius_apply_vector_dev
     procedure, pass(this) :: set_params => blasius_set_params
     procedure, pass(this) :: init => blasius_init
     procedure, pass(this) :: init_from_components => &
          blasius_init_from_components
     procedure, pass(this) :: free => blasius_free
     procedure, pass(this) :: finalize => blasius_finalize
  end type blasius_t
 
contains
 
  subroutine blasius_init(this, coef, json)
    class(blasius_t), intent(inout), target :: this
    type(coef_t), target, intent(in) :: coef
    type(json_file), intent(inout) :: json
    real(kind=rp) :: delta
    real(kind=rp), allocatable :: uinf(:)
    character(len=:), allocatable :: approximation
 
    call this%init_base(coef)
 
    call json_get_or_lookup(json, 'delta', delta)
    call json_get(json, 'approximation', approximation)
    call json_get_or_lookup(json, 'freestream_velocity', uinf)
 
    if (size(uinf) .ne. 3) then
       call neko_error("The uinf keyword for the blasius profile should be an &
       & array of 3 reals")
    end if
 
    call this%init_from_components(coef, delta, uinf, approximation)
 
  end subroutine blasius_init
 
  subroutine blasius_init_from_components(this, coef, delta, uinf, &
       approximation)
    class(blasius_t), intent(inout), target :: this
    type(coef_t), target, intent(in) :: coef
    real(kind=rp) :: delta
    real(kind=rp) :: uinf(3)
    character(len=*) :: approximation
 
    call this%init_base(coef)
 
    this%delta = delta
    this%uinf = uinf
 
    select case (trim(approximation))
    case ('linear')
       this%bla => blasius_linear
    case ('quadratic')
       this%bla => blasius_quadratic
    case ('cubic')
       this%bla => blasius_cubic
    case ('quartic')
       this%bla => blasius_quartic
    case ('sin')
       this%bla => blasius_sin
    case ('tanh')
       this%bla => blasius_tanh
    case default
       call neko_error('Invalid Blasius approximation')
    end select
  end subroutine blasius_init_from_components
 
  subroutine blasius_free(this)
    class(blasius_t), target, intent(inout) :: this
 
    call this%free_base()
    nullify(this%bla)
 
    if (c_associated(this%blax_d)) then
       call device_free(this%blax_d)
    end if
 
    if (c_associated(this%blay_d)) then
       call device_free(this%blay_d)
    end if
 
    if (c_associated(this%blaz_d)) then
       call device_free(this%blaz_d)
    end if
 
  end subroutine blasius_free
 
  subroutine blasius_apply_scalar(this, x, n, time, strong)
    class(blasius_t), intent(inout) :: this
    integer, intent(in) :: n
    real(kind=rp), intent(inout), dimension(n) :: x
    type(time_state_t), intent(in), optional :: time
    logical, intent(in), optional :: strong
  end subroutine blasius_apply_scalar
 
  subroutine blasius_apply_scalar_dev(this, x_d, time, strong, strm)
    class(blasius_t), intent(inout), target :: this
    type(c_ptr), intent(inout) :: x_d
    type(time_state_t), intent(in), optional :: time
    logical, intent(in), optional :: strong
    type(c_ptr), intent(inout) :: strm
  end subroutine blasius_apply_scalar_dev
 
  subroutine blasius_apply_vector(this, x, y, z, n, time, strong)
    class(blasius_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
    type(time_state_t), intent(in), optional :: time
    logical, intent(in), optional :: strong
    integer :: i, m, k, idx(4), facet
    logical :: strong_
 
    if (present(strong)) then
       strong_ = strong
    else
       strong_ = .true.
    end if
 
    associate(xc => this%coef%dof%x, yc => this%coef%dof%y, &
         zc => this%coef%dof%z, nx => this%coef%nx, ny => this%coef%ny, &
         nz => this%coef%nz, lx => this%coef%Xh%lx)
      m = this%msk(0)
      if (strong_) then
         !$omp do
         do i = 1, m
            k = this%msk(i)
            facet = this%facet(i)
            idx = nonlinear_index(k, lx, lx, lx)
            select case (facet)
            case (1, 2)
               x(k) = this%bla(zc(idx(1), idx(2), idx(3), idx(4)), &
                    this%delta, this%uinf(1))
               y(k) = 0.0_rp
               z(k) = 0.0_rp
            case (3, 4)
               x(k) = 0.0_rp
               y(k) = this%bla(xc(idx(1), idx(2), idx(3), idx(4)), &
                    this%delta, this%uinf(2))
               z(k) = 0.0_rp
            case (5, 6)
               x(k) = 0.0_rp
               y(k) = 0.0_rp
               z(k) = this%bla(yc(idx(1), idx(2), idx(3), idx(4)), &
                    this%delta, this%uinf(3))
            end select
         end do
         !$omp end do
      end if
    end associate
  end subroutine blasius_apply_vector
 
  subroutine blasius_apply_vector_dev(this, x_d, y_d, z_d, time, strong, strm)
    class(blasius_t), intent(inout), target :: this
    type(c_ptr), intent(inout) :: x_d
    type(c_ptr), intent(inout) :: y_d
    type(c_ptr), intent(inout) :: z_d
    type(time_state_t), intent(in), optional :: time
    logical, intent(in), optional :: strong
    integer :: i, m, k, idx(4), facet
    integer(c_size_t) :: s
    real(kind=rp), allocatable :: bla_x(:), bla_y(:), bla_z(:)
    logical :: strong_
    type(c_ptr), intent(inout) :: strm
 
    if (present(strong)) then
       strong_ = strong
    else
       strong_ = .true.
    end if
 
    associate(xc => this%coef%dof%x, yc => this%coef%dof%y, &
         zc => this%coef%dof%z, nx => this%coef%nx, ny => this%coef%ny, &
         nz => this%coef%nz, lx => this%coef%Xh%lx , &
         blax_d => this%blax_d, blay_d => this%blay_d, &
         blaz_d => this%blaz_d)
 
      m = this%msk(0)
 
 
      ! Pretabulate values during first call to apply.
      !$omp single
      if (.not. c_associated(blax_d) .and. strong_ .and. m .gt. 0) then
         allocate(bla_x(m), bla_y(m), bla_z(m)) ! Temp arrays
 
         if (rp .eq. real32) then
            s = m * 4
         else if (rp .eq. real64) then
            s = m * 8
         end if
 
         call device_alloc(blax_d, s)
         call device_alloc(blay_d, s)
         call device_alloc(blaz_d, s)
         !$omp parallel do private(k, facet, idx)
         do i = 1, m
            k = this%msk(i)
            facet = this%facet(i)
            idx = nonlinear_index(k, lx, lx, lx)
            select case (facet)
            case (1,2)
               bla_x(i) = this%bla(zc(idx(1), idx(2), idx(3), idx(4)), &
                    this%delta, this%uinf(1))
               bla_y(i) = 0.0_rp
               bla_z(i) = 0.0_rp
            case (3,4)
               bla_x(i) = 0.0_rp
               bla_y(i) = this%bla(xc(idx(1), idx(2), idx(3), idx(4)), &
                    this%delta, this%uinf(2))
               bla_z(i) = 0.0_rp
            case (5,6)
               bla_x(i) = 0.0_rp
               bla_y(i) = 0.0_rp
               bla_z(i) = this%bla(yc(idx(1), idx(2), idx(3), idx(4)), &
                    this%delta, this%uinf(3))
            end select
         end do
         !$omp end parallel do
 
         call device_memcpy(bla_x, blax_d, m, host_to_device, sync = .false.)
         call device_memcpy(bla_y, blay_d, m, host_to_device, sync = .false.)
         call device_memcpy(bla_z, blaz_d, m, host_to_device, sync = .true.)
 
         deallocate(bla_x, bla_y, bla_z)
      end if
      !$omp end single
 
      if (strong_ .and. this%msk(0) .gt. 0) then
         call device_inhom_dirichlet_apply_vector(this%msk_d, x_d, y_d, z_d, &
              blax_d, blay_d, blaz_d, m, strm)
      end if
 
    end associate
 
  end subroutine blasius_apply_vector_dev
 
  subroutine blasius_set_params(this, uinf, delta, type)
    class(blasius_t), intent(inout) :: this
    real(kind=rp), intent(in) :: uinf(3)
    real(kind=rp), intent(in) :: delta
    character(len=*) :: type
    this%delta = delta
    this%uinf = uinf
 
    select case (trim(type))
    case ('linear')
       this%bla => blasius_linear
    case ('quadratic')
       this%bla => blasius_quadratic
    case ('cubic')
       this%bla => blasius_cubic
    case ('quartic')
       this%bla => blasius_quartic
    case ('sin')
       this%bla => blasius_sin
    case ('tanh')
       this%bla => blasius_tanh
    case default
       call neko_error('Invalid Blasius approximation')
    end select
  end subroutine blasius_set_params
 
  subroutine blasius_finalize(this, only_facets)
    class(blasius_t), target, intent(inout) :: this
    logical, optional, intent(in) :: only_facets
    logical :: only_facets_
 
    if (present(only_facets)) then
       only_facets_ = only_facets
    else
       only_facets_ = .false.
    end if
 
    call this%finalize_base(only_facets_)
  end subroutine blasius_finalize
end module blasius