fluid_user_source_term.f90

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module fluid_user_source_term
  use neko_config, only : neko_bcknd_device
  use num_types, only : rp
  use utils, only : neko_error
  use source_term, only : source_term_t
  use json_module, only : json_file
  use field_list, only : field_list_t
  use coefs, only : coef_t
  use device, only : device_map, device_free
  use device_math, only : device_add2
  use math, only : add2
  use dofmap, only : dofmap_t
  use, intrinsic :: iso_c_binding
  implicit none
  private
 
  public :: fluid_source_compute_pointwise, fluid_source_compute_vector
 
  type, public, extends(source_term_t) :: fluid_user_source_term_t
     type(dofmap_t), pointer :: dm
     real(kind=rp), allocatable :: u(:, :, :, :)
     real(kind=rp), allocatable :: v(:, :, :, :)
     real(kind=rp), allocatable :: w(:, :, :, :)
 
     type(c_ptr) :: u_d = c_null_ptr
     type(c_ptr) :: v_d = c_null_ptr
     type(c_ptr) :: w_d = c_null_ptr
     procedure(fluid_source_compute_pointwise), nopass, pointer :: compute_pw_ &
       => null()
     procedure(fluid_source_compute_vector), nopass, pointer :: compute_vector_&
       => null()
   contains
     procedure, pass(this) :: init => fluid_user_source_term_init
     procedure, pass(this) :: init_from_components => &
       fluid_user_source_term_init_from_components
     procedure, pass(this) :: free => fluid_user_source_term_free
     procedure, pass(this) :: compute_ => fluid_user_source_term_compute
  end type fluid_user_source_term_t
 
  abstract interface
 
     subroutine fluid_source_compute_vector(this, t)
       import fluid_user_source_term_t, rp
       class(fluid_user_source_term_t), intent(inout) :: this
       real(kind=rp), intent(in) :: t
     end subroutine fluid_source_compute_vector
  end interface
 
  abstract interface
 
     subroutine fluid_source_compute_pointwise(u, v, w, j, k, l, e, t)
       import rp
       real(kind=rp), intent(inout) :: u
       real(kind=rp), intent(inout) :: v
       real(kind=rp), intent(inout) :: w
       integer, intent(in) :: j
       integer, intent(in) :: k
       integer, intent(in) :: l
       integer, intent(in) :: e
       real(kind=rp), intent(in) :: t
     end subroutine fluid_source_compute_pointwise
  end interface
 
contains
 
  subroutine fluid_user_source_term_init(this, json, fields, coef)
    class(fluid_user_source_term_t), intent(inout) :: this
    type(json_file), intent(inout) :: json
    type(field_list_t), intent(inout), target :: fields
    type(coef_t), intent(inout) :: coef
 
    call neko_error("The user fluid source term should be init from components")
 
  end subroutine fluid_user_source_term_init
 
  subroutine fluid_user_source_term_init_from_components(this, fields, coef, &
    source_term_type, eval_vector, eval_pointwise)
    class(fluid_user_source_term_t), intent(inout) :: this
    type(field_list_t), intent(inout), target :: fields
    type(coef_t), intent(inout) :: coef
    character(len=*) :: source_term_type
    procedure(fluid_source_compute_vector), optional :: eval_vector
    procedure(fluid_source_compute_pointwise), optional :: eval_pointwise
 
    call this%free()
    call this%init_base(fields, coef, 0.0_rp, huge(0.0_rp))
 
    this%dm => fields%fields(1)%f%dof
 
    allocate(this%u(this%dm%Xh%lx, this%dm%Xh%ly, this%dm%Xh%lz, &
             this%dm%msh%nelv))
    allocate(this%v(this%dm%Xh%lx, this%dm%Xh%ly, this%dm%Xh%lz, &
             this%dm%msh%nelv))
    allocate(this%w(this%dm%Xh%lx, this%dm%Xh%ly, this%dm%Xh%lz, &
             this%dm%msh%nelv))
 
    this%u = 0d0
    this%v = 0d0
    this%w = 0d0
 
    if (neko_bcknd_device .eq. 1) then
       call device_map(this%u, this%u_d, this%dm%size())
       call device_map(this%v, this%v_d, this%dm%size())
       call device_map(this%w, this%w_d, this%dm%size())
    end if
 
 
    if (trim(source_term_type) .eq. 'user_pointwise' .and. &
              present(eval_pointwise)) then
       if (neko_bcknd_device .eq. 1) then
          call neko_error('Pointwise source terms not supported on accelerators')
       end if
       this%compute_vector_ => pointwise_eval_driver
       this%compute_pw_ => eval_pointwise
    else if (trim(source_term_type) .eq. 'user_vector' .and. &
             present(eval_vector)) then
       this%compute_vector_ => eval_vector
    else
       call neko_error('Invalid fluid source term '//source_term_type)
    end if
  end subroutine fluid_user_source_term_init_from_components
 
  subroutine fluid_user_source_term_free(this)
    class(fluid_user_source_term_t), intent(inout) :: this
 
    if (allocated(this%u)) deallocate(this%u)
    if (allocated(this%v)) deallocate(this%v)
    if (allocated(this%w)) deallocate(this%w)
 
    if (c_associated(this%u_d)) call device_free(this%u_d)
    if (c_associated(this%v_d)) call device_free(this%v_d)
    if (c_associated(this%w_d)) call device_free(this%w_d)
 
    nullify(this%compute_vector_)
    nullify(this%compute_pw_)
    nullify(this%dm)
 
    call this%free_base()
  end subroutine fluid_user_source_term_free
 
  subroutine fluid_user_source_term_compute(this, t, tstep)
    class(fluid_user_source_term_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
    integer :: n
 
    call this%compute_vector_(this, t)
    n = this%fields%fields(1)%f%dof%size()
 
    if (neko_bcknd_device .eq. 1) then
       call device_add2(this%fields%fields(1)%f%x_d, this%u_d, n)
       call device_add2(this%fields%fields(2)%f%x_d, this%v_d, n)
       call device_add2(this%fields%fields(3)%f%x_d, this%w_d, n)
    else
       call add2(this%fields%fields(1)%f%x, this%u, n)
       call add2(this%fields%fields(2)%f%x, this%v, n)
       call add2(this%fields%fields(3)%f%x, this%w, n)
    end if
 
  end subroutine fluid_user_source_term_compute
 
  subroutine pointwise_eval_driver(this, t)
    class(fluid_user_source_term_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer :: j, k, l, e
    integer :: jj, kk, ll, ee
 
    select type (this)
    type is (fluid_user_source_term_t)
       do e = 1, size(this%u, 4)
          ee = e
          do l = 1, size(this%u, 3)
             ll = l
             do k = 1, size(this%u, 2)
                kk = k
                do j = 1, size(this%u, 1)
                   jj =j
                   call this%compute_pw_(this%u(j,k,l,e), &
                                        this%v(j,k,l,e), &
                                        this%w(j,k,l,e), &
                                        jj, kk, ll, ee, t)
                end do
             end do
          end do
       end do
    class default
       call neko_error('Incorrect source type in pointwise eval driver!')
    end select
 
  end subroutine pointwise_eval_driver
 
end module fluid_user_source_term