field_writer.f90

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module field_writer
  use num_types, only : rp, dp, sp
  use json_module, only : json_file
  use simulation_component, only : simulation_component_t
  use field_registry, only : neko_field_registry
  use case, only : case_t
  use fld_file_output, only : fld_file_output_t
  use json_utils, only : json_get
  implicit none
  private
 
  type, public, extends(simulation_component_t) :: field_writer_t
     type(fld_file_output_t), private :: output
 
   contains
     procedure, pass(this) :: init => field_writer_init_from_json
     procedure, pass(this) :: init_from_attributes => &
        field_writer_init_from_attributes
     procedure, pass(this) :: free => field_writer_free
     procedure, pass(this) :: compute_ => field_writer_compute
  end type field_writer_t
 
contains
 
  subroutine field_writer_init_from_json(this, json, case)
    class(field_writer_t), intent(inout) :: this
    type(json_file), intent(inout) :: json
    class(case_t), intent(inout), target :: case
    character(len=:), allocatable :: filename
    character(len=:), allocatable :: precision
    character(len=20), allocatable :: fields(:)
 
    call this%init_base(json, case)
    call json_get(json, "fields", fields)
 
    if (json%valid_path("output_filename")) then
       call json_get(json, "output_filename", filename)
       if (json%valid_path("output_precision")) then
           call json_get(json, "output_precision", precision)
           if (precision == "double") then
              call field_writer_init_from_attributes(this, fields, filename, dp)
           else
              call field_writer_init_from_attributes(this, fields, filename, sp)
           end if
       else
           call field_writer_init_from_attributes(this, fields, filename)
       end if
    else
       call field_writer_init_from_attributes(this, fields)
    end if
  end subroutine field_writer_init_from_json
 
  subroutine field_writer_init_from_attributes(this, fields, filename, precision)
    class(field_writer_t), intent(inout) :: this
    character(len=20), allocatable, intent(in) :: fields(:)
    character(len=*), intent(in), optional :: filename
    integer, intent(in), optional :: precision
    character(len=20) :: fieldi
    integer :: i
 
    ! Regsiter fields if they don't exist.
    do i=1, size(fields)
      fieldi = trim(fields(i))
      call neko_field_registry%add_field(this%case%fluid%dm_Xh, fieldi,&
                                         ignore_existing=.true.)
    end do
 
    if (present(filename)) then
       if (present(precision)) then
          call this%output%init(precision, filename, size(fields))
       else
          call this%output%init(sp, filename, size(fields))
       end if
       do i=1, size(fields)
          fieldi = trim(fields(i))
          call this%output%fields%assign(i, neko_field_registry%get_field(fieldi))
       end do
 
       call this%case%output_controller%add(this%output, &
            this%output_controller%control_value, &
            this%output_controller%control_mode)
    else
      do i=1, size(fields)
         fieldi = trim(fields(i))
         call this%case%f_out%fluid%append(neko_field_registry%get_field(fieldi))
      end do
    end if
 
  end subroutine field_writer_init_from_attributes
 
  subroutine field_writer_free(this)
    class(field_writer_t), intent(inout) :: this
    call this%free_base()
  end subroutine field_writer_free
 
  subroutine field_writer_compute(this, t, tstep)
    class(field_writer_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
 
  end subroutine field_writer_compute
 
end module field_writer