fluid_output.f90

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module fluid_output
  use num_types, only : rp
  use fluid_scheme_incompressible, only : fluid_scheme_incompressible_t
  use fluid_scheme_compressible, only : fluid_scheme_compressible_t
  use fluid_scheme_base, only : fluid_scheme_base_t
  use scalar_scheme, only : scalar_scheme_t
  use field_list, only : field_list_t
  use neko_config, only : neko_bcknd_device
  use device
  use output, only : output_t
  use scalars, only : scalars_t
  use registry, only : neko_registry
  use field, only : field_t
  use fld_file, only : fld_file_t
  implicit none
  private
 
  type, public, extends(output_t) :: fluid_output_t
     type(field_list_t) :: fluid
     logical :: always_write_mesh = .false.
   contains
     procedure, pass(this) :: init => fluid_output_init
     procedure, pass(this) :: sample => fluid_output_sample
     procedure, pass(this) :: free => fluid_output_free
  end type fluid_output_t
 
contains
 
  subroutine fluid_output_init(this, precision, fluid, scalar_fields, name, &
       path, fmt, layout, always_write_mesh)
    class(fluid_output_t), intent(inout) :: this
    integer, intent(inout) :: precision
    class(fluid_scheme_base_t), intent(in), target :: fluid
    class(scalars_t), intent(in), optional, target :: scalar_fields
    character(len=*), intent(in), optional :: name
    character(len=*), intent(in), optional :: path
    character(len=*), intent(in), optional :: fmt
    logical, intent(in), optional :: always_write_mesh
    integer, intent(in), optional :: layout
    character(len=1024) :: fname
    integer :: i, j, n_scalars
    character(len=10) :: suffix
    logical :: has_max_wave_speed, has_density
    type(field_t), pointer :: max_wave_speed_field
 
    suffix = '.fld'
    if (present(fmt)) then
       if (fmt .eq. 'adios2') then
          suffix = '.bp'
       else if (fmt .eq. 'vtkhdf') then
          suffix = '.vtkhdf'
       end if
    end if
 
    if (present(always_write_mesh)) then
       this%always_write_mesh = always_write_mesh
    end if
 
    if (present(name) .and. present(path)) then
       fname = trim(path) // trim(name) // trim(suffix)
    else if (present(name)) then
       fname = trim(name) // trim(suffix)
    else if (present(path)) then
       fname = trim(path) // 'field' // trim(suffix)
    else
       fname = 'field' // trim(suffix)
    end if
 
    if (present(layout)) then
       call this%init_base(fname, precision, layout)
    else
       call this%init_base(fname, precision)
    end if
 
    ! Calculate total number of fields
    n_scalars = 0
    if (present(scalar_fields)) then
       n_scalars = size(scalar_fields%scalar_fields)
    end if
 
    ! Check if max_wave_speed field exists (for compressible flows)
    has_max_wave_speed = neko_registry%field_exists("max_wave_speed")
 
    ! Check if density field exists (for compressible flows)
    ! We need to check the solver type here since the incompressible
    ! solver also has a rho field due to the material properties
    select type (fluid)
    class is (fluid_scheme_compressible_t)
       has_density = associated(fluid%rho)
    class default
       has_density = .false.
    end select
 
    ! Initialize field list with appropriate size
    ! Standard fields: p, u, v, w (4)
    ! Scalar fields: n_scalars
    ! Compressible fields: density + max_wave_speed (2 additional)
    i = 4
 
    if (has_density) then
       i = i + 1
    end if
 
    if (has_max_wave_speed) then
       i = i + 1
    end if
 
    call this%fluid%init(i + n_scalars)
 
    call this%fluid%assign(1, fluid%p)
    call this%fluid%assign(2, fluid%u)
    call this%fluid%assign(3, fluid%v)
    call this%fluid%assign(4, fluid%w)
 
    ! Assign all scalar fields first
    i = 4
    if (present(scalar_fields)) then
       do j = 1, n_scalars
          i = i + 1
          call this%fluid%assign(i, scalar_fields%scalar_fields(j)%scalar%s)
       end do
    end if
 
    ! Add density field if it exists (for compressible flows)
    if (has_density) then
       i = i + 1
       call this%fluid%assign(i, fluid%rho)
    end if
 
    ! Add max_wave_speed field if it exists (for compressible flows)
    if (has_max_wave_speed) then
       i = i + 1
       max_wave_speed_field => neko_registry%get_field("max_wave_speed")
       call this%fluid%assign(i, max_wave_speed_field)
    end if
 
  end subroutine fluid_output_init
 
  subroutine fluid_output_free(this)
    class(fluid_output_t), intent(inout) :: this
 
    call this%free_base()
    call this%fluid%free()
 
  end subroutine fluid_output_free
 
  subroutine fluid_output_sample(this, t)
    class(fluid_output_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer :: i
 
    if (neko_bcknd_device .eq. 1) then
 
       associate(fields => this%fluid%items)
         do i = 1, size(fields)
            call device_memcpy(fields(i)%ptr%x, fields(i)%ptr%x_d, &
                 fields(i)%ptr%dof%size(), device_to_host, &
                 sync = (i .eq. size(fields))) ! Sync on the last field
         end do
       end associate
 
    end if
 
    select type (ft => this%file_%file_type)
       ! Only fld files have the option to write the mesh at command
    type is (fld_file_t)
       ft%write_mesh = this%always_write_mesh
       call ft%write(this%fluid, t)
    class default
       call ft%write(this%fluid, t)
    end select
 
  end subroutine fluid_output_sample
 
end module fluid_output