coriolis_source_term.f90

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module coriolis_source_term
  use num_types, only : rp
  use field_list, only : field_list_t
  use json_module, only : json_file
  use json_utils, only: json_get, json_get_or_default
  use source_term, only : source_term_t
  use coefs, only : coef_t
  use neko_config, only : neko_bcknd_device
  use utils, only : neko_error
  use coriolis_source_term_cpu, only : coriolis_source_term_compute_cpu
  implicit none
  private
 
  type, public, extends(source_term_t) :: coriolis_source_term_t
     real(kind=rp) :: omega(3)
     real(kind=rp) :: u_geo(3) = 0
   contains
     procedure, pass(this) :: init => coriolis_source_term_init_from_json
     procedure, pass(this) :: init_from_compenents => &
       coriolis_source_term_init_from_components
     procedure, pass(this) :: free => coriolis_source_term_free
     procedure, pass(this) :: compute_ => coriolis_source_term_compute
  end type coriolis_source_term_t
 
contains
  subroutine coriolis_source_term_init_from_json(this, json, fields, coef)
    class(coriolis_source_term_t), intent(inout) :: this
    type(json_file), intent(inout) :: json
    type(field_list_t), intent(in), target :: fields
    type(coef_t), intent(in), target :: coef
    ! Rotation vector and geostrophic wind
    real(kind=rp), allocatable :: rotation_vec(:), u_geo(:)
    ! Alternative parameters to set the rotation vector
    real(kind=rp) :: omega, phi, f, pi
    real(kind=rp) :: start_time, end_time
 
    call json_get_or_default(json, "start_time", start_time, 0.0_rp)
    call json_get_or_default(json, "end_time", end_time, huge(0.0_rp))
 
    if (json%valid_path("geostrophic_wind")) then
       call json_get(json, "geostrophic_wind", u_geo)
    else
       allocate(u_geo(3))
       u_geo = 0.0_rp
    end if
 
    if (json%valid_path("rotation_vector")) then
       call json_get(json, "rotation_vector", rotation_vec)
    else if (json%valid_path("omega") .and. json%valid_path("phi")) then
       call json_get(json, "phi", phi)
       call json_get(json, "omega", omega)
 
       allocate(rotation_vec(3))
       pi = 4 * atan(1.0_rp)
       rotation_vec(1) = 0.0_rp
       rotation_vec(2) = omega * cos(phi * pi / 180 )
       rotation_vec(3) = omega * sin(phi * pi / 180)
    else if (json%valid_path("f")) then
       call json_get(json, "f", phi)
 
       allocate(rotation_vec(3))
       rotation_vec(1) = 0.0_rp
       rotation_vec(2) = 0.0_rp
       rotation_vec(3) = 0.5_rp * f
    else
       call neko_error("Specify either rotation_vector, phi and omega, or f &
             & for the Coriolis source term.")
    end if
 
 
 
    call coriolis_source_term_init_from_components(this, fields, rotation_vec, &
          u_geo, coef, start_time, end_time)
 
  end subroutine coriolis_source_term_init_from_json
 
  subroutine coriolis_source_term_init_from_components(this, fields, omega, &
       u_geo, coef, start_time, end_time)
    class(coriolis_source_term_t), intent(inout) :: this
    class(field_list_t), intent(in), target :: fields
    real(kind=rp), intent(in) :: omega(3)
    real(kind=rp), intent(in) :: u_geo(3)
    type(coef_t) :: coef
    real(kind=rp), intent(in) :: start_time
    real(kind=rp), intent(in) :: end_time
 
    call this%free()
    call this%init_base(fields, coef, start_time, end_time)
 
    if (fields%size() .ne. 3) then
       call neko_error("Number of fields for the Coriolis force must be 3.")
    end if
 
    this%omega = omega
    this%u_geo = u_geo
  end subroutine coriolis_source_term_init_from_components
 
  subroutine coriolis_source_term_free(this)
    class(coriolis_source_term_t), intent(inout) :: this
 
    call this%free_base()
  end subroutine coriolis_source_term_free
 
  subroutine coriolis_source_term_compute(this, t, tstep)
    class(coriolis_source_term_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
 
    if (neko_bcknd_device .eq. 1) then
       call neko_error("The Coriolis force is only implemented on the CPU")
    else
       call coriolis_source_term_compute_cpu(this%fields, this%omega, &
            this%u_geo)
    end if
  end subroutine coriolis_source_term_compute
 
end module coriolis_source_term