boussinesq_source_term.f90

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module boussinesq_source_term
  use num_types, only : rp
  use field_list, only : field_list_t
  use field, only : field_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 boussinesq_source_term_cpu, only : boussinesq_source_term_compute_cpu
  use boussinesq_source_term_device, only : &
       boussinesq_source_term_compute_device
  use field_registry, only : neko_field_registry
  implicit none
  private
 
  type, public, extends(source_term_t) :: boussinesq_source_term_t
     type(field_t), pointer :: s => null()
     real(kind=rp) :: ref_value = 0
     real(kind=rp) :: g(3)
     real(kind=rp) :: beta
   contains
     procedure, pass(this) :: init => boussinesq_source_term_init_from_json
     procedure, pass(this) :: init_from_compenents => &
       boussinesq_source_term_init_from_components
     procedure, pass(this) :: free => boussinesq_source_term_free
     procedure, pass(this) :: compute_ => boussinesq_source_term_compute
  end type boussinesq_source_term_t
 
contains
  subroutine boussinesq_source_term_init_from_json(this, json, fields, coef)
    class(boussinesq_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), target :: coef
    real(kind=rp), allocatable :: values(:)
    real(kind=rp) :: start_time, end_time, ref_value
    character(len=:), allocatable :: scalar_name
    real(kind=rp), allocatable :: g(:)
    real(kind=rp) :: beta
 
    if (.not. fields%size() == 3) then
       call neko_error("Boussinesq term expects 3 fields to work on.")
    end if
 
    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))
 
    call json_get_or_default(json, "scalar_field", scalar_name, "s")
    call json_get(json, "g", g)
 
    if (.not. size(g) == 3) then
       call neko_error("The gravity vector should have 3 components")
    end if
 
    call json_get(json, "reference_value", ref_value)
    call json_get_or_default(json, "beta", beta, 1.0_rp/ref_value)
 
    call boussinesq_source_term_init_from_components(this, fields, scalar_name,&
       ref_value, g, beta, coef, start_time, end_time)
 
  end subroutine boussinesq_source_term_init_from_json
 
  subroutine boussinesq_source_term_init_from_components(this, fields, &
    scalar_name, ref_value, g, beta, coef, start_time, end_time)
    class(boussinesq_source_term_t), intent(inout) :: this
    class(field_list_t), intent(inout), target :: fields
    character(len=*), intent(in) :: scalar_name
    real(kind=rp), intent(in) :: ref_value
    real(kind=rp), intent(in) :: g(3)
    real(kind=rp), intent(in) :: beta
    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 (.not. neko_field_registry%field_exists(scalar_name)) then
       call neko_field_registry%add_field(this%fields%dof(1), "s")
    end if
    this%s => neko_field_registry%get_field("s")
 
    this%ref_value = ref_value
    this%g = g
    this%beta = beta
  end subroutine boussinesq_source_term_init_from_components
 
  subroutine boussinesq_source_term_free(this)
    class(boussinesq_source_term_t), intent(inout) :: this
 
    call this%free_base()
    nullify(this%s)
  end subroutine boussinesq_source_term_free
 
  subroutine boussinesq_source_term_compute(this, t, tstep)
    class(boussinesq_source_term_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
    integer :: n_fields, i, n
 
    n_fields = this%fields%size()
    n = this%fields%item_size(1)
 
    if (neko_bcknd_device .eq. 1) then
       call boussinesq_source_term_compute_device(this%fields, this%s,&
         this%ref_value, this%g, this%beta)
    else
       call boussinesq_source_term_compute_cpu(this%fields, this%s,&
         this%ref_value, this%g, this%beta)
    end if
  end subroutine boussinesq_source_term_compute
 
end module boussinesq_source_term