sigma.f90

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module sigma
  use num_types, only : rp
  use field, only : field_t
  use fluid_scheme_base, only : fluid_scheme_base_t
  use les_model, only : les_model_t
  use json_utils, only : json_get_or_default
  use json_module, only : json_file
  use neko_config, only : neko_bcknd_device
  use sigma_cpu, only : sigma_compute_cpu
  use sigma_device, only : sigma_compute_device
  use field_registry, only : neko_field_registry
  use logger, only : log_size, neko_log
  implicit none
  private
 
  type, public, extends(les_model_t) :: sigma_t
     real(kind=rp) :: c
   contains
     procedure, pass(this) :: init => sigma_init
     procedure, pass(this) :: init_from_components &
          => sigma_init_from_components
     procedure, pass(this) :: free => sigma_free
     procedure, pass(this) :: compute => sigma_compute
  end type sigma_t
  type, public, extends(les_model_t) :: sigma_t …
 
contains
  subroutine sigma_init(this, fluid, json)
    class(sigma_t), intent(inout) :: this
    class(fluid_scheme_base_t), intent(inout), target :: fluid
    type(json_file), intent(inout) :: json
    character(len=:), allocatable :: nut_name
    real(kind=rp) :: c
    character(len=:), allocatable :: delta_type
    logical :: if_ext
    character(len=LOG_SIZE) :: log_buf
 
    call json_get_or_default(json, "nut_field", nut_name, "nut")
    call json_get_or_default(json, "delta_type", delta_type, "pointwise")
    ! Based on  C = 1.35 as default values
    call json_get_or_default(json, "c", c, 1.35_rp)
    call json_get_or_default(json, "extrapolation", if_ext, .true.)
 
    call neko_log%section('LES model')
    write(log_buf, '(A)') 'Model : Sigma'
    call neko_log%message(log_buf)
    write(log_buf, '(A, A)') 'Delta evaluation : ', delta_type
    call neko_log%message(log_buf)
    write(log_buf, '(A, E15.7)') 'c : ', c
    call neko_log%message(log_buf)
    write(log_buf, '(A, L1)') 'extrapolation : ', if_ext
    call neko_log%message(log_buf)
    call neko_log%end_section()
 
    call sigma_init_from_components(this, fluid, c, nut_name, delta_type, &
         if_ext)
  subroutine sigma_init(this, fluid, json) …
  end subroutine sigma_init
 
  subroutine sigma_init_from_components(this, fluid, c, nut_name, &
       delta_type, if_ext)
    class(sigma_t), intent(inout) :: this
    class(fluid_scheme_base_t), intent(inout), target :: fluid
    real(kind=rp) :: c
    character(len=*), intent(in) :: nut_name
    character(len=*), intent(in) :: delta_type
    logical, intent(in) :: if_ext
 
    call this%free()
 
    call this%init_base(fluid, nut_name, delta_type, if_ext)
 
    this%c = c
 
  subroutine sigma_init_from_components(this, fluid, c, nut_name, & …
  end subroutine sigma_init_from_components
 
  subroutine sigma_free(this)
    class(sigma_t), intent(inout) :: this
 
    call this%free_base()
  subroutine sigma_free(this) …
  end subroutine sigma_free
 
  subroutine sigma_compute(this, t, tstep)
    class(sigma_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
 
    type(field_t), pointer :: u, v, w, u_e, v_e, w_e
 
    if (this%if_ext .eqv. .true.) then
       ! Extrapolate the velocity fields
       associate(ulag => this%ulag, vlag => this%vlag, &
            wlag => this%wlag, ext_bdf => this%ext_bdf)
 
         u => neko_field_registry%get_field_by_name("u")
         v => neko_field_registry%get_field_by_name("v")
         w => neko_field_registry%get_field_by_name("w")
         u_e => neko_field_registry%get_field_by_name("u_e")
         v_e => neko_field_registry%get_field_by_name("v_e")
         w_e => neko_field_registry%get_field_by_name("w_e")
 
         call this%sumab%compute_fluid(u_e, v_e, w_e, u, v, w, &
              ulag, vlag, wlag, ext_bdf%advection_coeffs, ext_bdf%nadv)
 
       end associate
    end if
 
    ! Compute the eddy viscosity field
    if (neko_bcknd_device .eq. 1) then
       call sigma_compute_device(this%if_ext, t, tstep, this%coef, &
            this%nut, this%delta, this%c)
    else
       call sigma_compute_cpu(this%if_ext, t, tstep, this%coef, &
            this%nut, this%delta, this%c)
    end if
 
  subroutine sigma_compute(this, t, tstep) …
  end subroutine sigma_compute
 
end module sigma