fluid_sgs_stats.f90

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module fluid_sgs_stats
  use mean_field, only : mean_field_t
  use num_types, only : rp
  use field_math, only : field_cmult
  use operators, only : strain_rate
  use coefs, only : coef_t
  use field, only : field_t
  use field_list, only : field_list_t
  use stats_quant, only : stats_quant_t
  use registry, only : neko_registry
  use scratch_registry, only : neko_scratch_registry
  implicit none
  private
 
  type, public, extends(stats_quant_t) :: fluid_sgs_stats_t
     type(field_t), pointer :: nut
     type(field_t), pointer :: u
     type(field_t), pointer :: v
     type(field_t), pointer :: w
 
     type(mean_field_t) :: nut_mean
 
     type(mean_field_t) :: uu_sgs
     type(mean_field_t) :: vv_sgs
     type(mean_field_t) :: ww_sgs
     type(mean_field_t) :: uv_sgs
     type(mean_field_t) :: uw_sgs
     type(mean_field_t) :: vw_sgs
 
     type(coef_t), pointer :: coef
 
     integer :: n_stats = 7
 
     type(field_list_t) :: stat_fields
   contains
     procedure, pass(this) :: init => fluid_sgs_stats_init
     procedure, pass(this) :: free => fluid_sgs_stats_free
     procedure, pass(this) :: update => fluid_sgs_stats_update
     procedure, pass(this) :: reset => fluid_sgs_stats_reset
  end type fluid_sgs_stats_t
 
contains
 
  subroutine fluid_sgs_stats_init(this, coef, u, v, w, nut_field)
    class(fluid_sgs_stats_t), intent(inout), target:: this
    type(coef_t), target :: coef
    type(field_t), target, intent(in) :: u, v, w
    character(*), intent(in), optional :: nut_field
 
    call this%free()
    this%coef => coef
 
    this%u => u
    this%v => v
    this%w => w
 
    if (present(nut_field)) then
       this%nut => neko_registry%get_field_by_name(trim(nut_field))
    else
       this%nut => neko_registry%get_field_by_name('nut')
    end if
 
 
    ! Initialize mean fields. The SGS stresses are means of products, updated
    ! with update_col3. The field passed to init only provides the dofmap.
    call this%nut_mean%init(this%nut)
 
    call this%uu_sgs%init(this%nut, 'uu_sgs')
    call this%vv_sgs%init(this%nut, 'vv_sgs')
    call this%ww_sgs%init(this%nut, 'ww_sgs')
    call this%uv_sgs%init(this%nut, 'uv_sgs')
    call this%uw_sgs%init(this%nut, 'uw_sgs')
    call this%vw_sgs%init(this%nut, 'vw_sgs')
 
    allocate(this%stat_fields%items(this%n_stats))
 
    call this%stat_fields%assign_to_field(1, this%nut_mean%mf)
 
    call this%stat_fields%assign_to_field(2, this%uu_sgs%mf)
    call this%stat_fields%assign_to_field(3, this%vv_sgs%mf)
    call this%stat_fields%assign_to_field(4, this%ww_sgs%mf)
    call this%stat_fields%assign_to_field(5, this%uv_sgs%mf)
    call this%stat_fields%assign_to_field(6, this%uw_sgs%mf)
    call this%stat_fields%assign_to_field(7, this%vw_sgs%mf)
 
  end subroutine fluid_sgs_stats_init
 
  subroutine fluid_sgs_stats_update(this, k)
    class(fluid_sgs_stats_t), intent(inout) :: this
    real(kind=rp), intent(in) :: k
    type(field_t), pointer :: s11, s22, s33
    type(field_t), pointer :: s12, s13, s23
    integer :: temp_indices(6)
 
    call neko_scratch_registry%request(s11, temp_indices(1), .false.)
    call neko_scratch_registry%request(s22, temp_indices(2), .false.)
    call neko_scratch_registry%request(s33, temp_indices(3), .false.)
    call neko_scratch_registry%request(s12, temp_indices(4), .false.)
    call neko_scratch_registry%request(s13, temp_indices(5), .false.)
    call neko_scratch_registry%request(s23, temp_indices(6), .false.)
 
    call this%nut_mean%update(k)
 
    call strain_rate(s11, s22, s33, s12, s13, s23, &
         this%u, this%v, this%w, this%coef)
 
    ! form the double sij tensor
    call field_cmult(s11, 2.0_rp)
    call field_cmult(s22, 2.0_rp)
    call field_cmult(s33, 2.0_rp)
    call field_cmult(s12, 2.0_rp)
    call field_cmult(s13, 2.0_rp)
    call field_cmult(s23, 2.0_rp)
 
    call this%uu_sgs%update_col3(k, this%nut, s11)
    call this%vv_sgs%update_col3(k, this%nut, s22)
    call this%ww_sgs%update_col3(k, this%nut, s33)
    call this%uv_sgs%update_col3(k, this%nut, s12)
    call this%uw_sgs%update_col3(k, this%nut, s13)
    call this%vw_sgs%update_col3(k, this%nut, s23)
 
    call neko_scratch_registry%relinquish_field(temp_indices)
  end subroutine fluid_sgs_stats_update
 
 
  subroutine fluid_sgs_stats_free(this)
    class(fluid_sgs_stats_t), intent(inout) :: this
 
    call this%nut_mean%free()
 
    call this%uu_sgs%free()
    call this%vv_sgs%free()
    call this%ww_sgs%free()
    call this%uv_sgs%free()
    call this%uw_sgs%free()
    call this%vw_sgs%free()
 
    nullify(this%coef)
    nullify(this%u)
    nullify(this%v)
    nullify(this%w)
    nullify(this%nut)
 
    call this%stat_fields%free()
 
  end subroutine fluid_sgs_stats_free
 
  subroutine fluid_sgs_stats_reset(this)
    class(fluid_sgs_stats_t), intent(inout), target:: this
 
    call this%nut_mean%reset()
 
    call this%uu_sgs%reset()
    call this%vv_sgs%reset()
    call this%ww_sgs%reset()
    call this%uv_sgs%reset()
    call this%uw_sgs%reset()
    call this%vw_sgs%reset()
 
  end subroutine fluid_sgs_stats_reset
 
end module fluid_sgs_stats