les_model.f90

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module les_model
  use num_types, only : rp
  use field, only : field_t, field_ptr_t
  use json_module, only : json_file
  use field_registry, only : neko_field_registry
  use dofmap, only : dofmap_t
  use coefs, only : coef_t
  use gs_ops, only : gs_op_add
  use neko_config, only : neko_bcknd_device
  use device, only : device_memcpy, host_to_device
  use math, only : col2
  use device_math, only : device_col2
  implicit none
  private
 
  type, abstract, public :: les_model_t
     type(field_t), pointer :: nut => null()
     character(len=:), allocatable :: delta_type
     type(field_t), pointer :: delta => null()
     type(coef_t), pointer :: coef => null()
   contains
     procedure, pass(this) :: init_base => les_model_init_base
     procedure, pass(this) :: free_base => les_model_free_base
     procedure, pass(this) :: compute_delta => les_model_compute_delta
     procedure(les_model_init), pass(this), deferred :: init
     procedure(les_model_free), pass(this), deferred :: free
     procedure(les_model_compute), pass(this), deferred :: compute
  end type les_model_t
 
  abstract interface
 
     subroutine les_model_compute(this, t, tstep)
       import les_model_t, rp
       class(les_model_t), intent(inout) :: this
       real(kind=rp), intent(in) :: t
       integer, intent(in) :: tstep
     end subroutine les_model_compute
  end interface
 
  abstract interface
 
     subroutine les_model_init(this, dofmap, coef, json)
       import les_model_t, json_file, dofmap_t, coef_t
       class(les_model_t), intent(inout) :: this
       type(coef_t), intent(in) :: coef
       type(dofmap_t), intent(in) :: dofmap
       type(json_file), intent(inout) :: json
     end subroutine les_model_init
  end interface
 
  abstract interface
 
     subroutine les_model_free(this)
       import les_model_t
       class(les_model_t), intent(inout) :: this
     end subroutine les_model_free
  end interface
 
  interface
 
     module subroutine les_model_factory(object, type_name, dofmap, coef, json)
       class(les_model_t), allocatable, intent(inout) :: object
       character(len=*), intent(in) :: type_name
       type(dofmap_t), intent(in) :: dofmap
       type(coef_t), intent(in) :: coef
       type(json_file), intent(inout) :: json
     end subroutine les_model_factory
  end interface
 
  public :: les_model_factory
  
contains
  subroutine les_model_init_base(this, dofmap, coef, nut_name, delta_type)
    class(les_model_t), intent(inout) :: this
    type(dofmap_t), intent(in) :: dofmap
    type(coef_t), target, intent(in) :: coef
    character(len=*), intent(in) :: nut_name
    character(len=*), intent(in) :: delta_type
 
    if (.not. neko_field_registry%field_exists(trim(nut_name))) then
       call neko_field_registry%add_field(dofmap, trim(nut_name))
    end if
    if (.not. neko_field_registry%field_exists("les_delta")) then
       call neko_field_registry%add_field(dofmap, "les_delta")
    end if
    this%nut => neko_field_registry%get_field(trim(nut_name))
    this%delta => neko_field_registry%get_field("les_delta")
    this%coef => coef
    this%delta_type = delta_type
 
    call this%compute_delta()
  end subroutine les_model_init_base
 
  subroutine les_model_free_base(this)
    class(les_model_t), intent(inout) :: this
 
    nullify(this%nut)
    nullify(this%delta)
    nullify(this%coef)
  end subroutine les_model_free_base
 
  subroutine les_model_compute_delta(this)
    class(les_model_t), intent(inout) :: this
    integer :: e, i, j, k
    integer :: im, ip, jm, jp, km, kp
    real(kind=rp) :: di, dj, dk, ndim_inv
    integer :: lx_half, ly_half, lz_half
 
    lx_half = this%coef%Xh%lx / 2
    ly_half = this%coef%Xh%ly / 2
    lz_half = this%coef%Xh%lz / 2
 
    if (this%delta_type .eq. "elementwise") then
       ! use a same length scale throughout an entire element
       ! the length scale is based on maximum GLL spacing
       do e = 1, this%coef%msh%nelv
          di = (this%coef%dof%x(lx_half, 1, 1, e) &
              - this%coef%dof%x(lx_half + 1, 1, 1, e))**2 &
             + (this%coef%dof%y(lx_half, 1, 1, e) &
              - this%coef%dof%y(lx_half + 1, 1, 1, e))**2 &
             + (this%coef%dof%z(lx_half, 1, 1, e) &
              - this%coef%dof%z(lx_half + 1, 1, 1, e))**2
 
          dj = (this%coef%dof%x(1, ly_half, 1, e) &
              - this%coef%dof%x(1, ly_half + 1, 1, e))**2 &
             + (this%coef%dof%y(1, ly_half, 1, e) &
              - this%coef%dof%y(1, ly_half + 1, 1, e))**2 &
             + (this%coef%dof%z(1, ly_half, 1, e) &
              - this%coef%dof%z(1, ly_half + 1, 1, e))**2
 
          dk = (this%coef%dof%x(1, 1, lz_half, e) &
              - this%coef%dof%x(1, 1, lz_half + 1, e))**2 &
             + (this%coef%dof%y(1, 1, lz_half, e) &
              - this%coef%dof%y(1, 1, lz_half + 1, e))**2 &
             + (this%coef%dof%z(1, 1, lz_half, e) &
              - this%coef%dof%z(1, 1, lz_half + 1, e))**2
          di = sqrt(di)
          dj = sqrt(dj)
          dk = sqrt(dk)
          this%delta%x(:,:,:,e) = (di * dj * dk)**(1.0_rp / 3.0_rp)
       end do
 
    else if (this%delta_type .eq. "pointwise") then
       do e = 1, this%coef%msh%nelv
          do k = 1, this%coef%Xh%lz
             km = max(1, k-1)
             kp = min(this%coef%Xh%lz, k+1)
 
             do j = 1, this%coef%Xh%ly
                jm = max(1, j-1)
                jp = min(this%coef%Xh%ly, j+1)
 
                do i = 1, this%coef%Xh%lx
                   im = max(1, i-1)
                   ip = min(this%coef%Xh%lx, i+1)
 
                   di = (this%coef%dof%x(ip, j, k, e) - &
                         this%coef%dof%x(im, j, k, e))**2 &
                      + (this%coef%dof%y(ip, j, k, e) - &
                         this%coef%dof%y(im, j, k, e))**2 &
                      + (this%coef%dof%z(ip, j, k, e) - &
                         this%coef%dof%z(im, j, k, e))**2
 
                   dj = (this%coef%dof%x(i, jp, k, e) - &
                         this%coef%dof%x(i, jm, k, e))**2 &
                      + (this%coef%dof%y(i, jp, k, e) - &
                         this%coef%dof%y(i, jm, k, e))**2 &
                      + (this%coef%dof%z(i, jp, k, e) - &
                         this%coef%dof%z(i, jm, k, e))**2
 
                   dk = (this%coef%dof%x(i, j, kp, e) - &
                         this%coef%dof%x(i, j, km, e))**2 &
                      + (this%coef%dof%y(i, j, kp, e) - &
                         this%coef%dof%y(i, j, km, e))**2 &
                      + (this%coef%dof%z(i, j, kp, e) - &
                         this%coef%dof%z(i, j, km, e))**2
 
                   di = sqrt(di) / (ip - im)
                   dj = sqrt(dj) / (jp - jm)
                   dk = sqrt(dk) / (kp - km)
                   this%delta%x(i,j,k,e) = (di * dj * dk)**(1.0_rp / 3.0_rp)
 
                end do
             end do
          end do
       end do
    end if
 
    if (neko_bcknd_device .eq. 1) then
      call device_memcpy(this%delta%x, this%delta%x_d, this%delta%dof%size(),&
                          host_to_device, sync = .false.)
      call this%coef%gs_h%op(this%delta%x, this%delta%dof%size(), gs_op_add)
      call device_col2(this%delta%x_d, this%coef%mult_d, this%delta%dof%size())
    else
      call this%coef%gs_h%op(this%delta%x, this%delta%dof%size(), gs_op_add)
      call col2(this%delta%x, this%coef%mult, this%delta%dof%size())
    end if
 
  end subroutine les_model_compute_delta
 
end module les_model