vreman_device.f90

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module vreman_device
  use num_types, only : rp
  use math, only : neko_eps
  use scratch_registry, only : neko_scratch_registry
  use field_registry, only : neko_field_registry
  use field, only : field_t
  use operators, only : dudxyz
  use coefs, only : coef_t
  use gs_ops, only : gs_op_add
  use device_math, only : device_col2
  use device_vreman_nut, only : device_vreman_nut_compute
  implicit none
  private
 
  public :: vreman_compute_device
 
contains
 
  subroutine vreman_compute_device(if_ext, t, tstep, coef, nut, delta, c)
    logical, intent(in) :: if_ext
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
    type(coef_t), intent(in) :: coef
    type(field_t), intent(inout) :: nut
    type(field_t), intent(in) :: delta
    real(kind=rp), intent(in) :: c
    ! This is the alpha tensor in the paper
    type(field_t), pointer :: a11, a12, a13, a21, a22, a23, a31, a32, a33
    type(field_t), pointer :: u, v, w
 
    type(field_t), pointer :: beta11
    type(field_t), pointer :: beta12
    type(field_t), pointer :: beta13
    type(field_t), pointer :: beta22
    type(field_t), pointer :: beta23
    type(field_t), pointer :: beta33
    type(field_t), pointer :: b_beta
    type(field_t), pointer :: aijaij
    integer :: temp_indices(9)
    integer :: e, i
 
    if (if_ext .eqv. .true.) then
       u => neko_field_registry%get_field_by_name("u_e")
       v => neko_field_registry%get_field_by_name("v_e")
       w => neko_field_registry%get_field_by_name("w_e")
    else
       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")
    end if
 
    call neko_scratch_registry%request_field(a11, temp_indices(1))
    call neko_scratch_registry%request_field(a12, temp_indices(2))
    call neko_scratch_registry%request_field(a13, temp_indices(3))
    call neko_scratch_registry%request_field(a21, temp_indices(4))
    call neko_scratch_registry%request_field(a22, temp_indices(5))
    call neko_scratch_registry%request_field(a23, temp_indices(6))
    call neko_scratch_registry%request_field(a31, temp_indices(7))
    call neko_scratch_registry%request_field(a32, temp_indices(8))
    call neko_scratch_registry%request_field(a33, temp_indices(9))
 
    ! Compute the derivatives of the velocity (the alpha tensor)
    call dudxyz (a11%x, u%x, coef%drdx, coef%dsdx, coef%dtdx, coef)
    call dudxyz (a12%x, u%x, coef%drdy, coef%dsdy, coef%dtdy, coef)
    call dudxyz (a13%x, u%x, coef%drdz, coef%dsdz, coef%dtdz, coef)
 
    call dudxyz (a21%x, v%x, coef%drdx, coef%dsdx, coef%dtdx, coef)
    call dudxyz (a22%x, v%x, coef%drdy, coef%dsdy, coef%dtdy, coef)
    call dudxyz (a23%x, v%x, coef%drdz, coef%dsdz, coef%dtdz, coef)
 
    call dudxyz (a31%x, w%x, coef%drdx, coef%dsdx, coef%dtdx, coef)
    call dudxyz (a32%x, w%x, coef%drdy, coef%dsdy, coef%dtdy, coef)
    call dudxyz (a33%x, w%x, coef%drdz, coef%dsdz, coef%dtdz, coef)
 
    call coef%gs_h%op(a11, gs_op_add)
    call coef%gs_h%op(a12, gs_op_add)
    call coef%gs_h%op(a13, gs_op_add)
    call coef%gs_h%op(a21, gs_op_add)
    call coef%gs_h%op(a22, gs_op_add)
    call coef%gs_h%op(a23, gs_op_add)
    call coef%gs_h%op(a31, gs_op_add)
    call coef%gs_h%op(a32, gs_op_add)
    call coef%gs_h%op(a33, gs_op_add)
 
    call device_vreman_nut_compute(a11%x_d, a12%x_d, a13%x_d, &
         a21%x_d, a22%x_d, a23%x_d, &
         a31%x_d, a32%x_d, a33%x_d, &
         delta%x_d, nut%x_d, coef%mult_d, &
         c, neko_eps, a11%dof%size())
 
    call coef%gs_h%op(nut, gs_op_add)
    call device_col2(nut%x_d, coef%mult_d, nut%dof%size())
 
    call neko_scratch_registry%relinquish_field(temp_indices)
  end subroutine vreman_compute_device
 
end module vreman_device