sigma_device.f90

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module sigma_device
  use num_types, only : rp
  use field_list, only : field_list_t
  use device_math, only : device_col2
  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_sigma_nut, only : device_sigma_nut_compute
  implicit none
  private
 
  public :: sigma_compute_device
 
contains
 
  subroutine sigma_compute_device(t, tstep, coef, nut, delta, c)
    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 velocity gradient tensor
    type(field_t), pointer :: g11, g12, g13, g21, g22, g23, g31, g32, g33
    type(field_t), pointer :: u, v, w
 
    real(kind=rp) :: pi_3 = 4.0_rp/3.0_rp*atan(1.0_rp)
    real(kind=rp) :: eps
 
    integer :: temp_indices(9)
    integer :: e, i
 
    ! some constant
    eps = 1.0_rp-14
 
    ! get fields from registry
    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")
 
    call neko_scratch_registry%request_field(g11, temp_indices(1))
    call neko_scratch_registry%request_field(g12, temp_indices(2))
    call neko_scratch_registry%request_field(g13, temp_indices(3))
    call neko_scratch_registry%request_field(g21, temp_indices(4))
    call neko_scratch_registry%request_field(g22, temp_indices(5))
    call neko_scratch_registry%request_field(g23, temp_indices(6))
    call neko_scratch_registry%request_field(g31, temp_indices(7))
    call neko_scratch_registry%request_field(g32, temp_indices(8))
    call neko_scratch_registry%request_field(g33, temp_indices(9))
 
    ! Compute the derivatives of the velocity (the components of the g tensor)
    call dudxyz(g11%x, u%x, coef%drdx, coef%dsdx, coef%dtdx, coef)
    call dudxyz(g12%x, u%x, coef%drdy, coef%dsdy, coef%dtdy, coef)
    call dudxyz(g13%x, u%x, coef%drdz, coef%dsdz, coef%dtdz, coef)
 
    call dudxyz(g21%x, v%x, coef%drdx, coef%dsdx, coef%dtdx, coef)
    call dudxyz(g22%x, v%x, coef%drdy, coef%dsdy, coef%dtdy, coef)
    call dudxyz(g23%x, v%x, coef%drdz, coef%dsdz, coef%dtdz, coef)
 
    call dudxyz(g31%x, w%x, coef%drdx, coef%dsdx, coef%dtdx, coef)
    call dudxyz(g32%x, w%x, coef%drdy, coef%dsdy, coef%dtdy, coef)
    call dudxyz(g33%x, w%x, coef%drdz, coef%dsdz, coef%dtdz, coef)
 
    call coef%gs_h%op(g11, gs_op_add)
    call coef%gs_h%op(g12, gs_op_add)
    call coef%gs_h%op(g13, gs_op_add)
    call coef%gs_h%op(g21, gs_op_add)
    call coef%gs_h%op(g22, gs_op_add)
    call coef%gs_h%op(g23, gs_op_add)
    call coef%gs_h%op(g31, gs_op_add)
    call coef%gs_h%op(g32, gs_op_add)
    call coef%gs_h%op(g33, gs_op_add)
 
    call device_sigma_nut_compute(g11%x_d, g12%x_d, g13%x_d, &
                                  g21%x_d, g22%x_d, g23%x_d, &
                                  g31%x_d, g32%x_d, g33%x_d, &
                                  delta%x_d, nut%x_d, coef%mult_d, &
                                  c, eps, g11%dof%size())
 
    call neko_scratch_registry%relinquish_field(temp_indices)
  end subroutine sigma_compute_device
end module sigma_device