Line data    Source code

       1           0 : // Distributed under the MIT License.
       2             : // See LICENSE.txt for details.
       3             : 
       4             : #pragma once
       5             : 
       6             : #include <cstddef>
       7             : #include <optional>
       8             : 
       9             : #include "DataStructures/DataBox/DataBox.hpp"
      10             : #include "DataStructures/DataVector.hpp"
      11             : #include "DataStructures/Tensor/EagerMath/DotProduct.hpp"
      12             : #include "DataStructures/Tensor/Tensor.hpp"
      13             : #include "DataStructures/Variables.hpp"
      14             : #include "Evolution/DiscontinuousGalerkin/Actions/ComputeTimeDerivativeHelpers.hpp"
      15             : #include "Evolution/DiscontinuousGalerkin/Actions/NormalCovectorAndMagnitude.hpp"
      16             : #include "Utilities/Gsl.hpp"
      17             : #include "Utilities/TMPL.hpp"
      18             : 
      19             : namespace evolution::dg::Actions::detail {
      20             : // Helper function to get parameter packs so we can forward `Tensor`s instead
      21             : // of `Variables` to the boundary corrections. Returns the maximum absolute
      22             : // char speed on the face, which can be used for setting or monitoring the CFL
      23             : // without having to compute the speeds for each dimension in the volume.
      24             : // Whether using only the face speeds is accurate enough to guarantee
      25             : // stability is yet to be determined. However, if the CFL condition is
      26             : // violated on the boundaries we are definitely in trouble, so it can at least
      27             : // be used as a cheap diagnostic.
      28             : template <typename System, typename BoundaryCorrection,
      29             :           typename... PackagedFieldTags, typename... ProjectedFieldTags,
      30             :           typename... ProjectedFieldTagsForCorrection, size_t Dim,
      31             :           typename... VolumeArgs>
      32             : double dg_package_data(
      33             :     const gsl::not_null<Variables<tmpl::list<PackagedFieldTags...>>*>
      34             :         packaged_data,
      35             :     const BoundaryCorrection& boundary_correction,
      36             :     const Variables<tmpl::list<ProjectedFieldTags...>>& projected_fields,
      37             :     const tnsr::i<DataVector, Dim, Frame::Inertial>& unit_normal_covector,
      38             :     const std::optional<tnsr::I<DataVector, Dim, Frame::Inertial>>&
      39             :         mesh_velocity,
      40             :     tmpl::list<ProjectedFieldTagsForCorrection...> /*meta*/,
      41             :     const VolumeArgs&... volume_args) {
      42             :   std::optional<Scalar<DataVector>> normal_dot_mesh_velocity{};
      43             :   if (mesh_velocity.has_value()) {
      44             :     normal_dot_mesh_velocity =
      45             :         dot_product(*mesh_velocity, unit_normal_covector);
      46             :   }
      47             : 
      48             :   if constexpr (evolution::dg::Actions::detail::
      49             :                     has_inverse_spatial_metric_tag_v<System>) {
      50             :     return boundary_correction.dg_package_data(
      51             :         make_not_null(&get<PackagedFieldTags>(*packaged_data))...,
      52             :         get<ProjectedFieldTagsForCorrection>(projected_fields)...,
      53             :         unit_normal_covector,
      54             :         get<evolution::dg::Actions::detail::NormalVector<Dim>>(
      55             :             projected_fields),
      56             :         mesh_velocity, normal_dot_mesh_velocity, volume_args...);
      57             :   } else {
      58             :     return boundary_correction.dg_package_data(
      59             :         make_not_null(&get<PackagedFieldTags>(*packaged_data))...,
      60             :         get<ProjectedFieldTagsForCorrection>(projected_fields)...,
      61             :         unit_normal_covector, mesh_velocity, normal_dot_mesh_velocity,
      62             :         volume_args...);
      63             :   }
      64             : }
      65             : 
      66             : template <typename System, typename BoundaryCorrection,
      67             :           typename... PackagedFieldTags, typename... ProjectedFieldTags,
      68             :           typename... ProjectedFieldTagsForCorrection, size_t Dim,
      69             :           typename... VolumeTags>
      70             : double dg_package_data(
      71             :     const gsl::not_null<Variables<tmpl::list<PackagedFieldTags...>>*>
      72             :         packaged_data,
      73             :     const BoundaryCorrection& boundary_correction,
      74             :     const Variables<tmpl::list<ProjectedFieldTags...>>& projected_fields,
      75             :     const tnsr::i<DataVector, Dim, Frame::Inertial>& unit_normal_covector,
      76             :     const std::optional<tnsr::I<DataVector, Dim, Frame::Inertial>>&
      77             :         mesh_velocity,
      78             :     const db::Access& box, tmpl::list<VolumeTags...> /*meta*/,
      79             :     tmpl::list<ProjectedFieldTagsForCorrection...> /*meta*/) {
      80             :   return dg_package_data<System>(
      81             :       packaged_data, boundary_correction, projected_fields,
      82             :       unit_normal_covector, mesh_velocity,
      83             :       tmpl::list<ProjectedFieldTagsForCorrection...>{},
      84             :       db::get<VolumeTags>(box)...);
      85             : }
      86             : }  // namespace evolution::dg::Actions::detail