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/PrefixHelpers.hpp"
      10             : #include "DataStructures/DataBox/Prefixes.hpp"
      11             : #include "DataStructures/DataBox/Tag.hpp"
      12             : #include "DataStructures/Tensor/TypeAliases.hpp"
      13             : #include "DataStructures/Variables.hpp"
      14             : #include "Utilities/TMPL.hpp"
      15             : 
      16             : namespace evolution::dg::subcell::Tags {
      17             : /// \brief Holds the cell-centered fluxes on the subcell mesh.
      18             : ///
      19             : /// These are only needed when using high-order FD methods and when we are
      20             : /// actively doing FD. If either of these conditions isn't met, the value is
      21             : /// `std::nullopt`.
      22             : ///
      23             : /// The cell-centered fluxes are stored in the DataBox so they can be computed
      24             : /// and sent to neighbor elements without having to be recomputed after
      25             : /// receiving neighbor data. This means we maintain a single-send algorithm
      26             : /// despite going to high-order, with no additional FLOP overhead. We do,
      27             : /// however, have the memory overhead of the cell-centered fluxes.
      28             : ///
      29             : /// \note The `TagsList` is a list of the variables, not the fluxes. They are
      30             : /// wrapped in the `::Tags::Flux` prefix.
      31             : template <typename TagsList, size_t Dim, typename Fr = Frame::Inertial>
      32           1 : struct CellCenteredFlux : db::SimpleTag {
      33           0 :   using type = std::optional<Variables<
      34             :       db::wrap_tags_in<::Tags::Flux, TagsList, tmpl::size_t<Dim>, Fr>>>;
      35             : };
      36             : }  // namespace evolution::dg::subcell::Tags