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 <unordered_map>
       8             : #include <utility>
       9             : 
      10             : #include "Domain/Structure/Direction.hpp"  // IWYU pragma: keep
      11             : #include "Domain/Structure/DirectionalId.hpp"
      12             : #include "Domain/Structure/ElementId.hpp"  // IWYU pragma: keep
      13             : #include "Evolution/DiscontinuousGalerkin/Limiters/WenoOscillationIndicator.hpp"
      14             : #include "Utilities/Gsl.hpp"
      15             : 
      16             : /// \cond
      17             : class DataVector;
      18             : template <size_t>
      19             : class Mesh;
      20             : 
      21             : namespace boost {
      22             : template <class T>
      23             : struct hash;
      24             : }  // namespace boost
      25             : /// \endcond
      26             : 
      27             : namespace Limiters::Weno_detail {
      28             : 
      29             : // Compute the WENO weighted reconstruction of a DataVector, see e.g.,
      30             : // Eq. 4.3 of Zhu2016. This is fairly standard, though different references can
      31             : // differ in their choice of oscillation/smoothness indicator. The
      32             : // `DerivativeWeight` enum specifies the relative weight of each derivative
      33             : // term when computing the oscillation indicator.
      34             : //
      35             : // The reconstruction modifies the DataVector in `local_polynomial` by adding
      36             : // to it a weighted combination of one or more neighbor contributions, passed
      37             : // in as several DataVectors in `neighbor_polynommials`. Each neighbor
      38             : // polynomial must have the same mean as the local polynomial; this is checked
      39             : // with an ASSERT.
      40             : template <size_t VolumeDim>
      41             : void reconstruct_from_weighted_sum(
      42             :     gsl::not_null<DataVector*> local_polynomial, double neighbor_linear_weight,
      43             :     DerivativeWeight derivative_weight, const Mesh<VolumeDim>& mesh,
      44             :     const std::unordered_map<DirectionalId<VolumeDim>, DataVector,
      45             :                              boost::hash<DirectionalId<VolumeDim>>>&
      46             :         neighbor_polynomials);
      47             : 
      48             : }  // namespace Limiters::Weno_detail