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"
      11              : #include "Domain/Structure/DirectionalId.hpp"
      12              : #include "Domain/Structure/ElementId.hpp"
      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