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| Weno (::Limiters::WenoType weno_type, NewtonianEuler::Limiters::VariablesToLimit vars_to_limit, double neighbor_linear_weight, std::optional< double > tvb_constant, std::optional< double > kxrcf_constant, bool apply_flattener, bool disable_for_debugging=false, const Options::Context &context={}) |
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| Weno (const Weno &)=default |
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Weno & | operator= (const Weno &)=default |
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| Weno (Weno &&)=default |
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Weno & | operator= (Weno &&)=default |
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void | pup (PUP::er &p) |
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void | package_data (gsl::not_null< PackagedData * > packaged_data, const Scalar< DataVector > &mass_density_cons, const tnsr::I< DataVector, VolumeDim > &momentum_density, const Scalar< DataVector > &energy_density, const Mesh< VolumeDim > &mesh, const std::array< double, VolumeDim > &element_size, const OrientationMap< VolumeDim > &orientation_map) const |
| | Package data for sending to neighbor elements.
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bool | operator() (gsl::not_null< Scalar< DataVector > * > mass_density_cons, gsl::not_null< tnsr::I< DataVector, VolumeDim > * > momentum_density, gsl::not_null< Scalar< DataVector > * > energy_density, const Mesh< VolumeDim > &mesh, const Element< VolumeDim > &element, const std::array< double, VolumeDim > &element_size, const Scalar< DataVector > &det_inv_logical_to_inertial_jacobian, const typename evolution::dg::Tags::NormalCovectorAndMagnitude< VolumeDim >::type &normals_and_magnitudes, const EquationsOfState::EquationOfState< false, 2 > &equation_of_state, const std::unordered_map< DirectionalId< VolumeDim >, PackagedData, boost::hash< DirectionalId< VolumeDim > > > &neighbor_data) const |
| | Limit the solution on the element.
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template<size_t VolumeDim>
class NewtonianEuler::Limiters::Weno< VolumeDim >
A compact-stencil WENO limiter for the NewtonianEuler system.
Implements the simple WENO limiter of [219] and the Hermite WENO (HWENO) limiter of [220]. See the documentation of the system-agnostic Limiters::Weno limiter for a general discussion of the algorithm and the various options that control the action of the limiter. This implemention is specialized to the NewtonianEuler evolution system. By specializing the limiter to the system, we can add a few features that improve its robustness:
- the troubled-cell indicator (TCI) can be specialized to the features of the evolution system.
- the limiter can be applied to the system's characteristic variables. This is the recommendation of the reference, because it reduces spurious oscillations in the post-limiter solution.
- after limiting, the solution can be processed to remove any remaining unphysical values like negative densities and pressures. We do this by scaling the solution around its mean (a "flattener" or "bounds-preserving" filter). Note: the flattener is applied to all elements, including those where the limiter did not act to reduce the solution's slopes.
The matrix of TCI, variables to limit, post-processing, etc. choices can rapidly grow large. Here we reduce the possibilities by tying the TCI to the limiter in keeping with each limiter's main reference: HWENO uses the KXRCF TCI and simple WENO uses the TVB TCI. To fully explore the matrix of possibilities, the source code could be generalized — however, experience suggests it is unlikely that there exists one combination that will perform remarkably better than the others.