An HLL (Harten-Lax-van Leer) Riemann solver for NewtonianEuler system. More...

#include <Hll.hpp>

Classes
struct	LargestIngoingCharSpeed

struct	LargestOutgoingCharSpeed

Public Types
using	options = tmpl::list<>

using	dg_package_field_tags = tmpl::list< Tags::MassDensityCons, Tags::MomentumDensity< Dim >, Tags::EnergyDensity, ::Tags::NormalDotFlux< Tags::MassDensityCons >, ::Tags::NormalDotFlux< Tags::MomentumDensity< Dim > >, ::Tags::NormalDotFlux< Tags::EnergyDensity >, LargestOutgoingCharSpeed, LargestIngoingCharSpeed >

using	dg_package_data_temporary_tags = tmpl::list<>

using	dg_package_data_primitive_tags = tmpl::list< hydro::Tags::SpatialVelocity< DataVector, Dim >, hydro::Tags::SpecificInternalEnergy< DataVector > >

using	dg_package_data_volume_tags = tmpl::list< hydro::Tags::EquationOfState< false, 2 > >

using	dg_boundary_terms_volume_tags = tmpl::list<>

Public Types inherited from NewtonianEuler::BoundaryCorrections::BoundaryCorrection< Dim >
using	creatable_classes = tmpl::list< Hll< Dim >, Hllc< Dim >, Rusanov< Dim > >

Public Member Functions
	Hll (const Hll &)=default

Hll &	operator= (const Hll &)=default

	Hll (Hll &&)=default

Hll &	operator= (Hll &&)=default

void	pup (PUP::er &p) override

std::unique_ptr< BoundaryCorrection< Dim > >	get_clone () const override

double	dg_package_data (gsl::not_null< Scalar< DataVector > * > packaged_mass_density, gsl::not_null< tnsr::I< DataVector, Dim, Frame::Inertial > * > packaged_momentum_density, gsl::not_null< Scalar< DataVector > * > packaged_energy_density, gsl::not_null< Scalar< DataVector > * > packaged_normal_dot_flux_mass_density, gsl::not_null< tnsr::I< DataVector, Dim, Frame::Inertial > * > packaged_normal_dot_flux_momentum_density, gsl::not_null< Scalar< DataVector > * > packaged_normal_dot_flux_energy_density, gsl::not_null< Scalar< DataVector > * > packaged_largest_outgoing_char_speed, gsl::not_null< Scalar< DataVector > * > packaged_largest_ingoing_char_speed, const Scalar< DataVector > &mass_density, const tnsr::I< DataVector, Dim, Frame::Inertial > &momentum_density, const Scalar< DataVector > &energy_density, const tnsr::I< DataVector, Dim, Frame::Inertial > &flux_mass_density, const tnsr::IJ< DataVector, Dim, Frame::Inertial > &flux_momentum_density, const tnsr::I< DataVector, Dim, Frame::Inertial > &flux_energy_density, const tnsr::I< DataVector, Dim, Frame::Inertial > &velocity, const Scalar< DataVector > &specific_internal_energy, const tnsr::i< DataVector, Dim, Frame::Inertial > &normal_covector, const std::optional< tnsr::I< DataVector, Dim, Frame::Inertial > > &, const std::optional< Scalar< DataVector > > &normal_dot_mesh_velocity, const EquationsOfState::EquationOfState< false, 2 > &equation_of_state) const

void	dg_boundary_terms (gsl::not_null< Scalar< DataVector > * > boundary_correction_mass_density, gsl::not_null< tnsr::I< DataVector, Dim, Frame::Inertial > * > boundary_correction_momentum_density, gsl::not_null< Scalar< DataVector > * > boundary_correction_energy_density, const Scalar< DataVector > &mass_density_int, const tnsr::I< DataVector, Dim, Frame::Inertial > &momentum_density_int, const Scalar< DataVector > &energy_density_int, const Scalar< DataVector > &normal_dot_flux_mass_density_int, const tnsr::I< DataVector, Dim, Frame::Inertial > &normal_dot_flux_momentum_density_int, const Scalar< DataVector > &normal_dot_flux_energy_density_int, const Scalar< DataVector > &largest_outgoing_char_speed_int, const Scalar< DataVector > &largest_ingoing_char_speed_int, const Scalar< DataVector > &mass_density_ext, const tnsr::I< DataVector, Dim, Frame::Inertial > &momentum_density_ext, const Scalar< DataVector > &energy_density_ext, const Scalar< DataVector > &normal_dot_flux_mass_density_ext, const tnsr::I< DataVector, Dim, Frame::Inertial > &normal_dot_flux_momentum_density_ext, const Scalar< DataVector > &normal_dot_flux_energy_density_ext, const Scalar< DataVector > &largest_outgoing_char_speed_ext, const Scalar< DataVector > &largest_ingoing_char_speed_ext, dg::Formulation dg_formulation) const

Public Member Functions inherited from NewtonianEuler::BoundaryCorrections::BoundaryCorrection< Dim >
	BoundaryCorrection (const BoundaryCorrection &)=default

BoundaryCorrection &	operator= (const BoundaryCorrection &)=default

	BoundaryCorrection (BoundaryCorrection &&)=default

BoundaryCorrection &	operator= (BoundaryCorrection &&)=default

virtual std::unique_ptr< BoundaryCorrection< Dim > >	get_clone () const =0

Static Public Attributes
static constexpr Options::String	help

Detailed Description

template<size_t Dim>
class NewtonianEuler::BoundaryCorrections::Hll< Dim >

An HLL (Harten-Lax-van Leer) Riemann solver for NewtonianEuler system.

Let \(U\) be the evolved variable, \(F^i\) the flux, and \(n_i\) be the outward directed unit normal to the interface. Denoting \(F := n_i F^i\), the HLL boundary correction is [82]

\begin{align*} G_\text{HLL} = \frac{\lambda_\text{max} F_\text{int} + \lambda_\text{min} F_\text{ext}}{\lambda_\text{max} - \lambda_\text{min}} - \frac{\lambda_\text{min}\lambda_\text{max}}{\lambda_\text{max} - \lambda_\text{min}} \left(U_\text{int} - U_\text{ext}\right) \end{align*}

where "int" and "ext" stand for interior and exterior. \(\lambda_\text{min}\) and \(\lambda_\text{max}\) are defined as

\begin{align*} \lambda_\text{min} &= \text{min}\left(\lambda^{-}_\text{int},-\lambda^{+}_\text{ext}, 0\right) \\ \lambda_\text{max} &= \text{max}\left(\lambda^{+}_\text{int},-\lambda^{-}_\text{ext}, 0\right) \end{align*}

where \(\lambda^{+}\) ( \(\lambda^{-}\)) is the largest characteristic speed in the outgoing (ingoing) direction. Note the minus signs in front of \(\lambda^{\pm}_\text{ext}\), which is because an outgoing speed w.r.t. the neighboring element is an ingoing speed w.r.t. the local element, and vice versa. Similarly, the \(F_{\text{ext}}\) term in \(G_\text{HLL}\) has a positive sign because the outward directed normal of the neighboring element has the opposite sign, i.e. \(n_i^{\text{ext}}=-n_i^{\text{int}}\).

For the NewtonianEuler system, \(\lambda^\pm\) are given as

\begin{align*} \lambda^\pm = v^in_i \pm c_s \end{align*}

where \(v^i\) is the spatial velocity and \(c_s\) the sound speed.

Note

In the strong form the dg_boundary_terms function returns \(G - F_\text{int}\)
For either \(\lambda_\text{min} = 0\) or \(\lambda_\text{max} = 0\) (i.e. all characteristics move in the same direction) the HLL boundary correction reduces to pure upwinding.
Some references use \(S\) instead of \(\lambda\) for the signal/characteristic speeds

Member Function Documentation

◆ get_clone()

template<size_t Dim>

std::unique_ptr< BoundaryCorrection< Dim > > NewtonianEuler::BoundaryCorrections::Hll< Dim >::get_clone ( ) const

overridevirtual

Implements NewtonianEuler::BoundaryCorrections::BoundaryCorrection< Dim >.

Member Data Documentation

◆ help

template<size_t Dim>

constexpr Options::String NewtonianEuler::BoundaryCorrections::Hll< Dim >::help

staticconstexpr

Initial value:

= {
      "Computes the HLL boundary correction term for the "
      "Newtonian Euler/hydrodynamics system."}

The documentation for this class was generated from the following file:

src/Evolution/Systems/NewtonianEuler/BoundaryCorrections/Hll.hpp

Classes

Public Types

Public Member Functions

Static Public Attributes

Detailed Description

Member Function Documentation

◆ get_clone()

Member Data Documentation

◆ help