NewtonianEuler::subcell::TciOnFdGrid< Dim > Class Template Reference

Troubled-cell indicator applied to the finite difference subcell solution to check if the corresponding DG solution is admissible. More...

#include <TciOnFdGrid.hpp>

## Public Types

using return_tags = tmpl::list<::Tags::Variables< tmpl::list< MassDensity, Velocity, SpecificInternalEnergy, Pressure > >>

using argument_tags = tmpl::list< MassDensityCons, MomentumDensity, EnergyDensity, Inactive< MassDensityCons >, Inactive< MomentumDensity >, Inactive< EnergyDensity >, hydro::Tags::EquationOfStateBase, domain::Tags::Mesh< Dim > >

## Static Public Member Functions

template<size_t ThermodynamicDim>
static bool apply (gsl::not_null< Variables< tmpl::list< MassDensity, Velocity, SpecificInternalEnergy, Pressure >> * > subcell_grid_prim_vars, const Scalar< DataVector > &subcell_mass_density, const tnsr::I< DataVector, Dim, Frame::Inertial > &subcell_momentum_density, const Scalar< DataVector > &subcell_energy_density, const Scalar< DataVector > &dg_mass_density, const tnsr::I< DataVector, Dim, Frame::Inertial > &dg_momentum_density, const Scalar< DataVector > &dg_energy_density, const EquationsOfState::EquationOfState< false, ThermodynamicDim > &eos, const Mesh< Dim > &dg_mesh, double persson_exponent) noexcept

## Detailed Description

### template<size_t Dim> class NewtonianEuler::subcell::TciOnFdGrid< Dim >

Troubled-cell indicator applied to the finite difference subcell solution to check if the corresponding DG solution is admissible.

Computes the primitive variables on the DG and subcell grids, mutating the subcell/active primitive variables in the DataBox. Then,

• if the minimum density or pressure on either the DG or subcell mesh are below $$10^{-18}$$, marks the element as troubled and returns. We check both the FD and DG grids since when a discontinuity is inside the element oscillations in the DG solution can result in negative values that aren't present in the FD solution.
• runs the Persson TCI on the density and pressure on the DG grid. The reason for applying the Persson TCI to both the density and pressure is to flag cells at contact discontinuities. The Persson TCI only works with spectral-type methods and is a direct check of whether or not the DG solution is a good representation of the underlying data.

Please note that the TCI is run after the subcell solution has been reconstructed to the DG grid, and so Inactive<Tag> is the updated DG solution.

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