Compute the largest characteristic speed of the GRFFE system with divergence cleaning. More...

#include <Characteristics.hpp>

Public Types
using	argument_tags = implementation defined

using	return_type = double

using	base = LargestCharacteristicSpeed

Public Types inherited from ForceFree::Tags::LargestCharacteristicSpeed
using	type = double

Static Public Member Functions
static void	function (gsl::not_null< double * > speed, const Scalar< DataVector > &lapse, const tnsr::I< DataVector, 3 > &shift, const tnsr::ii< DataVector, 3 > &spatial_metric)

Detailed Description

Compute the largest characteristic speed of the GRFFE system with divergence cleaning.

Wave speeds of the fast modes of the GRFFE system are the speed of light.

$\begin{aligned} λ_{\pm} = β^{i} β_{i} \pm α \end{aligned}$

where $α$ is the lapse and $β^{i}$ is the shift. Therefore the largest characteristic speed is $λ_{max} = \sqrt{β_{i} β^{i}} + α$ .

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

Public Types