control_system::ControlErrors::Translation Struct Reference

Control error in the 3D Translation coordinate map. More...

#include <Translation.hpp>

Public Types
using	object_centers = domain::object_list< domain::ObjectLabel::A, domain::ObjectLabel::B >
using	options = tmpl::list<>

Public Member Functions
void	pup (PUP::er &)
template<typename Metavariables , typename... TupleTags>
DataVector	operator() (const ::TimescaleTuner< true > &tuner, const Parallel::GlobalCache< Metavariables > &cache, const double time, const std::string &, const tuples::TaggedTuple< TupleTags... > &measurements)

Static Public Attributes
static constexpr size_t	expected_number_of_excisions = 2
static constexpr Options::String	help

Detailed Description

Control error in the 3D Translation coordinate map.

Details

Computes the error in how much the system has translated by using Eq. (42) from [137]. The equation is

\[ \left(0, \delta\vec{T}\right) = a\mathbf{q}\left(\mathbf{x}_A - \mathbf{c}_A - \mathbf{\delta q}\wedge\mathbf{c}_A - \frac{\delta a}{a}\mathbf{c}_A \right)\mathbf{q}^* \]

where object A is located on the positive x-axis in the grid frame, bold face letters are quaternions, vectors are promoted to quaternions as \( \mathbf{v} = (0, \vec{v}) \), \( \mathbf{q} \) is the quaternion from the Rotation map, \( a \) is the function \( a(t) \) from the CubicScale map, \( \mathbf{\delta q}\wedge\mathbf{c}_A \equiv (0, \delta\vec{q} \times \vec{c}_A) \), \( \delta\vec{q} \) is the Rotation control error, and \( \delta a\) is the Expansion control error.

Requirements:

• This control error requires that there be exactly two objects in the simulation
• Currently both these objects must be black holes
• Currently this control error can only be used with the Translation control system
• There must exist an expansion map and a quaternion rotation map in the coordinate map with names "Expansion" and "Rotation", respectively.

Member Data Documentation

help

constexpr Options::String control_system::ControlErrors::Translation::help

staticconstexpr

Initial value:

{
      "Computes the control error for translation control. This should not "
      "take any options."}

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

• src/ControlSystem/ControlErrors/Translation.hpp