TidalTensor Class Reference

Tidal tensor perterbation for AR. More...

#include <tidal_tensor.hpp>

Public Member Functions
	TidalTensor ()
void	dump (FILE *fp)
void	read (FILE *fp)
void	clear ()
template<class Tptcl >
void	fit (Tptcl *_ptcl_tt, Tptcl &_ptcl_cm, const PS::F64 _size)
	tidal tensor fitting function, More...
void	shiftCM (const PS::F64vec &_pos)
	Shift c.m. to new reference position. More...
void	eval (PS::F64 *acc, const PS::F64vec &pos) const
PS::F64	evalPot (const PS::F64vec &pos) const
void	print (std::ostream &_fout, const int _width) const

Static Public Member Functions
template<class Tptcl >
static void	createTidalTensorMeasureParticles (Tptcl *_ptcl_tt, const Tptcl &_ptcl_cm, const PS::F64 _size)
	create tidal tensor measurement particles More...
template<class Tptcl >
static void	subtractCMForce (Tptcl *_ptcl_tt, const Tptcl &_ptcl_cm)
	subtract c.m. force from measure points More...
static PS::S32	getParticleN ()
	get particle number More...

Public Attributes
PS::F64vec	pos
PS::F64	group_id

Detailed Description

Tidal tensor perterbation for AR.

Constructor & Destructor Documentation

TidalTensor()

TidalTensor::TidalTensor ( )

inline

Member Function Documentation

clear()

void TidalTensor::clear ( )

inline

createTidalTensorMeasureParticles()

template<class Tptcl >

static void TidalTensor::createTidalTensorMeasureParticles ( Tptcl *  _ptcl_tt, const Tptcl &  _ptcl_cm, const PS::F64  _size  )

inlinestatic

create tidal tensor measurement particles

2nd order: creat 4 zero-mass particles at the corners of regular tentrahedron with edge size of 0.16*_size. the cente is c.m. particle 3rd order: creat 8 zero-mass particles at the corners of cube with edge size of 0.16*_size. the cente is c.m. particle

• Assume _size is the maximum length,

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dump()

void TidalTensor::dump ( FILE *  fp )

inline

eval()

void TidalTensor::eval ( PS::F64 *  acc, const PS::F64vec &  pos  ) const

inline

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evalPot()

PS::F64 TidalTensor::evalPot ( const PS::F64vec &  pos ) const

inline

fit()

template<class Tptcl >

void TidalTensor::fit ( Tptcl *  _ptcl_tt, Tptcl &  _ptcl_cm, const PS::F64  _size  )

inline

tidal tensor fitting function,

Symmetry T2: xx xy xz 0 1 2 yx yy yz 3(1) 4 5 zx zy zz 6(2) 7(5) 8

General T2: xx xy xz 0 1 2 yx yy yz 3 4 5 zx zy zz 6 7 8

Symmetry T3: xxx xxy xxz 0 1 2 xyx xyy xyz 1 3 4 xzx xzy xzz 2 4 5

yxx yxy yxz 1 3 4 yyx yyy yyz 3 6 7
yzx yzy yzz 4 7 8

zxx zxy zxz 2 4 5 zyx zyy zyz 4 7 8 zzx zzy zzz 5 8 9

Parameters

[in]	_ptcl_tt	tidal tensor measure particles
[in]	_ptcl_cm	tidal tensor measure particle c.m.
[in]	_size	particle box size

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getParticleN()

static PS::S32 TidalTensor::getParticleN ( )

inlinestatic

get particle number

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print()

void TidalTensor::print ( std::ostream &  _fout, const int  _width  ) const

inline

read()

void TidalTensor::read ( FILE *  fp )

inline

shiftCM()

void TidalTensor::shiftCM ( const PS::F64vec &  _pos )

inline

Shift c.m. to new reference position.

Only the 1st order tensor need a correction from 2nd order

1st order:

T2: xx xy xz 0 1 2 yx yy yz 3 4 5 zx zy zz 6 7 8

2nd order:

xxx xxy xxz 0 1 2 xyx xyy xyz 1 3 4 xzx xzy xzz 2 4 5

yxx yxy yxz 1 3 4 yyx yyy yyz 3 6 7
yzx yzy yzz 4 7 8

zxx zxy zxz 2 4 5 zyx zyy zyz 4 7 8 zzx zzy zzz 5 8 9

Parameters

[in]

_pos

new c.m. position

subtractCMForce()

template<class Tptcl >

static void TidalTensor::subtractCMForce ( Tptcl *  _ptcl_tt, const Tptcl &  _ptcl_cm  )

inlinestatic

subtract c.m. force from measure points

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Member Data Documentation

group_id

PS::F64 TidalTensor::group_id

pos

PS::F64vec TidalTensor::pos

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

• tidal_tensor.hpp