Detailed Description

Implementation of LB collision model TRT [13].

Instead of providing two relaxation parameters, you can also provide one relaxation parameter omega and a "magic" number 'x'. The two relaxation parameters are then calculated as follows:

$\lambda_e = \omega$

$x = ( \frac{1}{\lambda_e} - 0.5 )( \frac{1}{\lambda_d} - 0.5 )$

Good choices for 'x' are 3 / 16 (exact solution for Poiseuille flow with wall distance = 0.5 [12]) and around 1 / 4 (best stability).

#include <CollisionModel.h>

Public Types
using	tag = TRT_tag

Public Member Functions
	TRT (const real_t _lambda_e, const real_t _lambda_d, const uint_t _level=uint_t(0))

void	pack (mpi::SendBuffer &buffer) const

void	unpack (mpi::RecvBuffer &buffer)

void	configure (IBlock &block, StructuredBlockStorage &sbs)
	Adapts the two relaxation parameters to the "right", level-dependent parameters once "configure" is called. More...

void	reset (const real_t _lambda_e, const real_t _lambda_d, const uint_t _lambda_level=uint_t(0))
	Only call this function if you know what you're doing (changes the viscosity!) "_lambda_level" is the level that corresponds to "_lambda_e" and "_lambda_d". More...

void	resetWithMagicNumber (const real_t _omega, const real_t _magicNumber=threeSixteenth, const uint_t omega_level=uint_t(0))
	Only call this function if you know what you're doing (changes the viscosity!) "omega_level" is the level that corresponds to "omega". More...

real_t	lambda_e () const

real_t	lambda_d () const

real_t	viscosity () const

real_t	viscosity (const cell_idx_t, const cell_idx_t, const cell_idx_t) const

real_t	omega () const

real_t	omega (const cell_idx_t, const cell_idx_t, const cell_idx_t, const Vector3< real_t > &=Vector3< real_t >(), const real_t=real_t(1)) const

real_t	omega_bulk () const

real_t	omega_odd () const

real_t	viscosity (const uint_t _level) const

uint_t	level () const

Static Public Member Functions
static TRT	constructWithMagicNumber (const real_t _omega, const real_t _magicNumber=threeSixteenth, const uint_t _level=uint_t(0))

static real_t	lambda_e (const real_t _omega)

static real_t	lambda_d (const real_t _omega, const real_t _magicNumber=threeSixteenth)

static real_t	magicNumber (const real_t _lambda_e, const real_t _lambda_d)

Static Public Attributes
static const real_t	threeSixteenth = real_t(3) / real_t(16)

Private Member Functions
	TRT ()

void	initWithMagicNumber (const real_t _omega, const real_t _magicNumber, const uint_t _level)

Private Attributes
real_t	lambda_e_

real_t	lambda_d_

real_t	magicNumber_

real_t	viscosity_

uint_t	level_

Member Typedef Documentation

◆ tag

using walberla::lbm::collision_model::TRT::tag = TRT_tag

Constructor & Destructor Documentation

◆ TRT() [1/2]

walberla::lbm::collision_model::TRT::TRT	(	const real_t	_lambda_e,
		const real_t	_lambda_d,
		const uint_t	_level = `uint_t(0)`
	)

inline

◆ TRT() [2/2]

walberla::lbm::collision_model::TRT::TRT ( )

inlineprivate

Member Function Documentation

◆ configure()

void walberla::lbm::collision_model::TRT::configure	(	IBlock &	block,
		StructuredBlockStorage &	sbs
	)

inline

Adapts the two relaxation parameters to the "right", level-dependent parameters once "configure" is called.

◆ constructWithMagicNumber()

static TRT walberla::lbm::collision_model::TRT::constructWithMagicNumber	(	const real_t	_omega,
		const real_t	_magicNumber = `threeSixteenth`,
		const uint_t	_level = `uint_t(0)`
	)

inlinestatic

◆ initWithMagicNumber()

void walberla::lbm::collision_model::TRT::initWithMagicNumber	(	const real_t	_omega,
		const real_t	_magicNumber,
		const uint_t	_level
	)

inlineprivate

◆ lambda_d() [1/2]

real_t walberla::lbm::collision_model::TRT::lambda_d ( ) const

inline

◆ lambda_d() [2/2]

static real_t walberla::lbm::collision_model::TRT::lambda_d	(	const real_t	_omega,
		const real_t	_magicNumber = `threeSixteenth`
	)

inlinestatic

◆ lambda_e() [1/2]

real_t walberla::lbm::collision_model::TRT::lambda_e ( ) const

inline

◆ lambda_e() [2/2]

static real_t walberla::lbm::collision_model::TRT::lambda_e ( const real_t _omega )

inlinestatic

◆ level()

uint_t walberla::lbm::collision_model::TRT::level ( ) const

inline

◆ magicNumber()

static real_t walberla::lbm::collision_model::TRT::magicNumber	(	const real_t	_lambda_e,
		const real_t	_lambda_d
	)

inlinestatic

◆ omega() [1/2]

real_t walberla::lbm::collision_model::TRT::omega ( ) const

inline

◆ omega() [2/2]

real_t walberla::lbm::collision_model::TRT::omega	(	const	cell_idx_t,
		const	cell_idx_t,
		const	cell_idx_t,
		const Vector3< real_t > &	= `Vector3<real_t>()`,
		const	real_t = `real_t(1)`
	)		const

inline

◆ omega_bulk()

real_t walberla::lbm::collision_model::TRT::omega_bulk ( ) const

inline

◆ omega_odd()

real_t walberla::lbm::collision_model::TRT::omega_odd ( ) const

inline

◆ pack()

void walberla::lbm::collision_model::TRT::pack ( mpi::SendBuffer & buffer ) const

inline

◆ reset()

void walberla::lbm::collision_model::TRT::reset	(	const real_t	_lambda_e,
		const real_t	_lambda_d,
		const uint_t	_lambda_level = `uint_t(0)`
	)

inline

Only call this function if you know what you're doing (changes the viscosity!) "_lambda_level" is the level that corresponds to "_lambda_e" and "_lambda_d".

◆ resetWithMagicNumber()

void walberla::lbm::collision_model::TRT::resetWithMagicNumber	(	const real_t	_omega,
		const real_t	_magicNumber = `threeSixteenth`,
		const uint_t	omega_level = `uint_t(0)`
	)

inline

Only call this function if you know what you're doing (changes the viscosity!) "omega_level" is the level that corresponds to "omega".

◆ unpack()

void walberla::lbm::collision_model::TRT::unpack ( mpi::RecvBuffer & buffer )

inline

◆ viscosity() [1/3]

real_t walberla::lbm::collision_model::TRT::viscosity ( ) const

inline

◆ viscosity() [2/3]

real_t walberla::lbm::collision_model::TRT::viscosity	(	const	cell_idx_t,
		const	cell_idx_t,
		const	cell_idx_t
	)		const

inline

◆ viscosity() [3/3]

real_t walberla::lbm::collision_model::TRT::viscosity ( const uint_t _level ) const

inline

Member Data Documentation

◆ lambda_d_

real_t walberla::lbm::collision_model::TRT::lambda_d_

private

◆ lambda_e_

real_t walberla::lbm::collision_model::TRT::lambda_e_

private

◆ level_

uint_t walberla::lbm::collision_model::TRT::level_

private

◆ magicNumber_

real_t walberla::lbm::collision_model::TRT::magicNumber_

private

◆ threeSixteenth

const real_t walberla::lbm::collision_model::TRT::threeSixteenth = real_t(3) / real_t(16)

static

◆ viscosity_

real_t walberla::lbm::collision_model::TRT::viscosity_

private

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

/builds/administration/walberla-website/walberla/src/lbm/lattice_model/CollisionModel.h
/builds/administration/walberla-website/walberla/src/lbm/lattice_model/CollisionModel.cpp

Detailed Description

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Private Member Functions

Private Attributes

Member Typedef Documentation

◆ tag

Constructor & Destructor Documentation

◆ TRT() [1/2]

◆ TRT() [2/2]

Member Function Documentation

◆ configure()

◆ constructWithMagicNumber()

◆ initWithMagicNumber()

◆ lambda_d() [1/2]

◆ lambda_d() [2/2]

◆ lambda_e() [1/2]

◆ lambda_e() [2/2]

◆ level()

◆ magicNumber()

◆ omega() [1/2]

◆ omega() [2/2]

◆ omega_bulk()

◆ omega_odd()

◆ pack()

◆ reset()

◆ resetWithMagicNumber()

◆ unpack()

◆ viscosity() [1/3]

◆ viscosity() [2/3]

◆ viscosity() [3/3]

Member Data Documentation

◆ lambda_d_

◆ lambda_e_

◆ level_

◆ magicNumber_

◆ threeSixteenth

◆ viscosity_