Represents a system of equations used to integrate the (chemical) source term at a single point using the CVODE integrator. More...

#include <sourceSystem.h>

Inheritance diagram for SourceSystemCVODE:

[legend]

Public Member Functions
	SourceSystemCVODE ()

int	f (const realtype t, const sdVector &y, sdVector &ydot)
	The ODE function: ydot = f(t,y)

int	denseJacobian (const realtype t, const sdVector &y, const sdVector &ydot, sdMatrix &J)
	Calculate the Jacobian matrix: J = df/dy.

int	fdJacobian (const realtype t, const sdVector &y, const sdVector &ydot, sdMatrix &J)
	A simpler finite difference based Jacobian.

void	setState (double tInitial, double uu, double tt, const dvec &yy)
	Set the initial condition for integrator.

int	integrateToTime (double tf)
	Take as many steps as needed to reach `tf`.

int	integrateOneStep (double tf)
	Take one step toward `tf` without stepping past it.

double	time () const
	Current integrator time, relative to `tInitial`.

void	unroll_y (const sdVector &y, double t)
	fill in the current state variables from `y`

void	unroll_y ()
	fill in the current state variables from the integrator state

void	roll_y (sdVector &y) const
	fill in `y` with the values of the current state variables

void	roll_ydot (sdVector &ydot) const
	fill in `ydot` with the values of the current time derivatives

std::string	getStats ()
	Return a string indicating the number of internal timesteps taken.

void	initialize (size_t nSpec)
	Resize internal arrays for a problem of the specified size (`nSpec+2`)

void	setOptions (ConfigOptions &options)
	Set integrator tolerances and other parameters.

virtual void	writeState (std::ostream &out, bool init)
	Write the current values of the state variables, formatted to be read by Python, to the specified stream.

void	writeJacobian (std::ostream &out)
	Print the current Jacobian matrix ot the specified stream.

Public Member Functions inherited from SourceSystem
	SourceSystem ()

virtual	~SourceSystem ()

virtual void	setDebug (bool debug_)

void	updateThermo ()
	Compute thermodynamic properties (density, enthalpies, heat capacities) from the current state variables.

double	getQdotIgniter (double t)
	Calculate the heat release rate associated with a possible external ignition source.

void	setGas (CanteraGas *_gas)
	Set the CanteraGas object to use for thermodynamic and kinetic property calculations.

void	setTimers (PerfTimer reactionRates, PerfTimer thermo, PerfTimer *jacobian)

void	setPosition (size_t j, double x)
	Set the index j and position x that are represented by this system.

void	setStrainFunction (ScalarFunction *f)
	Set the function used to compute the strain rate as a function of time.

void	setRateMultiplierFunction (ScalarFunction *f)
	Set the function used to compute the reaction rate multiplier.

void	setHeatLossFunction (IntegratorCallback *f)
	Set the function used to compute the heat loss rate to the environment.

void	setRhou (double _rhou)
	Set the density of the unburned mixture.

void	resetSplitConstants ()
	Set all the balanced splitting constants to zero.

void	setupQuasi2d (std::shared_ptr< BilinearInterpolator > vzInterp, std::shared_ptr< BilinearInterpolator > TInterp)
	Assign the interpolators used for solving quasi-2D problems.

Public Attributes
double	dUdt
	time derivative of the tangential velocity

double	dTdt
	time derivative of the temperature

dvec	dYdt
	time derivative of the species mass fractions

dvec	wDot
	species net production rates [kmol/m^3*s]

Public Attributes inherited from SourceSystem
double	U
	tangential velocity

double	T
	temperature

dvec	Y
	species mass fraction

dvec	splitConst
	Extra constant term introduced by splitting.

Private Attributes
std::unique_ptr< SundialsCvode >	integrator

SundialsContext	sunContext

Additional Inherited Members
Protected Attributes inherited from SourceSystem
bool	debug

ConfigOptions *	options

CanteraGas *	gas
	Cantera data.

PerfTimer *	reactionRatesTimer
	Timer for time spent evaluating reaction rates.

PerfTimer *	thermoTimer
	Timer for time spent evaluating thermodynamic properties.

PerfTimer *	jacobianTimer
	Timer for time spent evaluating and factorizing the Jacobian.

ScalarFunction *	strainFunction
	A class that provides the strain rate and its time derivative.

ScalarFunction *	rateMultiplierFunction
	Provides a multiplier (optional) for the production terms.

IntegratorCallback *	heatLoss
	Heat loss rate.

size_t	nSpec
	number of species

int	j
	grid index for this system

double	x
	grid position for this system

double	rhou
	density of the unburned gas

double	qDot
	heat release rate per unit volume [W/m^3]

double	qLoss
	heat loss to the environment [W/m^3]

double	rho
	density [kg/m^3]

double	cp
	specific heat capacity (average) [J/kg*K]

dvec	cpSpec
	species specific heat capacity [J/mol*K]

double	Wmx
	mixture molecular weight [kg/mol]

dvec	W
	species molecular weights [kg/kmol]

dvec	hk
	species enthalpies [J/kmol]

bool	quasi2d
	Flag set to 'true' when solving a quasi-2D problem with prescribed velocity and temperature fields.

std::shared_ptr< BilinearInterpolator >	vzInterp
	An interpolator for computing the axial (z) velocity when solving a quasi-2D problem.

std::shared_ptr< BilinearInterpolator >	TInterp
	An interpolator for computing the temperature when solving a quasi-2D problem.

Private Member Functions inherited from sdODE
virtual int	g (realtype t, sdVector &y, realtype *gOut)
	Optional function for CVODE to find roots of.

virtual int	bandedJacobian (const realtype t, const sdVector &y, const sdVector &ydot, sdBandMatrix &J)
	Optional function used to compute a banded Jacobian.

virtual	~sdODE ()

Detailed Description

Represents a system of equations used to integrate the (chemical) source term at a single point using the CVODE integrator.

Constructor & Destructor Documentation

◆ SourceSystemCVODE()

SourceSystemCVODE::SourceSystemCVODE ( )

inline

Member Function Documentation

◆ f()

int SourceSystemCVODE::f	(	const realtype	t,
		const sdVector &	y,
		sdVector &	ydot )

virtual

The ODE function: ydot = f(t,y)

Implements sdODE.

◆ denseJacobian()

int SourceSystemCVODE::denseJacobian	(	const realtype	t,
		const sdVector &	y,
		const sdVector &	ydot,
		sdMatrix &	J )

virtual

Calculate the Jacobian matrix: J = df/dy.

Reimplemented from sdODE.

◆ fdJacobian()

int SourceSystemCVODE::fdJacobian	(	const realtype	t,
		const sdVector &	y,
		const sdVector &	ydot,
		sdMatrix &	J )

A simpler finite difference based Jacobian.

◆ setState()

void SourceSystemCVODE::setState	(	double	tInitial,
		double	uu,
		double	tt,
		const dvec &	yy )

virtual

Set the initial condition for integrator.

Parameters

tInitial	integrator start time
uu	tangential velocity
tt	temperature
yy	vector of species mass fractions

Implements SourceSystem.

◆ integrateToTime()

int SourceSystemCVODE::integrateToTime ( double tf )

virtual

Take as many steps as needed to reach tf.

tf is relative to tInitial.

Implements SourceSystem.

◆ integrateOneStep()

int SourceSystemCVODE::integrateOneStep ( double tf )

virtual

Take one step toward tf without stepping past it.

tf is relative to tInitial.

Implements SourceSystem.

◆ time()

double SourceSystemCVODE::time ( ) const

virtual

Current integrator time, relative to tInitial.

Implements SourceSystem.

◆ unroll_y() [1/2]

void SourceSystemCVODE::unroll_y	(	const sdVector &	y,
		double	t )

fill in the current state variables from y

◆ unroll_y() [2/2]

void SourceSystemCVODE::unroll_y ( )

inlinevirtual

fill in the current state variables from the integrator state

Implements SourceSystem.

◆ roll_y()

void SourceSystemCVODE::roll_y ( sdVector & y ) const

fill in y with the values of the current state variables

◆ roll_ydot()

void SourceSystemCVODE::roll_ydot ( sdVector & ydot ) const

fill in ydot with the values of the current time derivatives

◆ getStats()

std::string SourceSystemCVODE::getStats ( )

virtual

Return a string indicating the number of internal timesteps taken.

Implements SourceSystem.

◆ initialize()

void SourceSystemCVODE::initialize ( size_t nSpec )

virtual

Resize internal arrays for a problem of the specified size (nSpec+2)

Reimplemented from SourceSystem.

◆ setOptions()

void SourceSystemCVODE::setOptions ( ConfigOptions & options_ )

virtual

Set integrator tolerances and other parameters.

Reimplemented from SourceSystem.

◆ writeState()

void SourceSystemCVODE::writeState	(	std::ostream &	out,
		bool	init )

virtual

Write the current values of the state variables, formatted to be read by Python, to the specified stream.

Call with init=true when first called to include initializers for the variables.

Reimplemented from SourceSystem.

◆ writeJacobian()

void SourceSystemCVODE::writeJacobian ( std::ostream & out )

virtual

Print the current Jacobian matrix ot the specified stream.

Reimplemented from SourceSystem.

Member Data Documentation

◆ dUdt

double SourceSystemCVODE::dUdt

time derivative of the tangential velocity

◆ dTdt

double SourceSystemCVODE::dTdt

time derivative of the temperature

◆ dYdt

dvec SourceSystemCVODE::dYdt

time derivative of the species mass fractions

◆ wDot

dvec SourceSystemCVODE::wDot

species net production rates [kmol/m^3*s]

◆ integrator

std::unique_ptr<SundialsCvode> SourceSystemCVODE::integrator

private

◆ sunContext

SundialsContext SourceSystemCVODE::sunContext

private

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

src/sourceSystem.h
src/sourceSystem.cpp

Public Member Functions

Public Attributes

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ SourceSystemCVODE()

Member Function Documentation

◆ f()

◆ denseJacobian()

◆ fdJacobian()

◆ setState()

◆ integrateToTime()

◆ integrateOneStep()

◆ time()

◆ unroll_y() [1/2]

◆ unroll_y() [2/2]

◆ roll_y()

◆ roll_ydot()

◆ getStats()

◆ initialize()

◆ setOptions()

◆ writeState()

◆ writeJacobian()

Member Data Documentation

◆ dUdt

◆ dTdt

◆ dYdt

◆ wDot

◆ integrator

◆ sunContext