Abstract class for engines supporting Jacobian and stoichiometry operations. More...

#include <engine_abstract.h>

Inheritance diagram for gridfire::DynamicEngine:

Collaboration diagram for gridfire::DynamicEngine:

Public Member Functions
virtual void	generateJacobianMatrix (const fourdst::composition::Composition &comp, double T9, double rho) const =0
	Generate the Jacobian matrix for the current state.

virtual void	generateJacobianMatrix (const fourdst::composition::Composition &comp, double T9, double rho, const std::vector< fourdst::atomic::Species > &activeSpecies) const =0

virtual void	generateJacobianMatrix (const fourdst::composition::Composition &comp, double T9, double rho, const SparsityPattern &sparsityPattern) const =0

virtual double	getJacobianMatrixEntry (const fourdst::atomic::Species &rowSpecies, const fourdst::atomic::Species &colSpecies) const =0
	Get an entry from the previously generated Jacobian matrix.

virtual void	generateStoichiometryMatrix ()=0
	Generate the stoichiometry matrix for the network.

virtual int	getStoichiometryMatrixEntry (const fourdst::atomic::Species &species, const reaction::Reaction &reaction) const =0
	Get an entry from the stoichiometry matrix.

virtual double	calculateMolarReactionFlow (const reaction::Reaction &reaction, const fourdst::composition::Composition &comp, double T9, double rho) const =0
	Calculate the molar reaction flow for a given reaction.

virtual EnergyDerivatives	calculateEpsDerivatives (const fourdst::composition::Composition &comp, double T9, double rho) const =0
	Calculate the derivatives of the energy generation rate with respect to T and rho.

virtual const reaction::ReactionSet &	getNetworkReactions () const =0
	Get the set of logical reactions in the network.

virtual void	setNetworkReactions (const reaction::ReactionSet &reactions)=0

virtual std::expected< std::unordered_map< fourdst::atomic::Species, double >, expectations::StaleEngineError >	getSpeciesTimescales (const fourdst::composition::Composition &comp, double T9, double rho) const =0
	Compute timescales for all species in the network.

virtual std::expected< std::unordered_map< fourdst::atomic::Species, double >, expectations::StaleEngineError >	getSpeciesDestructionTimescales (const fourdst::composition::Composition &comp, double T9, double rho) const =0

virtual fourdst::composition::Composition	update (const NetIn &netIn)=0
	Update the internal state of the engine.

virtual bool	isStale (const NetIn &netIn)=0

virtual void	setScreeningModel (screening::ScreeningType model)=0
	Set the electron screening model.

virtual screening::ScreeningType	getScreeningModel () const =0
	Get the current electron screening model.

virtual size_t	getSpeciesIndex (const fourdst::atomic::Species &species) const =0
	Get the index of a species in the network.

virtual std::vector< double >	mapNetInToMolarAbundanceVector (const NetIn &netIn) const =0
	Map a NetIn object to a vector of molar abundances.

virtual PrimingReport	primeEngine (const NetIn &netIn)=0
	Prime the engine with initial conditions.

virtual BuildDepthType	getDepth () const
	Get the depth of the network.

virtual void	rebuild (const fourdst::composition::Composition &comp, BuildDepthType depth)
	Rebuild the network with a specified depth.

virtual fourdst::composition::Composition	collectComposition (fourdst::composition::Composition &comp) const =0
	Recursively collect composition from current engine and any sub engines if they exist.

Public Member Functions inherited from gridfire::Engine
virtual	~Engine ()=default
	Virtual destructor.

virtual const std::vector< fourdst::atomic::Species > &	getNetworkSpecies () const =0
	Get the list of species in the network.

virtual std::expected< StepDerivatives< double >, expectations::StaleEngineError >	calculateRHSAndEnergy (const fourdst::composition::Composition &comp, double T9, double rho) const =0
	Calculate the right-hand side (dY/dt) and energy generation.

Detailed Description

Abstract class for engines supporting Jacobian and stoichiometry operations.

Extends Engine with additional methods for:

Generating and accessing the Jacobian matrix (for implicit solvers).
Generating and accessing the stoichiometry matrix.
Calculating molar reaction flows for individual reactions.
Accessing the set of logical reactions in the network.
Computing timescales for each species.

Intended usage: Derive from this class to implement engines that support advanced solver features such as implicit integration, sensitivity analysis, QSE (Quasi-Steady-State Equilibrium) handling, and more.

Member Function Documentation

◆ calculateEpsDerivatives()

virtual EnergyDerivatives gridfire::DynamicEngine::calculateEpsDerivatives	(	const fourdst::composition::Composition &	comp,
		double	T9,
		double	rho ) const

nodiscardpure virtual

Calculate the derivatives of the energy generation rate with respect to T and rho.

Parameters

comp	Composition object containing current abundances.
T9	Temperature in units of 10^9 K.
rho	Density in g/cm^3.

Returns: EnergyDerivatives containing dEps/dT and dEps/dRho.

This method computes the partial derivatives of the specific nuclear energy generation rate with respect to temperature and density for the current state.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ calculateMolarReactionFlow()

virtual double gridfire::DynamicEngine::calculateMolarReactionFlow	(	const reaction::Reaction &	reaction,
		const fourdst::composition::Composition &	comp,
		double	T9,
		double	rho ) const

nodiscardpure virtual

Calculate the molar reaction flow for a given reaction.

Parameters

reaction	The reaction for which to calculate the flow.
comp	Composition object containing current abundances.
T9	Temperature in units of 10^9 K.
rho	Density in g/cm^3.

Returns: Molar flow rate for the reaction (e.g., mol/g/s).

This method computes the net rate at which the given reaction proceeds under the current state.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ collectComposition()

virtual fourdst::composition::Composition gridfire::DynamicEngine::collectComposition ( fourdst::composition::Composition & comp ) const

pure virtual

Recursively collect composition from current engine and any sub engines if they exist.

If species i is defined in comp and in any sub engine or self composition then the molar abundance of species i in the returned composition will be that defined in comp. If there are species defined in sub engine compositions which are not defined in comp then their molar abundances will be based on the reported values from each sub engine.

Note: It is up to each engine to decide how to handle filling in the return composition.; These methods return an unfinalized composition which must then be finalized by the caller

Parameters

comp	Input composition to "normalize".

Returns: An updated composition which is a superset of comp. This may contain species which were culled, for example, by either QSE partitioning or reaction flow rate culling

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ generateJacobianMatrix() [1/3]

virtual void gridfire::DynamicEngine::generateJacobianMatrix	(	const fourdst::composition::Composition &	comp,
		double	T9,
		double	rho ) const

pure virtual

Generate the Jacobian matrix for the current state.

Parameters

comp	Composition object containing current abundances.
T9	Temperature in units of 10^9 K.
rho	Density in g/cm^3.

This method must compute and store the Jacobian matrix (∂(dY/dt)_i/∂Y_j) for the current state. The matrix can then be accessed via getJacobianMatrixEntry().

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ generateJacobianMatrix() [2/3]

virtual void gridfire::DynamicEngine::generateJacobianMatrix	(	const fourdst::composition::Composition &	comp,
		double	T9,
		double	rho,
		const SparsityPattern &	sparsityPattern ) const

pure virtual

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ generateJacobianMatrix() [3/3]

virtual void gridfire::DynamicEngine::generateJacobianMatrix	(	const fourdst::composition::Composition &	comp,
		double	T9,
		double	rho,
		const std::vector< fourdst::atomic::Species > &	activeSpecies ) const

pure virtual

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ generateStoichiometryMatrix()

virtual void gridfire::DynamicEngine::generateStoichiometryMatrix ( )

pure virtual

Generate the stoichiometry matrix for the network.

This method must compute and store the stoichiometry matrix, which encodes the net change of each species in each reaction.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ getDepth()

virtual BuildDepthType gridfire::DynamicEngine::getDepth ( ) const

inlinenodiscardvirtual

Get the depth of the network.

Returns: The depth of the network, which may indicate the level of detail or complexity in the reaction network.

This method is intended to provide information about the network's structure, such as how many layers of reactions or species are present. It can be useful for diagnostics and understanding the network's complexity.

Reimplemented in gridfire::GraphEngine, and PyDynamicEngine.

◆ getJacobianMatrixEntry()

virtual double gridfire::DynamicEngine::getJacobianMatrixEntry	(	const fourdst::atomic::Species &	rowSpecies,
		const fourdst::atomic::Species &	colSpecies ) const

nodiscardpure virtual

Get an entry from the previously generated Jacobian matrix.

Parameters

rowSpecies	The species corresponding to the row index (i)
colSpecies	The species corresponding to the column index (j)

Returns: Value of the Jacobian matrix at (i, j).

The Jacobian must have been generated by generateJacobianMatrix() before calling this.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ getNetworkReactions()

virtual const reaction::ReactionSet & gridfire::DynamicEngine::getNetworkReactions ( ) const

nodiscardpure virtual

Get the set of logical reactions in the network.

Returns: Reference to the LogicalReactionSet containing all reactions.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ getScreeningModel()

virtual screening::ScreeningType gridfire::DynamicEngine::getScreeningModel ( ) const

nodiscardpure virtual

Get the current electron screening model.

Returns: The currently active screening model type.

Usage Example:: screening::ScreeningType currentModel = myEngine.getScreeningModel();

gridfire::screening::ScreeningType
ScreeningType
Enumerates the available plasma screening models.
Definition screening_types.h:15

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ getSpeciesDestructionTimescales()

virtual std::expected< std::unordered_map< fourdst::atomic::Species, double >, expectations::StaleEngineError > gridfire::DynamicEngine::getSpeciesDestructionTimescales	(	const fourdst::composition::Composition &	comp,
		double	T9,
		double	rho ) const

nodiscardpure virtual

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ getSpeciesIndex()

virtual size_t gridfire::DynamicEngine::getSpeciesIndex ( const fourdst::atomic::Species & species ) const

nodiscardpure virtual

Get the index of a species in the network.

Parameters

species The species to look up.

This method allows querying the index of a specific species in the engine's internal representation. It is useful for accessing species data efficiently.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ getSpeciesTimescales()

virtual std::expected< std::unordered_map< fourdst::atomic::Species, double >, expectations::StaleEngineError > gridfire::DynamicEngine::getSpeciesTimescales	(	const fourdst::composition::Composition &	comp,
		double	T9,
		double	rho ) const

nodiscardpure virtual

Compute timescales for all species in the network.

Parameters

comp	Composition object containing current abundances.
T9	Temperature in units of 10^9 K.
rho	Density in g/cm^3.

Returns: Map from Species to their characteristic timescales (s).

This method estimates the timescale for abundance change of each species, which can be used for timestep control, diagnostics, and reaction network culling.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ getStoichiometryMatrixEntry()

virtual int gridfire::DynamicEngine::getStoichiometryMatrixEntry	(	const fourdst::atomic::Species &	species,
		const reaction::Reaction &	reaction ) const

nodiscardpure virtual

Get an entry from the stoichiometry matrix.

Parameters

species	species to look up stoichiometry for.
reaction	reaction to find

Returns: Stoichiometric coefficient for the species in the reaction.

The stoichiometry matrix must have been generated by generateStoichiometryMatrix().

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ isStale()

virtual bool gridfire::DynamicEngine::isStale ( const NetIn & netIn )

pure virtual

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ mapNetInToMolarAbundanceVector()

virtual std::vector< double > gridfire::DynamicEngine::mapNetInToMolarAbundanceVector ( const NetIn & netIn ) const

nodiscardpure virtual

Map a NetIn object to a vector of molar abundances.

Parameters

netIn The input conditions for the network.

Returns: A vector of molar abundances corresponding to the species in the network.

This method converts the input conditions into a vector of molar abundances, which can be used for further calculations or diagnostics.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ primeEngine()

virtual PrimingReport gridfire::DynamicEngine::primeEngine ( const NetIn & netIn )

nodiscardpure virtual

Prime the engine with initial conditions.

Parameters

netIn The input conditions for the network.

Returns: PrimingReport containing information about the priming process.

This method is used to prepare the engine for calculations by setting up initial conditions, reactions, and species. It may involve compiling reaction rates, initializing internal data structures, and performing any necessary pre-computation.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ rebuild()

virtual void gridfire::DynamicEngine::rebuild	(	const fourdst::composition::Composition &	comp,
		BuildDepthType	depth )

inlinevirtual

Rebuild the network with a specified depth.

Parameters

comp	The composition to rebuild the network with.
depth	The desired depth of the network.

This method is intended to allow dynamic adjustment of the network's depth, which may involve adding or removing species and reactions based on the specified depth. However, not all engines support this operation.

Reimplemented in gridfire::GraphEngine, and PyDynamicEngine.

◆ setNetworkReactions()

virtual void gridfire::DynamicEngine::setNetworkReactions ( const reaction::ReactionSet & reactions )

pure virtual

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ setScreeningModel()

virtual void gridfire::DynamicEngine::setScreeningModel ( screening::ScreeningType model )

pure virtual

Set the electron screening model.

Parameters

model The type of screening model to use for reaction rate calculations.

This method allows changing the screening model at runtime. Screening corrections account for the electrostatic shielding of nuclei by electrons, which affects reaction rates in dense stellar plasmas.

Usage Example:: myEngine.setScreeningModel(screening::ScreeningType::WEAK);

gridfire::screening::ScreeningType::WEAK
@ WEAK
Weak screening model (Salpeter, 1954).
Definition screening_types.h:35

Postcondition: The engine will use the specified screening model for subsequent rate calculations.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

◆ update()

virtual fourdst::composition::Composition gridfire::DynamicEngine::update ( const NetIn & netIn )

pure virtual

Update the internal state of the engine.

Parameters

netIn A struct containing the current network input, such as temperature, density, and composition.

This method is intended to be implemented by derived classes to update their internal state based on the provided network conditions. For example, an adaptive engine might use this to re-evaluate which reactions and species are active. For other engines that do not support manually updating, this method might do nothing.

Usage Example:: NetIn input = { ... };

myEngine.update(input);

gridfire::NetIn
Definition network.h:51

Postcondition: The internal state of the engine is updated to reflect the new conditions.

Implemented in gridfire::AdaptiveEngineView, gridfire::DefinedEngineView, gridfire::GraphEngine, gridfire::MultiscalePartitioningEngineView, and PyDynamicEngine.

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

src/include/gridfire/engine/engine_abstract.h

Public Member Functions

Detailed Description

Member Function Documentation

◆ calculateEpsDerivatives()

◆ calculateMolarReactionFlow()

◆ collectComposition()

◆ generateJacobianMatrix() [1/3]

◆ generateJacobianMatrix() [2/3]

◆ generateJacobianMatrix() [3/3]

◆ generateStoichiometryMatrix()

◆ getDepth()

◆ getJacobianMatrixEntry()

◆ getNetworkReactions()

◆ getScreeningModel()

◆ getSpeciesDestructionTimescales()

◆ getSpeciesIndex()

◆ getSpeciesTimescales()

◆ getStoichiometryMatrixEntry()

◆ isStale()

◆ mapNetInToMolarAbundanceVector()

◆ primeEngine()

◆ rebuild()

◆ setNetworkReactions()

◆ setScreeningModel()

◆ update()