Strain-independent active stress model. More...

#include <ActiveStress.h>

Inheritance diagram for StrainIndependentActiveStress:

Public Member Functions
int	num_extra_equations () const override
	Number of equations this model owns beyond ChamberSphere's fixed 6 core equations. Every ActiveStress supplies at least the equation defining $\tau$ .
ActivationSignalType	required_signal_type () const override
	Type of activation signal this active stress model needs.
void	update_constant (SparseSystem &system, const std::vector< int > &global_eqn_ids, const std::vector< int > &global_var_ids) override
	Constant (time- and solution-independent) contributions.
void	update_time (SparseSystem &system, const std::vector< int > &global_eqn_ids, const std::vector< int > &global_var_ids, double activation_signal) override
	Time-dependent contributions.
void	update_solution (SparseSystem &system, const std::vector< int > &global_eqn_ids, const std::vector< int > &global_var_ids, const Eigen::Matrix< double, Eigen::Dynamic, 1 > &y, const Eigen::Matrix< double, Eigen::Dynamic, 1 > &dy, double radius0, double activation_signal) override
	Solution-dependent contributions.
Public Member Functions inherited from ActiveStress
	ActiveStress (const std::vector< std::pair< std::string, InputParameter > > &props)
	Construct an ActiveStress model.
virtual int	num_extra_vars () const
	Number of internal variables this model owns beyond ChamberSphere's fixed 5 (radius, velo, stress, tau, volume).
virtual std::list< std::string >	extra_var_names () const
	Names of this model's extra internal variables, in registration order (appended immediately after "volume").
Public Member Functions inherited from ParameterHolder
	ParameterHolder (const std::vector< std::pair< std::string, InputParameter > > &props)
	Construct a ParameterHolder.
void	set_param (const std::string &name, double value)
	Set a scalar parameter value by name.
void	set_param_vector (const std::string &name, const std::vector< double > &value)
	Set a vector-valued parameter value by name.
virtual void	finalize ()
	Called once after all parameters have been read from the input file (e.g. by the loader).

Additional Inherited Members
Static Public Member Functions inherited from ActiveStress
static std::unique_ptr< ActiveStress >	create (const std::string &type_str)
	Factory: create an active stress model from a type string.
Public Attributes inherited from ParameterHolder
const std::vector< std::pair< std::string, InputParameter > >	input_param_properties
	Properties of the input parameters for this component [(name, InputParameter), ...].
Static Public Attributes inherited from ActiveStress
static constexpr int	RADIUS_VAR
	Radius position within ChamberSphere's own global_var_ids array.
static constexpr int	VELO_VAR
static constexpr int	STRESS_VAR
static constexpr int	TAU_VAR
static constexpr int	VOLUME_VAR
	Volume position within ChamberSphere's own global_var_ids array.
static constexpr int	NUM_CORE_VARS
static constexpr int	NUM_CORE_EQNS
Protected Attributes inherited from ParameterHolder
std::map< std::string, double >	params_
	Map of scalar parameter names to their values.
std::map< std::string, std::vector< double > >	params_vec_
	Map of vector-valued parameter names to their values.

Detailed Description

Strain-independent active stress model.

Owns 1 extra equation (the $\tau$ ODE) and 0 extra variables:

$\‍[\dot{\tau} + |a| \tau - \sigma_\text{max} a_+ = 0, \quad a_+ = \max(a, 0), \quad a = f \alpha_\text{max} + (1 - f) \alpha_\text{min} \‍]$

where $f \in [0, 1]$ is the activation function.

Parameters: alpha_max, alpha_min, sigma_max

Member Function Documentation

◆ num_extra_equations()

int StrainIndependentActiveStress::num_extra_equations ( ) const

inlineoverridevirtual

Number of equations this model owns beyond ChamberSphere's fixed 6 core equations. Every ActiveStress supplies at least the equation defining $\tau$ .

Returns: Number of extra equations

Implements ActiveStress.

◆ required_signal_type()

ActivationSignalType StrainIndependentActiveStress::required_signal_type ( ) const

inlineoverridevirtual

Type of activation signal this active stress model needs.

Checked against the chamber's ActivationFunction::signal_type in ChamberSphere::setup_dofs to catch mismatched pairings (e.g. strain_dependent active stress with a normalized activation function).

Returns: The required ActivationSignalType

Implements ActiveStress.

◆ update_constant()

void StrainIndependentActiveStress::update_constant	(	SparseSystem &	system,
		const std::vector< int > &	global_eqn_ids,
		const std::vector< int > &	global_var_ids )

overridevirtual

Constant (time- and solution-independent) contributions.

Parameters

system	System to update contributions at
global_eqn_ids	ChamberSphere's global equation indices
global_var_ids	ChamberSphere's global variable indices

Reimplemented from ActiveStress.

◆ update_solution()

void StrainIndependentActiveStress::update_solution	(	SparseSystem &	system,
		const std::vector< int > &	global_eqn_ids,
		const std::vector< int > &	global_var_ids,
		const Eigen::Matrix< double, Eigen::Dynamic, 1 > &	y,
		const Eigen::Matrix< double, Eigen::Dynamic, 1 > &	dy,
		double	radius0,
		double	activation_signal )

overridevirtual

Solution-dependent contributions.

Parameters

system	System to update contributions at
global_eqn_ids	ChamberSphere's global equation indices
global_var_ids	ChamberSphere's global variable indices
y	Current solution
dy	Current derivative of the solution
radius0	Reference radius of the chamber
activation_signal	The chamber's ActivationFunction evaluated at the current time

Implements ActiveStress.

◆ update_time()

void StrainIndependentActiveStress::update_time	(	SparseSystem &	system,
		const std::vector< int > &	global_eqn_ids,
		const std::vector< int > &	global_var_ids,
		double	activation_signal )

overridevirtual

Time-dependent contributions.

Parameters

system	System to update contributions at
global_eqn_ids	ChamberSphere's global equation indices
global_var_ids	ChamberSphere's global variable indices
activation_signal	The chamber's ActivationFunction evaluated at the current time

Reimplemented from ActiveStress.

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

model/ActiveStress.h
model/ActiveStress.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ num_extra_equations()

◆ required_signal_type()

◆ update_constant()

◆ update_solution()

◆ update_time()