Constant saddle-point coupling between velocity and pressure. More...

#include <NavierStokesForm.hpp>

Inheritance diagram for polyfem::solver::MixedLinearForm:

Collaboration diagram for polyfem::solver::MixedLinearForm:

Public Member Functions
	MixedLinearForm (int n_velocity_bases, int n_pressure_bases, const std::vector< basis::ElementBases > &velocity_bases, const std::vector< basis::ElementBases > &pressure_bases, const std::vector< basis::ElementBases > &geom_bases, const assembler::MixedAssembler &assembler, const assembler::AssemblyValsCache &velocity_cache, const assembler::AssemblyValsCache &pressure_cache, double t, bool is_volume)

std::string	name () const override

void	set_row_weights (double velocity_weight, double pressure_weight)

Public Member Functions inherited from polyfem::solver::Form
virtual	~Form ()

virtual void	init (const Eigen::VectorXd &x)
	Initialize the form.

virtual void	finish ()

virtual double	value (const Eigen::VectorXd &x) const
	Compute the value of the form multiplied with the weigth.

Eigen::VectorXd	value_per_element (const Eigen::VectorXd &x) const
	Compute the value of the form multiplied with the weigth.

virtual void	first_derivative (const Eigen::VectorXd &x, Eigen::VectorXd &gradv) const
	Compute the first derivative of the value wrt x multiplied with the weigth.

void	second_derivative (const Eigen::VectorXd &x, StiffnessMatrix &hessian) const
	Compute the second derivative of the value wrt x multiplied with the weigth.

virtual bool	is_step_valid (const Eigen::VectorXd &x0, const Eigen::VectorXd &x1) const
	Determine if a step from solution x0 to solution x1 is allowed.

virtual double	max_step_size (const Eigen::VectorXd &x0, const Eigen::VectorXd &x1) const
	Determine the maximum step size allowable between the current and next solution.

virtual void	line_search_begin (const Eigen::VectorXd &x0, const Eigen::VectorXd &x1)
	Initialize variables used during the line search.

virtual void	line_search_end ()
	Clear variables used during the line search.

virtual void	post_step (const polysolve::nonlinear::PostStepData &data)
	Update fields after a step in the optimization.

virtual void	solution_changed (const Eigen::VectorXd &new_x)
	Update cached fields upon a change in the solution.

virtual void	update_quantities (const double t, const Eigen::VectorXd &x)
	Update time-dependent fields.

virtual void	init_lagging (const Eigen::VectorXd &x)
	Initialize lagged fields TODO: more than one step.

virtual void	update_lagging (const Eigen::VectorXd &x, const int iter_num)
	Update lagged fields.

virtual int	max_lagging_iterations () const
	Get the maximum number of lagging iteration allowable.

virtual bool	uses_lagging () const
	Does this form require lagging?

virtual void	set_project_to_psd (bool val)
	Set project to psd.

bool	is_project_to_psd () const
	Get if the form's second derivative is projected to psd.

void	enable ()
	Enable the form.

void	disable ()
	Disable the form.

void	set_enabled (const bool enabled)
	Set if the form is enabled.

bool	enabled () const
	Determine if the form is enabled.

virtual double	weight () const
	Get the form's multiplicative constant weight.

void	set_weight (const double weight)
	Set the form's multiplicative constant weight.

virtual bool	is_step_collision_free (const Eigen::VectorXd &x0, const Eigen::VectorXd &x1) const
	Checks if the step is collision free.

void	set_output_dir (const std::string &output_dir)

virtual void	set_scale (const double scale)
	sets the scale for the form

Protected Member Functions
double	value_unweighted (const Eigen::VectorXd &x) const override
	Compute the value of the form.

void	first_derivative_unweighted (const Eigen::VectorXd &x, Eigen::VectorXd &residual) const override
	Compute the first derivative of the value wrt x.

void	second_derivative_unweighted (const Eigen::VectorXd &x, StiffnessMatrix &jacobian) const override
	Compute the second derivative of the value wrt x.

Protected Member Functions inherited from polyfem::solver::Form
std::string	resolve_output_path (const std::string &path) const

virtual Eigen::VectorXd	value_per_element_unweighted (const Eigen::VectorXd &x) const
	Compute the value of the form multiplied per element.

Private Attributes
int	velocity_ndof_

int	pressure_ndof_

StiffnessMatrix	coupling_

double	velocity_weight_ = 1

double	pressure_weight_ = 1

Additional Inherited Members
Protected Attributes inherited from polyfem::solver::Form
bool	project_to_psd_ = false
	If true, the form's second derivative is projected to be positive semidefinite.

double	weight_ = 1
	weight of the form (e.g., AL penalty weight or Δt²)

bool	enabled_ = true
	If true, the form is enabled.

std::string	output_dir_

Detailed Description

Constant saddle-point coupling between velocity and pressure.

Definition at line 54 of file NavierStokesForm.hpp.

Constructor & Destructor Documentation

◆ MixedLinearForm()

polyfem::solver::MixedLinearForm::MixedLinearForm	(	int	n_velocity_bases,
		int	n_pressure_bases,
		const std::vector< basis::ElementBases > &	velocity_bases,
		const std::vector< basis::ElementBases > &	pressure_bases,
		const std::vector< basis::ElementBases > &	geom_bases,
		const assembler::MixedAssembler &	assembler,
		const assembler::AssemblyValsCache &	velocity_cache,
		const assembler::AssemblyValsCache &	pressure_cache,
		double	t,
		bool	is_volume
	)