Class where it is implemented a reduced problem for the steady Navier-stokes problem. More...

#include <ReducedSteadyNS.H>

Inheritance diagram for reducedSteadyNS:

Public Member Functions
	reducedSteadyNS ()
	Construct Null.

	reducedSteadyNS (steadyNS &problem)
	Construct Null.

	~reducedSteadyNS ()

void	solveOnline_PPE (Eigen::MatrixXd vel_now)
	Method to perform an online solve using a PPE stabilisation method.

void	solveOnline_sup (Eigen::MatrixXd vel_now)
	Method to perform an online solve using a supremizer stabilisation method.

void	reconstruct_PPE (fileName folder="./ITHACAoutput/online_rec", int printevery=1)
	Method to reconstruct a solution from an online solve with a PPE stabilisation technique.

void	reconstruct (bool exportFields=false, fileName folder="./ITHACAoutput/online_rec", int printevery=1)
	Method to reconstruct the solutions from an online solve.

void	reconstructLiftAndDrag (steadyNS &problem, fileName folder)
	Method to compute the reduced order forces.

double	inf_sup_constant ()
	Method to evaluate the online inf-sup constant.

Eigen::MatrixXd	setOnlineVelocity (Eigen::MatrixXd vel)
	Sets the online velocity.

Public Member Functions inherited from reducedProblem
	reducedProblem ()
	Construct Null.

virtual	~reducedProblem ()

	reducedProblem (reductionProblem &problem)
	Construct with reduced Problem.

virtual void	solveOnline ()
	Virtual Method to perform and online Solve.

Public Attributes
ITHACAparameters *	para
	parameters to be read from the ITHACAdict file

Eigen::MatrixXd	vel_now
	Online inlet velocity vector.

Eigen::MatrixXd	fTau
	Reduced matrix for tangent forces.

Eigen::MatrixXd	fN
	Reduced matrix for normal forces.

Eigen::VectorXd	y_old
	Vector to store the previous solution during the Newton procedure.

Eigen::VectorXd	y
	Vector to store the solution during the Newton procedure.

scalar	nu
	Reduced viscosity in case of parametrized viscosity.

List< Eigen::MatrixXd >	online_solution
	List of Eigen matrices to store the online solution.

PtrList< volVectorField >	Umodes
	List of pointers to store the modes for velocity.

PtrList< volScalarField >	Pmodes
	List of pointers to store the modes for pressure.

PtrList< volVectorField >	Usnapshots
	List of pointers to store the snapshots for velocity.

PtrList< volScalarField >	Psnapshots
	List of pointers to store the snapshots for pressure.

PtrList< volScalarField >	PREC
	Reconstructed pressure field.

PtrList< volVectorField >	UREC
	Recontructed velocity field.

PtrList< volScalarField >	pRecFields
	Reconstructed pressure fields list.

PtrList< volVectorField >	uRecFields
	Recontructed velocity fields list.

newton_steadyNS	newton_object
	Newton object used to solve the non linear problem.

steadyNS *	problem
	Pointer to the FOM problem.

int	Nphi_u
	Number of velocity modes.

int	Nphi_p
	Number of pressure modes.

int	Nphi_sup
	Number of supremizer modes.

int	N_BC
	Number of parametrized boundary conditions.

int	count_online_solve = 1
	Counter to count the online solutions.

Eigen::MatrixXd	tauU
	Penalty Factor.

Public Attributes inherited from reducedProblem
scalar	nu
	Viscosity.

reductionProblem *	problem
	Pointer to FOAM problem.

Additional Inherited Members
Static Public Member Functions inherited from reducedProblem
static Eigen::MatrixXd	solveLinearSys (List< Eigen::MatrixXd > LinSys, Eigen::MatrixXd x, Eigen::VectorXd &residual, const Eigen::MatrixXd &bc=Eigen::MatrixXd::Zero(0, 0), const std::string solverType="fullPivLu")
	Linear system solver for the online problem.

static Eigen::MatrixXd	solveLinearSys (List< Eigen::MatrixXd > LinSys, Eigen::MatrixXd x, Eigen::VectorXd &residual, const std::string solverType)
	Linear system solver for the online problem.

Detailed Description

Class where it is implemented a reduced problem for the steady Navier-stokes problem.

In this class are implemented the methods to solve a reduced version of the stationary Navier-stokes equations. This class must be used together with the steadyNS class

Examples: 03steadyNS.C, and 06POD_RBF.C.

Definition at line 85 of file ReducedSteadyNS.H.

Constructor & Destructor Documentation

◆ reducedSteadyNS() [1/2]

reducedSteadyNS::reducedSteadyNS ( )

Construct Null.

Definition at line 39 of file ReducedSteadyNS.C.

◆ reducedSteadyNS() [2/2]

reducedSteadyNS::reducedSteadyNS ( steadyNS & problem )

explicit

Construct Null.

Parameters

[in]	problem	a full order steadyNS problem
[in]	tipo	Type of pressure stabilisation method you want to use "SUP" for supremizer, "PPE" for pressure Poisson equation.

Definition at line 44 of file ReducedSteadyNS.C.

◆ ~reducedSteadyNS()

reducedSteadyNS::~reducedSteadyNS ( )

inline

Definition at line 101 of file ReducedSteadyNS.H.

Member Function Documentation

◆ inf_sup_constant()

double reducedSteadyNS::inf_sup_constant ( )

Method to evaluate the online inf-sup constant.

Returns: return the reduced version of the inf-sup constant.

Definition at line 295 of file ReducedSteadyNS.C.

◆ reconstruct()

void reducedSteadyNS::reconstruct	(	bool	exportFields = false,
		fileName	folder = "./ITHACAoutput/online_rec",
		int	printevery = 1 )

Method to reconstruct the solutions from an online solve.

Parameters

[in]	exportFields	A boolean variable which determines whether to export fields or not
[in]	folder	The folder where to output the solutions in case on wants to
[in]	printevery	The printevery variabel, when it is 1 the function outputs all stored fields

Definition at line 249 of file ReducedSteadyNS.C.

◆ reconstruct_PPE()

void reducedSteadyNS::reconstruct_PPE	(	fileName	folder = "./ITHACAoutput/online_rec",
		int	printevery = 1 )

Method to reconstruct a solution from an online solve with a PPE stabilisation technique.

stabilisation method

Parameters

[in]	folder	The folder where to output the solutions
[in]	printevery	The printevery

Definition at line 215 of file ReducedSteadyNS.C.

◆ reconstructLiftAndDrag()

void reducedSteadyNS::reconstructLiftAndDrag	(	steadyNS &	problem,
		fileName	folder )

Method to compute the reduced order forces.

Parameters

	problem	a steadyNS full order problem.
[in]	folder	The folder where to output the forces matrices

Definition at line 317 of file ReducedSteadyNS.C.

◆ setOnlineVelocity()

Eigen::MatrixXd reducedSteadyNS::setOnlineVelocity ( Eigen::MatrixXd vel )

Sets the online velocity.

Parameters

[in] vel The velocity

Returns: The rescaled velocity vector

Definition at line 379 of file ReducedSteadyNS.C.

◆ solveOnline_PPE()

void reducedSteadyNS::solveOnline_PPE ( Eigen::MatrixXd vel_now )

Method to perform an online solve using a PPE stabilisation method.

Parameters

[in] vel_now The vector of online velocity. It is defined in with an Eigen::MatrixXd and must have one col and as many rows as the number of parametrized boundary conditions.

Definition at line 139 of file ReducedSteadyNS.C.

◆ solveOnline_sup()

void reducedSteadyNS::solveOnline_sup ( Eigen::MatrixXd vel_now )

Method to perform an online solve using a supremizer stabilisation method.

Parameters

[in] vel_now The vector of online velocity. It is defined in with an Eigen::MatrixXd and must have one col and as many rows as the number of parametrized boundary conditions.

Definition at line 146 of file ReducedSteadyNS.C.

Member Data Documentation

◆ count_online_solve

int reducedSteadyNS::count_online_solve = 1

Counter to count the online solutions.

Definition at line 170 of file ReducedSteadyNS.H.

◆ fN

Eigen::MatrixXd reducedSteadyNS::fN

Reduced matrix for normal forces.

Definition at line 113 of file ReducedSteadyNS.H.

◆ fTau

Eigen::MatrixXd reducedSteadyNS::fTau

Reduced matrix for tangent forces.

Definition at line 110 of file ReducedSteadyNS.H.

◆ N_BC

int reducedSteadyNS::N_BC

Number of parametrized boundary conditions.

Definition at line 167 of file ReducedSteadyNS.H.

◆ newton_object

newton_steadyNS reducedSteadyNS::newton_object

Newton object used to solve the non linear problem.

Definition at line 152 of file ReducedSteadyNS.H.

◆ Nphi_p

int reducedSteadyNS::Nphi_p

Number of pressure modes.

Definition at line 161 of file ReducedSteadyNS.H.

◆ Nphi_sup

int reducedSteadyNS::Nphi_sup

Number of supremizer modes.

Definition at line 164 of file ReducedSteadyNS.H.

◆ Nphi_u

int reducedSteadyNS::Nphi_u

Number of velocity modes.

Definition at line 158 of file ReducedSteadyNS.H.

◆ nu

scalar reducedSteadyNS::nu

Reduced viscosity in case of parametrized viscosity.

Definition at line 122 of file ReducedSteadyNS.H.

◆ online_solution

List< Eigen::MatrixXd> reducedSteadyNS::online_solution

List of Eigen matrices to store the online solution.

Definition at line 125 of file ReducedSteadyNS.H.

◆ para

ITHACAparameters* reducedSteadyNS::para

parameters to be read from the ITHACAdict file

Definition at line 104 of file ReducedSteadyNS.H.

◆ Pmodes

PtrList<volScalarField> reducedSteadyNS::Pmodes

List of pointers to store the modes for pressure.

Definition at line 131 of file ReducedSteadyNS.H.

◆ PREC

PtrList<volScalarField> reducedSteadyNS::PREC

Reconstructed pressure field.

Definition at line 140 of file ReducedSteadyNS.H.

◆ pRecFields

PtrList<volScalarField> reducedSteadyNS::pRecFields

Reconstructed pressure fields list.

Definition at line 146 of file ReducedSteadyNS.H.

◆ problem

steadyNS* reducedSteadyNS::problem

Pointer to the FOM problem.

Definition at line 155 of file ReducedSteadyNS.H.

◆ Psnapshots

PtrList<volScalarField> reducedSteadyNS::Psnapshots

List of pointers to store the snapshots for pressure.

Definition at line 137 of file ReducedSteadyNS.H.

◆ tauU

Eigen::MatrixXd reducedSteadyNS::tauU

Penalty Factor.

Definition at line 173 of file ReducedSteadyNS.H.

◆ Umodes

PtrList<volVectorField> reducedSteadyNS::Umodes

List of pointers to store the modes for velocity.

Definition at line 128 of file ReducedSteadyNS.H.

◆ UREC

PtrList<volVectorField> reducedSteadyNS::UREC

Recontructed velocity field.

Definition at line 143 of file ReducedSteadyNS.H.

◆ uRecFields

PtrList<volVectorField> reducedSteadyNS::uRecFields

Recontructed velocity fields list.

Definition at line 149 of file ReducedSteadyNS.H.

◆ Usnapshots

PtrList<volVectorField> reducedSteadyNS::Usnapshots

List of pointers to store the snapshots for velocity.

Definition at line 134 of file ReducedSteadyNS.H.

◆ vel_now

Eigen::MatrixXd reducedSteadyNS::vel_now

Online inlet velocity vector.

Definition at line 107 of file ReducedSteadyNS.H.

◆ y

Eigen::VectorXd reducedSteadyNS::y

Vector to store the solution during the Newton procedure.

Definition at line 119 of file ReducedSteadyNS.H.

◆ y_old

Eigen::VectorXd reducedSteadyNS::y_old

Vector to store the previous solution during the Newton procedure.

Definition at line 116 of file ReducedSteadyNS.H.

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

/github/workspace/src/ITHACA_ROMPROBLEMS/ReducedSteadyNS/ReducedSteadyNS.H
/github/workspace/src/ITHACA_ROMPROBLEMS/ReducedSteadyNS/ReducedSteadyNS.C

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ reducedSteadyNS() [1/2]

◆ reducedSteadyNS() [2/2]

◆ ~reducedSteadyNS()

Member Function Documentation

◆ inf_sup_constant()

◆ reconstruct()

◆ reconstruct_PPE()

◆ reconstructLiftAndDrag()

◆ setOnlineVelocity()

◆ solveOnline_PPE()

◆ solveOnline_sup()

Member Data Documentation

◆ count_online_solve

◆ fN

◆ fTau

◆ N_BC

◆ newton_object

◆ Nphi_p

◆ Nphi_sup

◆ Nphi_u

◆ nu

◆ online_solution

◆ para

◆ Pmodes

◆ PREC

◆ pRecFields

◆ problem

◆ Psnapshots

◆ tauU

◆ Umodes

◆ UREC

◆ uRecFields

◆ Usnapshots

◆ vel_now

◆ y

◆ y_old