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

#include <ReducedUnsteadyNSExplicit.H>

Inheritance diagram for ReducedUnsteadyNSExplicit:

Public Member Functions
	ReducedUnsteadyNSExplicit ()
	Construct Null.

	ReducedUnsteadyNSExplicit (UnsteadyNSExplicit &problem)
	Construct Null.

	~ReducedUnsteadyNSExplicit ()

void	solveOnline (Eigen::MatrixXd vel_now, label startSnap=0)
	Method to perform an online solve without a pressure stabilisation method.

void	reconstruct (bool exportFields=false, fileName folder="./online_rec")
	Method to reconstruct the solutions from an online solve with a supremizer stabilisation technique.

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

	reducedUnsteadyNS (unsteadyNS &problem)
	Construct Null.

	~reducedUnsteadyNS ()

Eigen::MatrixXd	penalty_PPE (Eigen::MatrixXd &vel_now, Eigen::MatrixXd &tauIter, int startSnap=0)
	Method to determine the penalty factors iteratively.

Eigen::MatrixXd	penalty_sup (Eigen::MatrixXd &vel_now, Eigen::MatrixXd &tauIter, int startSnap=0)
	Method to determine the penalty factors iteratively.

void	solveOnline_PPE (Eigen::MatrixXd vel_now, int startSnap=0)
	Method to perform an online solve using a PPE stabilisation method.

void	solveOnline_sup (Eigen::MatrixXd vel_now, int startSnap=0)
	Method to perform an online solve using a supremizer stabilisation method.

void	reconstruct (bool exportFields=false, fileName folder="./online_rec")
	Method to reconstruct the solutions from an online solve with a supremizer stabilisation technique.

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

Public Member Functions inherited from reducedSteadyNS
	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
UnsteadyNSExplicit *	problem
	Pointer to the FOM problem.

Public Attributes inherited from reducedUnsteadyNS
newton_unsteadyNS_sup	newton_object_sup
	Function object to call the non linear solver sup approach.

newton_unsteadyNS_PPE	newton_object_PPE
	Function object to call the non linear solver PPE approach.

scalar	time
	Scalar to store the current time.

double	dt
	Scalar to store the time increment.

scalar	finalTime
	Scalar to store the final time if the online simulation.

scalar	tstart
	Scalar to store the initial time if the online simulation.

double	storeEvery
	A variable for storing the reduced coefficients.

double	exportEvery
	A variable for exporting the fields.

bool	startFromZero = false
	A variable for starting solving the reduced system from zero or not.

int	timeStepPenalty = 1
	Number of timesteps calculated for the iterative penalty method.

Eigen::MatrixXd	tauIter
	Penalty Factor determined with iterative solver.

scalar	maxIterPenalty
	Maximum number of iterations to be done for the computation of the penalty factor.

scalar	tolerancePenalty
	Tolerance for the residual of the boundary values, there is the same tolerance for velocity and temperature.

unsteadyNS *	problem
	Pointer to the FOM problem.

Public Attributes inherited from reducedSteadyNS
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 unsteady Navier-stokes problem.

This class must be used together with the steadyNS class

Examples: 19UnsteadyNSExplicit.C.

Definition at line 56 of file ReducedUnsteadyNSExplicit.H.

Constructor & Destructor Documentation

◆ ReducedUnsteadyNSExplicit() [1/2]

ReducedUnsteadyNSExplicit::ReducedUnsteadyNSExplicit ( )

Construct Null.

Definition at line 41 of file ReducedUnsteadyNSExplicit.C.

◆ ReducedUnsteadyNSExplicit() [2/2]

ReducedUnsteadyNSExplicit::ReducedUnsteadyNSExplicit ( UnsteadyNSExplicit & problem )

explicit

Construct Null.

Parameters

problem a full order UnsteadyNSExplicit problem

Definition at line 45 of file ReducedUnsteadyNSExplicit.C.

◆ ~ReducedUnsteadyNSExplicit()

ReducedUnsteadyNSExplicit::~ReducedUnsteadyNSExplicit ( )

inline

Definition at line 70 of file ReducedUnsteadyNSExplicit.H.

Member Function Documentation

◆ reconstruct()

void ReducedUnsteadyNSExplicit::reconstruct	(	bool	exportFields = false,
		fileName	folder = "./online_rec" )

Method to reconstruct the solutions from an online solve with a supremizer stabilisation technique.

stabilisation method

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

Definition at line 313 of file ReducedUnsteadyNSExplicit.C.

◆ solveOnline()

void ReducedUnsteadyNSExplicit::solveOnline	(	Eigen::MatrixXd	vel_now,
		label	startSnap = 0 )

Method to perform an online solve without a pressure 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.
[in]	startSnap	The first snapshot taken from the offline snapshots and used to get the reduced initial condition.

Definition at line 57 of file ReducedUnsteadyNSExplicit.C.

Member Data Documentation

◆ problem

UnsteadyNSExplicit* ReducedUnsteadyNSExplicit::problem

Pointer to the FOM problem.

Definition at line 73 of file ReducedUnsteadyNSExplicit.H.

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

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

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ReducedUnsteadyNSExplicit() [1/2]

◆ ReducedUnsteadyNSExplicit() [2/2]

◆ ~ReducedUnsteadyNSExplicit()

Member Function Documentation

◆ reconstruct()

◆ solveOnline()

Member Data Documentation

◆ problem