#include <bilininteg.hpp>

Inheritance diagram for mfem::DiffusionIntegrator:

Collaboration diagram for mfem::DiffusionIntegrator:

Public Member Functions
	DiffusionIntegrator ()
	Construct a diffusion integrator with coefficient Q = 1. More...

	DiffusionIntegrator (Coefficient &q)
	Construct a diffusion integrator with a scalar coefficient q. More...

	DiffusionIntegrator (MatrixCoefficient &q)
	Construct a diffusion integrator with a matrix coefficient q. More...

virtual void	AssembleElementMatrix (const FiniteElement &el, ElementTransformation &Trans, DenseMatrix &elmat)

virtual void	AssembleElementMatrix2 (const FiniteElement &trial_fe, const FiniteElement &test_fe, ElementTransformation &Trans, DenseMatrix &elmat)

virtual void	AssembleElementVector (const FiniteElement &el, ElementTransformation &Tr, const Vector &elfun, Vector &elvect)
	Perform the local action of the BilinearFormIntegrator. More...

virtual void	ComputeElementFlux (const FiniteElement &el, ElementTransformation &Trans, Vector &u, const FiniteElement &fluxelem, Vector &flux, int with_coef=1)
	Virtual method required for Zienkiewicz-Zhu type error estimators. More...

virtual double	ComputeFluxEnergy (const FiniteElement &fluxelem, ElementTransformation &Trans, Vector &flux, Vector *d_energy=NULL)
	Virtual method required for Zienkiewicz-Zhu type error estimators. More...

virtual void	AssemblePA (const FiniteElementSpace &)
	Method defining partial assembly. More...

virtual void	AddMultPA (const Vector &, Vector &) const
	Method for partially assembled action. More...

Public Member Functions inherited from mfem::BilinearFormIntegrator
virtual void	AddMultTransposePA (const Vector &x, Vector &y) const
	Method for partially assembled transposed action. More...

virtual void	AssembleFaceMatrix (const FiniteElement &el1, const FiniteElement &el2, FaceElementTransformations &Trans, DenseMatrix &elmat)

virtual void	AssembleFaceMatrix (const FiniteElement &trial_face_fe, const FiniteElement &test_fe1, const FiniteElement &test_fe2, FaceElementTransformations &Trans, DenseMatrix &elmat)

virtual void	AssembleElementGrad (const FiniteElement &el, ElementTransformation &Tr, const Vector &elfun, DenseMatrix &elmat)
	Assemble the local gradient matrix. More...

virtual void	AssembleFaceGrad (const FiniteElement &el1, const FiniteElement &el2, FaceElementTransformations &Tr, const Vector &elfun, DenseMatrix &elmat)
	Assemble the local action of the gradient of the NonlinearFormIntegrator resulting from a face integral term. More...

virtual	~BilinearFormIntegrator ()

Public Member Functions inherited from mfem::NonlinearFormIntegrator
void	SetIntRule (const IntegrationRule *ir)
	Prescribe a fixed IntegrationRule to use (when ir != NULL) or let the integrator choose (when ir == NULL). More...

void	SetIntegrationRule (const IntegrationRule &irule)
	Prescribe a fixed IntegrationRule to use. More...

virtual void	AssembleFaceVector (const FiniteElement &el1, const FiniteElement &el2, FaceElementTransformations &Tr, const Vector &elfun, Vector &elvect)
	Perform the local action of the NonlinearFormIntegrator resulting from a face integral term. More...

virtual double	GetElementEnergy (const FiniteElement &el, ElementTransformation &Tr, const Vector &elfun)
	Compute the local energy. More...

virtual	~NonlinearFormIntegrator ()

Static Public Member Functions
static const IntegrationRule &	GetRule (const FiniteElement &trial_fe, const FiniteElement &test_fe)

Protected Attributes
Coefficient *	Q

MatrixCoefficient *	MQ

Protected Attributes inherited from mfem::NonlinearFormIntegrator
const IntegrationRule *	IntRule

Additional Inherited Members
Protected Member Functions inherited from mfem::BilinearFormIntegrator
	BilinearFormIntegrator (const IntegrationRule *ir=NULL)

Protected Member Functions inherited from mfem::NonlinearFormIntegrator
	NonlinearFormIntegrator (const IntegrationRule *ir=NULL)

Detailed Description

Class for integrating the bilinear form a(u,v) := (Q grad u, grad v) where Q can be a scalar or a matrix coefficient.

Definition at line 1663 of file bilininteg.hpp.

Constructor & Destructor Documentation

mfem::DiffusionIntegrator::DiffusionIntegrator ( )

inline

Construct a diffusion integrator with coefficient Q = 1.

Definition at line 1684 of file bilininteg.hpp.

mfem::DiffusionIntegrator::DiffusionIntegrator ( Coefficient & q )

inline

Construct a diffusion integrator with a scalar coefficient q.

Definition at line 1687 of file bilininteg.hpp.

mfem::DiffusionIntegrator::DiffusionIntegrator ( MatrixCoefficient & q )

inline

Construct a diffusion integrator with a matrix coefficient q.

Definition at line 1691 of file bilininteg.hpp.

Member Function Documentation

void mfem::DiffusionIntegrator::AddMultPA	(	const Vector &	x,
		Vector &	y
	)		const

virtual

Method for partially assembled action.

Perform the action of integrator on the input x and add the result to the output y. Both x and y are E-vectors, i.e. they represent the element-wise discontinuous version of the FE space.

This method can be called only after the method AssemblePA() has been called.

Reimplemented from mfem::BilinearFormIntegrator.

Definition at line 1122 of file bilininteg_diffusion.cpp.

void mfem::DiffusionIntegrator::AssembleElementMatrix	(	const FiniteElement &	el,
		ElementTransformation &	Trans,
		DenseMatrix &	elmat
	)

virtual

Given a particular Finite Element computes the element stiffness matrix elmat.

Reimplemented from mfem::BilinearFormIntegrator.

Definition at line 384 of file bilininteg.cpp.

void mfem::DiffusionIntegrator::AssembleElementMatrix2	(	const FiniteElement &	trial_fe,
		const FiniteElement &	test_fe,
		ElementTransformation &	Trans,
		DenseMatrix &	elmat
	)

virtual

Given a trial and test Finite Element computes the element stiffness matrix elmat.

Reimplemented from mfem::BilinearFormIntegrator.

Definition at line 434 of file bilininteg.cpp.

void mfem::DiffusionIntegrator::AssembleElementVector	(	const FiniteElement &	el,
		ElementTransformation &	Tr,
		const Vector &	elfun,
		Vector &	elvect
	)

virtual

Perform the local action of the BilinearFormIntegrator.

Reimplemented from mfem::BilinearFormIntegrator.

Definition at line 493 of file bilininteg.cpp.

void mfem::DiffusionIntegrator::AssemblePA ( const FiniteElementSpace & fes )

virtual

Method defining partial assembly.

The result of the partial assembly is stored internally so that it can be used later in the methods AddMultPA() and AddMultTransposePA().

Reimplemented from mfem::BilinearFormIntegrator.

Definition at line 192 of file bilininteg_diffusion.cpp.

void mfem::DiffusionIntegrator::ComputeElementFlux	(	const FiniteElement &	el,
		ElementTransformation &	Trans,
		Vector &	u,
		const FiniteElement &	fluxelem,
		Vector &	flux,
		int	with_coef = `1`
	)

virtual

Virtual method required for Zienkiewicz-Zhu type error estimators.

The purpose of the method is to compute a local "flux" finite element function given a local finite element solution. The "flux" function has to be computed in terms of its coefficients (represented by the Vector flux) which multiply the basis functions defined by the FiniteElement fluxelem. Typically, the "flux" function will have more than one component and consequently flux should be store the coefficients of all components: first all coefficient for component 0, then all coefficients for component 1, etc. What the "flux" function represents depends on the specific integrator. For example, in the case of DiffusionIntegrator, the flux is the gradient of the solution multiplied by the diffusion coefficient.

Parameters

[in]	el	FiniteElement of the solution.
[in]	Trans	The ElementTransformation describing the physical position of the mesh element.
[in]	u	Solution coefficients representing the expansion of the solution function in the basis of el.
[in]	fluxelem	FiniteElement of the "flux".
[out]	flux	"Flux" coefficients representing the expansion of the "flux" function in the basis of fluxelem. The size of flux as a Vector has to be set by this method, e.g. using Vector::SetSize().
[in]	with_coef	If zero (the default value is 1) the implementation of the method may choose not to scale the "flux" function by any coefficients describing the integrator.

Reimplemented from mfem::BilinearFormIntegrator.

Definition at line 549 of file bilininteg.cpp.

double mfem::DiffusionIntegrator::ComputeFluxEnergy	(	const FiniteElement &	fluxelem,
		ElementTransformation &	Trans,
		Vector &	flux,
		Vector *	d_energy = `NULL`
	)

virtual

Virtual method required for Zienkiewicz-Zhu type error estimators.

The purpose of this method is to compute a local number that measures the energy of a given "flux" function (see ComputeElementFlux() for a description of the "flux" function). Typically, the energy of a "flux" function should be equal to a_local(u,u), if the "flux" is defined from a solution u; here a_local(.,.) denotes the element-local bilinear form represented by the integrator.

Parameters

[in]	fluxelem	FiniteElement of the "flux".
[in]	Trans	The ElementTransformation describing the physical position of the mesh element.
[in]	flux	"Flux" coefficients representing the expansion of the "flux" function in the basis of fluxelem.
[out]	d_energy	If not NULL, the given Vector should be set to represent directional energy split that can be used for anisotropic error estimation.

Returns: The computed energy.

Reimplemented from mfem::BilinearFormIntegrator.

Definition at line 607 of file bilininteg.cpp.

const IntegrationRule & mfem::DiffusionIntegrator::GetRule	(	const FiniteElement &	trial_fe,
		const FiniteElement &	test_fe
	)

static

Definition at line 673 of file bilininteg.cpp.

Member Data Documentation

MatrixCoefficient* mfem::DiffusionIntegrator::MQ

protected

Definition at line 1667 of file bilininteg.hpp.

Coefficient* mfem::DiffusionIntegrator::Q

protected

Definition at line 1666 of file bilininteg.hpp.

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

Public Member Functions

Static Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation