Target trim forces/coefficients. More...

Inheritance diagram for targetCoeffTrim:

Collaboration diagram for targetCoeffTrim:

Public Member Functions
	TypeName ("targetCoeffTrim")
	Run-time type information. More...

	targetCoeffTrim (const fv::rotorDiskSource &rotor, const dictionary &dict)
	Constructor. More...

virtual	~targetCoeffTrim ()
	Destructor. More...

void	read (const dictionary &dict)
	Read. More...

virtual tmp< scalarField >	thetag () const
	Return the geometric angle of attack [rad]. More...

virtual void	correct (const vectorField &U, vectorField &force)
	Correct the model. More...

virtual void	correct (const volScalarField rho, const vectorField &U, vectorField &force)
	Correct the model for compressible flow. More...

template<class RhoFieldType >
Foam::vector	calcCoeffs (const RhoFieldType &rho, const vectorField &U, const scalarField &thetag, vectorField &force) const

Public Member Functions inherited from trimModel
	TypeName ("trimModel")
	Run-time type information. More...

	declareRunTimeSelectionTable (autoPtr, trimModel, dictionary,(const fv::rotorDiskSource &rotor, const dictionary &dict),(rotor, dict))

	trimModel (const fv::rotorDiskSource &rotor, const dictionary &dict, const word &name)
	Construct from components. More...

virtual	~trimModel ()
	Destructor. More...

Protected Member Functions
template<class RhoFieldType >
vector	calcCoeffs (const RhoFieldType &rho, const vectorField &U, const scalarField &alphag, vectorField &force) const
	Calculate the rotor force and moment coefficients vector. More...

template<class RhoFieldType >
void	correctTrim (const RhoFieldType &rho, const vectorField &U, vectorField &force)
	Correct the model. More...

Protected Attributes
label	calcFrequency_
	Number of iterations between calls to 'correct'. More...

bool	useCoeffs_
	Flag to indicate whether to solve coeffs (true) or forces (false) More...

vector	target_
	Target coefficient vector (thrust force, roll moment, pitch moment) More...

vector	theta_
	Pitch angles (collective, roll, pitch) [rad]. More...

label	nIter_
	Maximum number of iterations in trim routine. More...

scalar	tol_
	Convergence tolerance. More...

scalar	relax_
	Under-relaxation coefficient. More...

scalar	dTheta_
	Perturbation angle used to determine jacobian. More...

scalar	alpha_
	Coefficient to allow for conversion between US and EU definitions. More...

Protected Attributes inherited from trimModel
const fv::rotorDiskSource &	rotor_
	Reference to the rotor source model. More...

const word	name_
	Name of model. More...

dictionary	coeffs_
	Coefficients dictionary. More...

Additional Inherited Members
Static Public Member Functions inherited from trimModel
static autoPtr< trimModel >	New (const fv::rotorDiskSource &rotor, const dictionary &dict)
	Return a reference to the selected trim model. More...

Detailed Description

Target trim forces/coefficients.

Solves:

c^old + J.d(theta) = c^target

Where:

n = time level c = coefficient vector (thrust force, roll moment, pitch moment) theta = pitch angle vector (collective, roll, pitch) J = Jacobian [3x3] matrix

The trimmed pitch angles are found via solving the above with a Newton-Raphson iterative method. The solver tolerance can be user-input, using the 'tol' entry.

If coefficients are requested (useCoeffs = true), the force and moments are normalised using:

force c = ——————————— alpha*pi*rho*(omega^2)*(radius^4)

and

moment c = ——————————— alpha*pi*rho*(omega^2)*(radius^5)

Where:

alpha = user-input conversion coefficient (default = 1) rho = desity omega = rotor angulr velocity pi = mathematical pi

Source files

Definition at line 87 of file targetCoeffTrim.H.

Constructor & Destructor Documentation

◆ targetCoeffTrim()

targetCoeffTrim	(	const fv::rotorDiskSource &	rotor,
		const dictionary &	dict
	)

Constructor.

Definition at line 194 of file targetCoeffTrim.C.

References Foam::read().

Referenced by targetCoeffTrim::correctTrim().

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◆ ~targetCoeffTrim()

~targetCoeffTrim ( )

virtual

Destructor.

Definition at line 216 of file targetCoeffTrim.C.

Member Function Documentation

◆ calcCoeffs() [1/2]

vector calcCoeffs	(	const RhoFieldType &	rho,
		const vectorField &	U,
		const scalarField &	alphag,
		vectorField &	force
	)		const

protected

Calculate the rotor force and moment coefficients vector.

◆ correctTrim()

void correctTrim	(	const RhoFieldType &	rho,
		const vectorField &	U,
		vectorField &	force
	)

protected

Correct the model.

Definition at line 100 of file targetCoeffTrim.C.

References Foam::endl(), Foam::Info, Foam::inv(), Foam::mag(), Foam::nl, Foam::radToDeg(), targetCoeffTrim::targetCoeffTrim(), Foam::type(), and Foam::Zero.

Referenced by targetCoeffTrim::calcCoeffs().

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◆ TypeName()

TypeName ( "targetCoeffTrim" )

Run-time type information.

◆ read()

void read ( const dictionary & dict )

virtual

Read.

Reimplemented from trimModel.

Definition at line 222 of file targetCoeffTrim.C.

References Foam::degToRad(), dictionary::lookupOrDefault(), trimModel::read(), and Foam::readScalar().

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◆ thetag()

Foam::tmp< Foam::scalarField > thetag ( ) const

virtual

Return the geometric angle of attack [rad].

Implements trimModel.

Definition at line 258 of file targetCoeffTrim.C.

References targetCoeffTrim::correct(), Foam::cos(), forAll, psi, tmp< T >::ref(), Foam::sin(), List< T >::size(), and x.

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◆ correct() [1/2]

void correct	(	const vectorField &	U,
		vectorField &	force
	)

virtual

Correct the model.

Implements trimModel.

Definition at line 276 of file targetCoeffTrim.C.

Referenced by targetCoeffTrim::thetag().

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◆ correct() [2/2]

void correct	(	const volScalarField	rho,
		const vectorField &	U,
		vectorField &	force
	)

virtual

Correct the model for compressible flow.

Implements trimModel.

Definition at line 286 of file targetCoeffTrim.C.

◆ calcCoeffs() [2/2]

Foam::vector calcCoeffs	(	const RhoFieldType &	rho,
		const vectorField &	U,
		const scalarField &	thetag,
		vectorField &	force
	)		const

Definition at line 46 of file targetCoeffTrim.C.

References C::C(), cells, targetCoeffTrim::correctTrim(), forAll, Foam::constant::mathematical::pi(), Foam::pow4(), Foam::reduce(), Foam::sqr(), x, and Foam::Zero.

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Member Data Documentation

◆ calcFrequency_

label calcFrequency_

protected

Number of iterations between calls to 'correct'.

Definition at line 97 of file targetCoeffTrim.H.

◆ useCoeffs_

bool useCoeffs_

protected

Flag to indicate whether to solve coeffs (true) or forces (false)

Definition at line 100 of file targetCoeffTrim.H.

◆ target_

vector target_

protected

Target coefficient vector (thrust force, roll moment, pitch moment)

Definition at line 103 of file targetCoeffTrim.H.

◆ theta_

vector theta_

protected

Pitch angles (collective, roll, pitch) [rad].

Definition at line 106 of file targetCoeffTrim.H.

◆ nIter_

label nIter_

protected

Maximum number of iterations in trim routine.

Definition at line 109 of file targetCoeffTrim.H.

◆ tol_

scalar tol_

protected

Convergence tolerance.

Definition at line 112 of file targetCoeffTrim.H.

◆ relax_

scalar relax_

protected

Under-relaxation coefficient.

Definition at line 115 of file targetCoeffTrim.H.

◆ dTheta_

scalar dTheta_

protected

Perturbation angle used to determine jacobian.

Definition at line 118 of file targetCoeffTrim.H.

◆ alpha_

scalar alpha_

protected

Coefficient to allow for conversion between US and EU definitions.

Definition at line 121 of file targetCoeffTrim.H.

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

src/fvOptions/sources/derived/rotorDiskSource/trimModel/targetCoeff/targetCoeffTrim.H
src/fvOptions/sources/derived/rotorDiskSource/trimModel/targetCoeff/targetCoeffTrim.C

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ targetCoeffTrim()

◆ ~targetCoeffTrim()

Member Function Documentation

◆ calcCoeffs() [1/2]

◆ correctTrim()

◆ TypeName()

◆ read()

◆ thetag()

◆ correct() [1/2]

◆ correct() [2/2]

◆ calcCoeffs() [2/2]

Member Data Documentation

◆ calcFrequency_

◆ useCoeffs_

◆ target_

◆ theta_

◆ nIter_

◆ tol_

◆ relax_

◆ dTheta_

◆ alpha_