Target trim forces/coefficients. More...
Public Member Functions  
TypeName ("targetCoeffTrim")  
Runtime 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")  
Runtime 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_ 
Underrelaxation 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...  
Target trim forces/coefficients.
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 NewtonRaphson iterative method. The solver tolerance can be userinput, 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 = userinput conversion coefficient (default = 1) rho = density omega = rotor angular velocity pi = mathematical pi
Definition at line 87 of file targetCoeffTrim.H.
targetCoeffTrim  (  const fv::rotorDiskSource &  rotor, 
const dictionary &  dict  
) 
Constructor.
Definition at line 194 of file targetCoeffTrim.C.
References Foam::read().
Referenced by targetCoeffTrim::correctTrim().

virtual 
Destructor.
Definition at line 216 of file targetCoeffTrim.C.

protected 
Calculate the rotor force and moment coefficients vector.

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().
TypeName  (  "targetCoeffTrim"  ) 
Runtime type information.

virtual 
Read.
Reimplemented from trimModel.
Definition at line 222 of file targetCoeffTrim.C.
References Foam::degToRad(), dictionary::lookupOrDefault(), and trimModel::read().

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.

virtual 
Correct the model.
Implements trimModel.
Definition at line 276 of file targetCoeffTrim.C.
Referenced by targetCoeffTrim::thetag().

virtual 
Correct the model for compressible flow.
Implements trimModel.
Definition at line 286 of file targetCoeffTrim.C.
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.

protected 
Number of iterations between calls to 'correct'.
Definition at line 97 of file targetCoeffTrim.H.

protected 
Flag to indicate whether to solve coeffs (true) or forces (false)
Definition at line 100 of file targetCoeffTrim.H.

protected 
Target coefficient vector (thrust force, roll moment, pitch moment)
Definition at line 103 of file targetCoeffTrim.H.

protected 
Pitch angles (collective, roll, pitch) [rad].
Definition at line 106 of file targetCoeffTrim.H.

protected 
Maximum number of iterations in trim routine.
Definition at line 109 of file targetCoeffTrim.H.

protected 
Convergence tolerance.
Definition at line 112 of file targetCoeffTrim.H.

protected 
Underrelaxation coefficient.
Definition at line 115 of file targetCoeffTrim.H.

protected 
Perturbation angle used to determine jacobian.
Definition at line 118 of file targetCoeffTrim.H.

protected 
Coefficient to allow for conversion between US and EU definitions.
Definition at line 121 of file targetCoeffTrim.H.