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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2016-2025 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
Foam::RBD::restraints::linearSpring
Description
Linear spring restraint.
SourceFiles
linearSpring.C
\*---------------------------------------------------------------------------*/
#ifndef linearSpring_RBD_restraint_H
#define linearSpring_RBD_restraint_H
#include "rigidBodyRestraint.H"
#include "Switch.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace RBD
{
namespace restraints
{
/*---------------------------------------------------------------------------*\
Class linearSpring Declaration
\*---------------------------------------------------------------------------*/
class linearSpring
:
public restraint
{
// Private Data
//- Anchor point, where the spring is attached to an immovable
// object
point anchor_;
//- Reference point of attachment to the solid body
point refAttachmentPt_;
//- Spring stiffness coefficient [N/m]
scalar stiffness_;
//- Damping coefficient [Ns/m]
scalar damping_;
//- Rest length - length of spring when no forces are applied to it
scalar restLength_;
//- Switch to allow no restraint when line is shorter than restLength
Switch allowSlack_;
public:
//- Runtime type information
TypeName("linearSpring");
// Constructors
//- Construct from components
linearSpring
(
const word& name,
const dictionary& dict,
const rigidBodyModel& model
);
//- Construct and return a clone
virtual autoPtr<restraint> clone() const
{
return autoPtr<restraint>
(
new linearSpring(*this)
);
}
//- Destructor
virtual ~linearSpring();
// Member Functions
//- Accumulate the retraint internal joint forces into the tau field and
// external forces into the fx field
virtual void restrain
(
scalarField& tau,
Field<spatialVector>& fx,
const rigidBodyModelState& state
) const;
//- Update properties from given dictionary
virtual bool read(const dictionary& dict);
//- Write
virtual void write(Ostream&) const;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace restraints
} // End namespace RBD
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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