softWall.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2019 OpenCFD Ltd.
-------------------------------------------------------------------------------
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
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    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::softWall
 
Group
    grpRigidBodyDynamicsRestraints
 
Description
    Soft wall is a Damper-Linear spring restraint.  Acts as a "soft" wall
    when the distance between 'anchor' and 'refAttachmentPt' in the
    wallNormal direction becomes negative.
 
    A system of spring-damper is activated to simulate a soft collision
    de-acceleration.
 
 
SourceFiles
    softWall.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef RBD_restraints_softWall_H
#define RBD_restraints_softWall_H
 
#include "rigidBodyRestraint.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace RBD
{
namespace restraints
{
 
/*---------------------------------------------------------------------------*\
                          Class softWall Declaration
\*---------------------------------------------------------------------------*/
 
class softWall
:
    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_;
 
        //- Damping factor
        scalar psi_;
 
        //- Damping coefficient [1/sec]
        scalar C_;
 
        //- Wall normal
        vector wallNormal_;
 
 
public:
 
    //- Runtime type information
    TypeName("softWall");
 
 
    // Constructors
 
        //- Construct from components
        softWall
        (
            const word& name,
            const dictionary& dict,
            const rigidBodyModel& model
        );
 
        //- Construct and return a clone
        virtual autoPtr<restraint> clone() const
        {
            return autoPtr<restraint>
            (
                new softWall(*this)
            );
        }
 
 
    //- Destructor
    virtual ~softWall();
 
 
    // Member Functions
 
 
        // Restrain forces
        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
 
// ************************************************************************* //