CrankNicolson.H

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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.
 
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    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::sixDoFSolvers::CrankNicolson
 
Description
    Crank-Nicolson 2nd-order time-integrator for 6DoF solid-body motion.
 
    The off-centering coefficients for acceleration (velocity integration) and
    velocity (position/orientation integration) may be specified but default
    values of 0.5 for each are used if they are not specified.  With the default
    off-centering this scheme is equivalent to the Newmark scheme with default
    coefficients.
 
    Example specification in dynamicMeshDict:
    \verbatim
    solver
    {
        type    CrankNicolson;
        aoc     0.5;    // Acceleration off-centering coefficient
        voc     0.5;    // Velocity off-centering coefficient
    }
    \endverbatim
 
See also
    Foam::sixDoFSolvers::Newmark
 
SourceFiles
    CrankNicolson.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef CrankNicolson_H
#define CrankNicolson_H
 
#include "sixDoFSolver.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace sixDoFSolvers
{
 
/*---------------------------------------------------------------------------*\
                        Class CrankNicolson Declaration
\*---------------------------------------------------------------------------*/
 
class CrankNicolson
:
    public sixDoFSolver
{
    // Private Data
 
        //- Acceleration off-centering coefficient (default: 0.5)
        const scalar aoc_;
 
        //- Velocity off-centering coefficient (default: 0.5)
        const scalar voc_;
 
 
public:
 
    //- Runtime type information
    TypeName("CrankNicolson");
 
 
    // Constructors
 
        //- Construct from a dictionary and the body
        CrankNicolson
        (
            const dictionary& dict,
            sixDoFRigidBodyMotion& body
        );
 
 
    //- Destructor
    virtual ~CrankNicolson();
 
 
    // Member Functions
 
        //- Drag coefficient
        virtual void solve
        (
            bool firstIter,
            const vector& fGlobal,
            const vector& tauGlobal,
            scalar deltaT,
            scalar deltaT0
        );
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace sixDoFSolvers
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //