1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright held by original author
7 -------------------------------------------------------------------------------
9 This file is part of OpenFOAM.
11 OpenFOAM is free software; you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by the
13 Free Software Foundation; either version 2 of the License, or (at your
14 option) any later version.
16 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 You should have received a copy of the GNU General Public License
22 along with OpenFOAM; if not, write to the Free Software Foundation,
23 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 \*---------------------------------------------------------------------------*/
27 #include "harmonicSpring.H"
28 #include "addToRunTimeSelectionTable.H"
30 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
34 namespace tetherPotentials
37 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
39 defineTypeNameAndDebug(harmonicSpring, 0);
41 addToRunTimeSelectionTable
49 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
51 harmonicSpring::harmonicSpring
54 const dictionary& tetherPotentialProperties
57 tetherPotential(name, tetherPotentialProperties),
60 tetherPotentialProperties.subDict(typeName + "Coeffs")
62 springConstant_(readScalar(harmonicSpringCoeffs_.lookup("springConstant")))
66 // * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
68 scalar harmonicSpring::energy(const vector r) const
70 return 0.5*springConstant_*magSqr(r);
74 vector harmonicSpring::force(const vector r) const
76 return -springConstant_*r;
80 bool harmonicSpring::read(const dictionary& tetherPotentialProperties)
82 tetherPotential::read(tetherPotentialProperties);
84 harmonicSpringCoeffs_ =
85 tetherPotentialProperties.subDict(typeName + "Coeffs");
87 harmonicSpringCoeffs_.lookup("springConstant") >> springConstant_;
93 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
95 } // End namespace tetherPotentials
96 } // End namespace Foam
98 // ************************************************************************* //