surfacetensionbc.h

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/*
 *
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef surfacetensionbc_h
#define surfacetensionbc_h
 
#include "activebc.h"
 
#include <utility>
#include <list>


#define _IFT_SurfaceTensionBoundaryCondition_Name "surfacetension"
#define _IFT_SurfaceTensionBoundaryCondition_gamma "gamma"
#define _IFT_SurfaceTensionBoundaryCondition_useTangent "usetangent"
 
namespace oofem {
class Element;

class OOFEM_EXPORT SurfaceTensionBoundaryCondition : public ActiveBoundaryCondition
{
    double gamma; 
    bool useTangent; 
 
public:
    SurfaceTensionBoundaryCondition(int n, Domain * d) : ActiveBoundaryCondition(n, d) { }
    virtual ~SurfaceTensionBoundaryCondition() { }
 
    void initializeFrom(InputRecord &ir) override;
 
    void assemble(SparseMtrx &answer, TimeStep *tStep,
                  CharType type, const UnknownNumberingScheme &r_s, const UnknownNumberingScheme &c_s, double scale = 1.0, void*lock=nullptr) override;
 
    void assembleVector(FloatArray &answer, TimeStep *tStep,
                        CharType type, ValueModeType mode,
                        const UnknownNumberingScheme &s, 
                        FloatArray *eNorms=nullptr,
                        void*lock=nullptr) override;
 
    void giveLocationArrays(std :: vector< IntArray > &rows, std :: vector< IntArray > &cols, CharType type,
                            const UnknownNumberingScheme &r_s, const UnknownNumberingScheme &c_s) override;
 
    const char *giveClassName() const override { return "SurfaceTensionBoundaryCondition"; }
    const char *giveInputRecordName() const override { return _IFT_SurfaceTensionBoundaryCondition_Name; }
 
protected:
    void computeLoadVectorFromElement(FloatArray &answer, Element *e, int side, TimeStep *tStep);
    void computeTangentFromElement(FloatMatrix &answer, Element *e, int side, TimeStep *tStep);
};
} // end namespace oofem
#endif // surfacetensionbc_h