fix_rigid_surface_constraint.h

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// Parallel Finite Element-General Geometry Ewald-like Method.
// Copyright (C) 2015-2016 Xujun Zhao, Jiyuan Li, Xikai Jiang

// This code 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 2.1 of the License, or (at your option) any later version.


// This code 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 General Public
// License along with this code; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


#pragma once

#include "fix_rigid.h"
namespace libMesh
{

class FixRigidSurfaceConstraint : public FixRigid
{
public:
    FixRigidSurfaceConstraint(PMLinearImplicitSystem& pm_sys);

    ~FixRigidSurfaceConstraint(){};

    void print_fix();

    void initParams();

    void compute();

private:
    void compute_constraint_force(const std::size_t& i,
                                  std::vector<Point>& nodal_force);
    // surface spring constant
    Real surface_spring_constant;

    // center spring constant
    Real center_spring_constant;
};

}