/usr/include/liggghts/cohesion_model_sjkr.h is in libliggghts-dev 3.7.0+repack1-1.
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This is the
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╚══════╝╚═╝ ╚═════╝ ╚═════╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚══════╝®
DEM simulation engine, released by
DCS Computing Gmbh, Linz, Austria
http://www.dcs-computing.com, office@dcs-computing.com
LIGGGHTS® is part of CFDEM®project:
http://www.liggghts.com | http://www.cfdem.com
Core developer and main author:
Christoph Kloss, christoph.kloss@dcs-computing.com
LIGGGHTS® is open-source, distributed under the terms of the GNU Public
License, version 2 or later. It 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. You should have
received a copy of the GNU General Public License along with LIGGGHTS®.
If not, see http://www.gnu.org/licenses . See also top-level README
and LICENSE files.
LIGGGHTS® and CFDEM® are registered trade marks of DCS Computing GmbH,
the producer of the LIGGGHTS® software and the CFDEM®coupling software
See http://www.cfdem.com/terms-trademark-policy for details.
-------------------------------------------------------------------------
Contributing author and copyright for this file:
Christoph Kloss (DCS Computing GmbH, Linz)
Christoph Kloss (JKU Linz)
Richard Berger (JKU Linz)
Copyright 2012- DCS Computing GmbH, Linz
Copyright 2009-2012 JKU Linz
------------------------------------------------------------------------- */
#ifdef COHESION_MODEL
COHESION_MODEL(COHESION_SJKR,sjkr,1)
#else
#ifndef COHESION_MODEL_SJKR_H_
#define COHESION_MODEL_SJKR_H_
#include "contact_models.h"
#include "cohesion_model_base.h"
#include <math.h>
namespace LIGGGHTS {
namespace ContactModels {
using namespace std;
using namespace LAMMPS_NS;
template<>
class CohesionModel<COHESION_SJKR> : public CohesionModelBase {
public:
CohesionModel(LAMMPS * lmp, IContactHistorySetup * hsetup, class ContactModelBase * c) :
CohesionModelBase(lmp, hsetup, c),
cohEnergyDens(NULL)
{
}
void registerSettings(Settings& settings)
{
settings.registerOnOff("tangential_reduce",tangentialReduce_,false);
}
inline void postSettings(IContactHistorySetup * hsetup, ContactModelBase *cmb) {}
void connectToProperties(PropertyRegistry & registry)
{
registry.registerProperty("cohEnergyDens", &MODEL_PARAMS::createCohesionEnergyDensity);
registry.connect("cohEnergyDens", cohEnergyDens,"cohesion_model sjkr");
// error checks on coarsegraining
if(force->cg_active())
error->cg(FLERR,"cohesion model sjkr");
}
void surfacesIntersect(SurfacesIntersectData & sidata, ForceData & i_forces, ForceData & j_forces)
{
//r is the distance between the sphere's centers
const double r = sidata.r;
const double ri = sidata.radi;
const double rj = sidata.radj;
double Acont;
if(sidata.is_wall)
Acont = (ri*ri-r*r)*M_PI*sidata.area_ratio; //contact area sphere-wall
else
Acont = - M_PI/4 * ( (r-ri-rj)*(r+ri-rj)*(r-ri+rj)*(r+ri+rj) )/(r*r); //contact area of the two spheres
const double Fn_coh = -cohEnergyDens[sidata.itype][sidata.jtype]*Acont;
if(tangentialReduce_) sidata.Fn += Fn_coh;
if(sidata.contact_flags) *sidata.contact_flags |= CONTACT_COHESION_MODEL;
// apply normal force
if(sidata.is_wall) {
const double Fn_ = Fn_coh * sidata.area_ratio;
i_forces.delta_F[0] += Fn_ * sidata.en[0];
i_forces.delta_F[1] += Fn_ * sidata.en[1];
i_forces.delta_F[2] += Fn_ * sidata.en[2];
} else {
const double fx = Fn_coh * sidata.en[0];
const double fy = Fn_coh * sidata.en[1];
const double fz = Fn_coh * sidata.en[2];
i_forces.delta_F[0] += fx;
i_forces.delta_F[1] += fy;
i_forces.delta_F[2] += fz;
j_forces.delta_F[0] -= fx;
j_forces.delta_F[1] -= fy;
j_forces.delta_F[2] -= fz;
}
}
inline void endSurfacesIntersect(SurfacesIntersectData &sidata, ForceData&, ForceData&) {}
void beginPass(SurfacesIntersectData&, ForceData&, ForceData&){}
void endPass(SurfacesIntersectData&, ForceData&, ForceData&){}
void surfacesClose(SurfacesCloseData& scdata, ForceData&, ForceData&)
{
if(scdata.contact_flags) *scdata.contact_flags &= ~CONTACT_COHESION_MODEL;
}
private:
double ** cohEnergyDens;
bool tangentialReduce_;
};
}
}
#endif // COHESION_MODEL_SJKR_H_
#endif
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