/usr/include/liggghts/tangential_model_no_history.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 TANGENTIAL_MODEL
TANGENTIAL_MODEL(TANGENTIAL_NO_HISTORY,no_history,1)
#else
#ifndef TANGENTIAL_MODEL_NO_HISTORY_H_
#define TANGENTIAL_MODEL_NO_HISTORY_H_
#include "contact_models.h"
#include "tangential_model_base.h"
#include <algorithm>
#include <math.h>
#include "global_properties.h"
#include "fix_property_atom.h"
namespace LIGGGHTS {
namespace ContactModels
{
template<>
class TangentialModel<TANGENTIAL_NO_HISTORY> : public TangentialModelBase
{
public:
static const int MASK = CM_CONNECT_TO_PROPERTIES | CM_SURFACES_INTERSECT;
TangentialModel(LAMMPS * lmp, IContactHistorySetup *hsetup, class ContactModelBase *cmb) :
TangentialModelBase(lmp, hsetup, cmb),
coeffFrict(NULL),
disable_when_bonded_(false),
bond_history_offset_(-1),
dissipation_history_offset_(-1),
dissipatedflag_(false),
fix_dissipated_(NULL)
{
}
inline void registerSettings(Settings &settings)
{
settings.registerOnOff("disableTangentialWhenBonded", disable_when_bonded_, false);
settings.registerOnOff("computeDissipatedEnergy", dissipatedflag_, false);
}
inline void postSettings(IContactHistorySetup * hsetup, ContactModelBase *cmb)
{
if (disable_when_bonded_)
{
bond_history_offset_ = cmb->get_history_offset("bond_contactflag");
if (bond_history_offset_ < 0)
error->one(FLERR, "Could not find bond history offset");
}
if (dissipatedflag_)
{
if (cmb->is_wall())
{
fix_dissipated_ = static_cast<FixPropertyAtom*>(modify->find_fix_property("dissipated_energy_wall", "property/atom", "vector", 0, 0, "dissipated energy"));
dissipation_history_offset_ = cmb->get_history_offset("dissipation_force");
if (!dissipation_history_offset_)
error->one(FLERR, "Internal error: Could not find dissipation history offset");
}
else
fix_dissipated_ = static_cast<FixPropertyAtom*>(modify->find_fix_property("dissipated_energy", "property/atom", "vector", 0, 0, "dissipated energy"));
if (!fix_dissipated_)
error->one(FLERR, "Surface model has not registered dissipated_energy fix");
}
}
inline void connectToProperties(PropertyRegistry & registry){
registry.registerProperty("coeffFrict", &MODEL_PARAMS::createCoeffFrict);
registry.connect("coeffFrict", coeffFrict,"tangential_model history");
}
inline void surfacesIntersect(const SurfacesIntersectData & sidata, ForceData & i_forces, ForceData & j_forces) {
if(sidata.contact_flags) *sidata.contact_flags |= CONTACT_TANGENTIAL_MODEL;
const double xmu = coeffFrict[sidata.itype][sidata.jtype];
const double enx = sidata.en[0];
const double eny = sidata.en[1];
const double enz = sidata.en[2];
const double vrel = sqrt(sidata.vtr1*sidata.vtr1 + sidata.vtr2*sidata.vtr2 + sidata.vtr3*sidata.vtr3);
// force normalization
const double Ft_friction = xmu * fabs(sidata.Fn);
double gamma = 0.0;
if (Ft_friction < sidata.gammat*vrel)
gamma = Ft_friction/vrel;
else
gamma = sidata.gammat;
// tangential force due to tangential velocity damping
const double Ft1 = -gamma*sidata.vtr1;
const double Ft2 = -gamma*sidata.vtr2;
const double Ft3 = -gamma*sidata.vtr3;
// forces & torques
const double tor1 = (eny*Ft3 - enz*Ft2);
const double tor2 = (enz*Ft1 - enx*Ft3);
const double tor3 = (enx*Ft2 - eny*Ft1);
#ifdef NONSPHERICAL_ACTIVE_FLAG
double torque_i[3];
if(sidata.is_non_spherical) {
double xci[3];
double Ft_i[3] = { Ft1, Ft2, Ft3 };
vectorSubtract3D(sidata.contact_point, atom->x[sidata.i], xci);
vectorCross3D(xci, Ft_i, torque_i);
} else {
torque_i[0] = -sidata.cri * tor1;
torque_i[1] = -sidata.cri * tor2;
torque_i[2] = -sidata.cri * tor3;
}
#endif
// return resulting forces
if (!disable_when_bonded_ || sidata.contact_history[bond_history_offset_] < 0.5)
{
// energy balance terms
if (dissipatedflag_ && sidata.computeflag && sidata.shearupdate)
{
const double crj = sidata.is_wall ? 0.0 : sidata.crj;
// compute increment in dissipated energy
double * const * const dissipated = fix_dissipated_->array_atom;
double * const dissipated_i = dissipated[sidata.i];
double * const dissipated_j = dissipated[sidata.j];
dissipated_i[1] += -Ft1;
dissipated_i[2] += -Ft2;
dissipated_i[3] += -Ft3;
dissipated_i[4] += sidata.cri*tor1;
dissipated_i[5] += sidata.cri*tor2;
dissipated_i[6] += sidata.cri*tor3;
if (sidata.j < atom->nlocal && !sidata.is_wall)
{
dissipated_j[1] -= -Ft1;
dissipated_j[2] -= -Ft2;
dissipated_j[3] -= -Ft3;
dissipated_j[4] += crj*tor1;
dissipated_j[5] += crj*tor2;
dissipated_j[6] += crj*tor3;
}
else if (sidata.is_wall)
{
double * const diss_force = &sidata.contact_history[dissipation_history_offset_];
diss_force[0] -= -Ft1;
diss_force[1] -= -Ft2;
diss_force[2] -= -Ft3;
}
}
if(sidata.is_wall) {
const double area_ratio = sidata.area_ratio;
i_forces.delta_F[0] += Ft1 * area_ratio;
i_forces.delta_F[1] += Ft2 * area_ratio;
i_forces.delta_F[2] += Ft3 * area_ratio;
#ifdef NONSPHERICAL_ACTIVE_FLAG
i_forces.delta_torque[0] += torque_i[0] * area_ratio;
i_forces.delta_torque[1] += torque_i[1] * area_ratio;
i_forces.delta_torque[2] += torque_i[2] * area_ratio;
#else
i_forces.delta_torque[0] += -sidata.cri * tor1 * area_ratio;
i_forces.delta_torque[1] += -sidata.cri * tor2 * area_ratio;
i_forces.delta_torque[2] += -sidata.cri * tor3 * area_ratio;
#endif
} else {
i_forces.delta_F[0] += Ft1;
i_forces.delta_F[1] += Ft2;
i_forces.delta_F[2] += Ft3;
j_forces.delta_F[0] -= Ft1;
j_forces.delta_F[1] -= Ft2;
j_forces.delta_F[2] -= Ft3;
#ifdef NONSPHERICAL_ACTIVE_FLAG
double torque_j[3];
if(sidata.is_non_spherical) {
double xcj[3];
vectorSubtract3D(sidata.contact_point, atom->x[sidata.j], xcj);
double Ft_j[3] = { -Ft1, -Ft2, -Ft3 };
vectorCross3D(xcj, Ft_j, torque_j);
} else {
torque_j[0] = -sidata.crj * tor1;
torque_j[1] = -sidata.crj * tor2;
torque_j[2] = -sidata.crj * tor3;
}
i_forces.delta_torque[0] += torque_i[0];
i_forces.delta_torque[1] += torque_i[1];
i_forces.delta_torque[2] += torque_i[2];
j_forces.delta_torque[0] += torque_j[0];
j_forces.delta_torque[1] += torque_j[1];
j_forces.delta_torque[2] += torque_j[2];
#else
i_forces.delta_torque[0] += -sidata.cri * tor1;
i_forces.delta_torque[1] += -sidata.cri * tor2;
i_forces.delta_torque[2] += -sidata.cri * tor3;
j_forces.delta_torque[0] += -sidata.crj * tor1;
j_forces.delta_torque[1] += -sidata.crj * tor2;
j_forces.delta_torque[2] += -sidata.crj * tor3;
#endif
}
}
}
inline void beginPass(SurfacesIntersectData&, ForceData&, ForceData&){}
inline void endPass(SurfacesIntersectData&, ForceData&, ForceData&){}
inline void surfacesClose(SurfacesCloseData &scdata, ForceData&, ForceData&)
{
if(scdata.contact_flags) *scdata.contact_flags &= ~CONTACT_TANGENTIAL_MODEL;
}
private:
double ** coeffFrict;
bool disable_when_bonded_;
int bond_history_offset_;
int dissipation_history_offset_;
bool dissipatedflag_;
FixPropertyAtom *fix_dissipated_;
};
}
}
#endif // TANGENTIAL_MODEL_NO_HISTORY_H_
#endif
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