/usr/include/liggghts/tangential_model_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_HISTORY,history,2)
#else
#ifndef TANGENTIAL_MODEL_HISTORY_H_
#define TANGENTIAL_MODEL_HISTORY_H_
#include "contact_models.h"
#include "tangential_model_base.h"
#include <math.h>
#include "update.h"
#include "global_properties.h"
#include "atom.h"
namespace LIGGGHTS {
namespace ContactModels
{
template<>
class TangentialModel<TANGENTIAL_HISTORY> : public TangentialModelBase
{
double ** coeffFrict;
int history_offset;
public:
TangentialModel(LAMMPS * lmp, IContactHistorySetup * hsetup,class ContactModelBase *c) :
TangentialModelBase(lmp, hsetup, c),
coeffFrict(NULL),
heating(false),
heating_track(false),
cmb(c)
{
history_offset = hsetup->add_history_value("shearx", "1");
hsetup->add_history_value("sheary", "1");
hsetup->add_history_value("shearz", "1");
}
inline void postSettings(IContactHistorySetup * hsetup, ContactModelBase *cmb)
{}
inline void registerSettings(Settings& settings)
{
settings.registerOnOff("heating_tangential_history",heating,false);
settings.registerOnOff("heating_tracking",heating_track,false);
//TODO error->one(FLERR,"TODO here also check if right surface model used");
}
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)
{
// normal forces = Hookian contact + normal velocity damping
const double enx = sidata.en[0];
const double eny = sidata.en[1];
const double enz = sidata.en[2];
// shear history effects
if(sidata.contact_flags) *sidata.contact_flags |= CONTACT_TANGENTIAL_MODEL;
double * const shear = &sidata.contact_history[history_offset];
const bool update_history = sidata.computeflag && sidata.shearupdate;
if (update_history) {
const double dt = update->dt;
shear[0] += sidata.vtr1 * dt;
shear[1] += sidata.vtr2 * dt;
shear[2] += sidata.vtr3 * dt;
// rotate shear displacements
double rsht = shear[0]*enx + shear[1]*eny + shear[2]*enz;
shear[0] -= rsht * enx;
shear[1] -= rsht * eny;
shear[2] -= rsht * enz;
}
const double shrmag = sqrt(shear[0]*shear[0] + shear[1]*shear[1] + shear[2]*shear[2]);
const double kt = sidata.kt;
const double xmu = coeffFrict[sidata.itype][sidata.jtype];
// tangential forces = shear + tangential velocity damping
double Ft1 = -(kt * shear[0]);
double Ft2 = -(kt * shear[1]);
double Ft3 = -(kt * shear[2]);
// rescale frictional displacements and forces if needed
const double Ft_shear = kt * shrmag; // sqrt(Ft1 * Ft1 + Ft2 * Ft2 + Ft3 * Ft3);
const double Ft_friction = xmu * fabs(sidata.Fn);
// energy loss from sliding or damping
if (Ft_shear > Ft_friction) {
if (shrmag != 0.0) {
const double ratio = Ft_friction / Ft_shear;
if(heating)
{
sidata.P_diss += (vectorMag3DSquared(shear)*kt - ratio*ratio*vectorMag3DSquared(shear)*kt) / (update->dt);
if(heating_track && sidata.is_wall) cmb->tally_pw((vectorMag3DSquared(shear)*kt - ratio*ratio*vectorMag3DSquared(shear)*kt) / (update->dt),sidata.i,sidata.jtype,2);
if(heating_track && !sidata.is_wall) cmb->tally_pp((vectorMag3DSquared(shear)*kt - ratio*ratio*vectorMag3DSquared(shear)*kt) / (update->dt),sidata.i,sidata.j,2);
}
Ft1 *= ratio;
Ft2 *= ratio;
Ft3 *= ratio;
if (update_history)
{
shear[0] = -Ft1/kt;
shear[1] = -Ft2/kt;
shear[2] = -Ft3/kt;
}
}
else Ft1 = Ft2 = Ft3 = 0.0;
}
else
{
const double gammat = sidata.gammat;
Ft1 -= (gammat*sidata.vtr1);
Ft2 -= (gammat*sidata.vtr2);
Ft3 -= (gammat*sidata.vtr3);
if(heating)
{
sidata.P_diss += gammat*(sidata.vtr1*sidata.vtr1+sidata.vtr2*sidata.vtr2+sidata.vtr3*sidata.vtr3);
if(heating_track && sidata.is_wall) cmb->tally_pw(gammat*(sidata.vtr1*sidata.vtr1+sidata.vtr2*sidata.vtr2+sidata.vtr3*sidata.vtr3),sidata.i,sidata.jtype,1);
if(heating_track && !sidata.is_wall) cmb->tally_pp(gammat*(sidata.vtr1*sidata.vtr1+sidata.vtr2*sidata.vtr2+sidata.vtr3*sidata.vtr3),sidata.i,sidata.j,1);
}
}
// 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(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 surfacesClose(SurfacesCloseData & scdata, ForceData&, ForceData&)
{
// unset non-touching neighbors
// TODO even if shearupdate == false?
if(scdata.contact_flags) *scdata.contact_flags &= ~CONTACT_TANGENTIAL_MODEL;
if(!scdata.contact_history)
return; //DO NOT access contact_history if not available
double * const shear = &scdata.contact_history[history_offset];
shear[0] = 0.0;
shear[1] = 0.0;
shear[2] = 0.0;
}
inline void beginPass(SurfacesIntersectData&, ForceData&, ForceData&){}
inline void endPass(SurfacesIntersectData&, ForceData&, ForceData&){}
protected:
bool heating;
bool heating_track;
class ContactModelBase *cmb;
};
}
}
#endif // TANGENTIAL_MODEL_HISTORY_H_
#endif
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