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/* ----------------------------------------------------------------------
This is the
██╗ ██╗ ██████╗ ██████╗ ██████╗ ██╗ ██╗████████╗███████╗
██║ ██║██╔════╝ ██╔════╝ ██╔════╝ ██║ ██║╚══██╔══╝██╔════╝
██║ ██║██║ ███╗██║ ███╗██║ ███╗███████║ ██║ ███████╗
██║ ██║██║ ██║██║ ██║██║ ██║██╔══██║ ██║ ╚════██║
███████╗██║╚██████╔╝╚██████╔╝╚██████╔╝██║ ██║ ██║ ███████║
╚══════╝╚═╝ ╚═════╝ ╚═════╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚══════╝®
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:
This file is from LAMMPS
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
------------------------------------------------------------------------- */
#include <cmath>
#include <stdlib.h>
#include <string.h>
#include "region_sphere.h"
#include "update.h"
#include "input.h"
#include "variable.h"
#include "error.h"
#include "force.h"
using namespace LAMMPS_NS;
enum{CONSTANT,VARIABLE};
/* ---------------------------------------------------------------------- */
RegSphere::RegSphere(LAMMPS *lmp, int narg, char **arg) :
Region(lmp, narg, arg)
{
options(narg-6,&arg[6]);
xc = xscale*force->numeric(FLERR,arg[2]);
yc = yscale*force->numeric(FLERR,arg[3]);
zc = zscale*force->numeric(FLERR,arg[4]);
rstr = NULL;
if (strstr(arg[5],"v_") == arg[5]) {
int n = strlen(&arg[5][2]) + 1;
rstr = new char[n];
strcpy(rstr,&arg[5][2]);
radius = 0.0;
rstyle = VARIABLE;
varshape = 1;
variable_check();
shape_update();
} else {
radius = xscale*force->numeric(FLERR,arg[5]);
rstyle = CONSTANT;
}
// error check
if (radius < 0.0) error->all(FLERR,"Illegal region sphere command");
// extent of sphere
// for variable radius, uses initial radius
if (interior) {
bboxflag = 1;
extent_xlo = xc - radius;
extent_xhi = xc + radius;
extent_ylo = yc - radius;
extent_yhi = yc + radius;
extent_zlo = zc - radius;
extent_zhi = zc + radius;
} else bboxflag = 0;
cmax = 1;
contact = new Contact[cmax];
}
/* ---------------------------------------------------------------------- */
RegSphere::~RegSphere()
{
delete [] rstr;
delete [] contact;
}
/* ---------------------------------------------------------------------- */
void RegSphere::init()
{
Region::init();
if (rstr) variable_check();
}
/* ----------------------------------------------------------------------
inside = 1 if x,y,z is inside or on surface
inside = 0 if x,y,z is outside and not on surface
------------------------------------------------------------------------- */
int RegSphere::inside(double x, double y, double z)
{
double delx = x - xc;
double dely = y - yc;
double delz = z - zc;
double r = sqrt(delx*delx + dely*dely + delz*delz);
if (r <= radius) return 1;
return 0;
}
/* ----------------------------------------------------------------------
one contact if 0 <= x < cutoff from inner surface of sphere
no contact if outside (possible if called from union/intersect)
delxyz = vector from nearest point on sphere to x
special case: no contact if x is at center of sphere
------------------------------------------------------------------------- */
int RegSphere::surface_interior(double *x, double cutoff)
{
double delx = x[0] - xc;
double dely = x[1] - yc;
double delz = x[2] - zc;
double r = sqrt(delx*delx + dely*dely + delz*delz);
if (r > radius || r == 0.0) return 0;
double delta = radius - r;
if (delta < cutoff) {
contact[0].r = delta;
contact[0].delx = delx*(1.0-radius/r);
contact[0].dely = dely*(1.0-radius/r);
contact[0].delz = delz*(1.0-radius/r);
return 1;
}
return 0;
}
/* ----------------------------------------------------------------------
one contact if 0 <= x < cutoff from outer surface of sphere
no contact if inside (possible if called from union/intersect)
delxyz = vector from nearest point on sphere to x
------------------------------------------------------------------------- */
int RegSphere::surface_exterior(double *x, double cutoff)
{
double delx = x[0] - xc;
double dely = x[1] - yc;
double delz = x[2] - zc;
double r = sqrt(delx*delx + dely*dely + delz*delz);
if (r < radius) return 0;
double delta = r - radius;
if (delta < cutoff) {
contact[0].r = delta;
contact[0].delx = delx*(1.0-radius/r);
contact[0].dely = dely*(1.0-radius/r);
contact[0].delz = delz*(1.0-radius/r);
return 1;
}
return 0;
}
/* ----------------------------------------------------------------------
change region shape via variable evaluation
------------------------------------------------------------------------- */
void RegSphere::shape_update()
{
radius = xscale * input->variable->compute_equal(rvar);
if (radius < 0.0)
error->one(FLERR,"Variable evaluation in region gave bad value");
}
/* ----------------------------------------------------------------------
error check on existence of variable
------------------------------------------------------------------------- */
void RegSphere::variable_check()
{
rvar = input->variable->find(rstr);
if (rvar < 0)
error->all(FLERR,"Variable name for region sphere does not exist");
if (!input->variable->equalstyle(rvar))
error->all(FLERR,"Variable for region sphere is invalid style");
}
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