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lammps/src/temp_region.cpp
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temp_region.cpp
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
www.cs.sandia.gov/~sjplimp/lammps.html
Steve Plimpton, sjplimp@sandia.gov, Sandia National Laboratories
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.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#include "mpi.h"
#include "string.h"
#include "temp_region.h"
#include "atom.h"
#include "force.h"
#include "domain.h"
#include "region.h"
#include "error.h"
/* ---------------------------------------------------------------------- */
TempRegion::TempRegion(int narg, char **arg) : Temperature(narg, arg)
{
for (iregion = 0; iregion < domain->nregion; iregion++)
if (strcmp(arg[3],domain->regions[iregion]->id) == 0) break;
if (iregion == domain->nregion)
error->all("Temperature region ID does not exist");
}
/* ---------------------------------------------------------------------- */
void TempRegion::init()
{
dof = 0;
}
/* ---------------------------------------------------------------------- */
double TempRegion::compute()
{
double **x = atom->x;
double **v = atom->v;
double *mass = atom->mass;
int *type = atom->type;
int *mask = atom->mask;
int nlocal = atom->nlocal;
int count = 0;
double t = 0.0;
for (int i = 0; i < nlocal; i++)
if (mask[i] & groupbit &&
domain->regions[iregion]->match(x[i][0],x[i][1],x[i][2])) {
count++;
t += (v[i][0]*v[i][0] + v[i][1]*v[i][1] + v[i][2]*v[i][2]) *
mass[type[i]];
}
double tarray[2],tarray_all[2];
tarray[0] = count;
tarray[1] = t;
MPI_Allreduce(tarray,tarray_all,2,MPI_DOUBLE,MPI_SUM,world);
dof = force->dimension * tarray_all[0] - extra_dof;
if (dof > 0) t_total = force->mvv2e * tarray_all[1] / (dof * force->boltz);
else t_total = 0.0;
return t_total;
}
/* ---------------------------------------------------------------------- */
void TempRegion::tensor()
{
int i;
double **x = atom->x;
double **v = atom->v;
double *mass = atom->mass;
int *type = atom->type;
int *mask = atom->mask;
int nlocal = atom->nlocal;
double rmass,t[6];
for (i = 0; i < 6; i++) t[i] = 0.0;
for (i = 0; i < nlocal; i++)
if (mask[i] & groupbit &&
domain->regions[iregion]->match(x[i][0],x[i][1],x[i][2])) {
rmass = mass[type[i]];
t[0] += rmass * v[i][0]*v[i][0];
t[1] += rmass * v[i][1]*v[i][1];
t[2] += rmass * v[i][2]*v[i][2];
t[3] += rmass * v[i][0]*v[i][1];
t[4] += rmass * v[i][0]*v[i][2];
t[5] += rmass * v[i][1]*v[i][2];
}
MPI_Allreduce(&t,&ke_tensor,6,MPI_DOUBLE,MPI_SUM,world);
for (i = 0; i < 6; i++) ke_tensor[i] *= force->mvv2e;
}
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