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compute_temp_region.cpp
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Tue, May 28, 06:04
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rLAMMPS lammps
compute_temp_region.cpp
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/* ----------------------------------------------------------------------
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.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#include "mpi.h"
#include "string.h"
#include "compute_temp_region.h"
#include "atom.h"
#include "force.h"
#include "domain.h"
#include "region.h"
#include "error.h"
using namespace LAMMPS_NS;
#define INVOKED_SCALAR 1
#define INVOKED_VECTOR 2
/* ---------------------------------------------------------------------- */
ComputeTempRegion::ComputeTempRegion(LAMMPS *lmp, int narg, char **arg) :
Compute(lmp, narg, arg)
{
if (narg != 4) error->all("Illegal compute temp/region command");
iregion = domain->find_region(arg[3]);
if (iregion == -1) error->all("Temperature region ID does not exist");
scalar_flag = vector_flag = 1;
size_vector = 6;
extscalar = 0;
extvector = 1;
tempflag = 1;
vector = new double[6];
}
/* ---------------------------------------------------------------------- */
ComputeTempRegion::~ComputeTempRegion()
{
delete [] vector;
}
/* ---------------------------------------------------------------------- */
void ComputeTempRegion::init()
{
dof = 0;
}
/* ---------------------------------------------------------------------- */
double ComputeTempRegion::compute_scalar()
{
invoked |= INVOKED_SCALAR;
double **x = atom->x;
double **v = atom->v;
double *mass = atom->mass;
double *rmass = atom->rmass;
int *type = atom->type;
int *mask = atom->mask;
int nlocal = atom->nlocal;
int count = 0;
double t = 0.0;
if (mass) {
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]];
}
} else {
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]) * rmass[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 = domain->dimension * tarray_all[0] - extra_dof;
if (dof > 0) scalar = force->mvv2e * tarray_all[1] / (dof * force->boltz);
else scalar = 0.0;
return scalar;
}
/* ---------------------------------------------------------------------- */
void ComputeTempRegion::compute_vector()
{
int i;
invoked |= INVOKED_VECTOR;
double **x = atom->x;
double **v = atom->v;
double *mass = atom->mass;
double *rmass = atom->rmass;
int *type = atom->type;
int *mask = atom->mask;
int nlocal = atom->nlocal;
double massone,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])) {
if (mass) massone = mass[type[i]];
else massone = rmass[i];
t[0] += massone * v[i][0]*v[i][0];
t[1] += massone * v[i][1]*v[i][1];
t[2] += massone * v[i][2]*v[i][2];
t[3] += massone * v[i][0]*v[i][1];
t[4] += massone * v[i][0]*v[i][2];
t[5] += massone * v[i][1]*v[i][2];
}
MPI_Allreduce(t,vector,6,MPI_DOUBLE,MPI_SUM,world);
for (i = 0; i < 6; i++) vector[i] *= force->mvv2e;
}
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