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fix_append_atoms.cpp
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Wed, Jul 16, 07:08

fix_append_atoms.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 "math.h"
#include "string.h"
#include "stdlib.h"
#include "fix_append_atoms.h"
#include "atom.h"
#include "atom_vec.h"
#include "comm.h"
#include "modify.h"
#include "domain.h"
#include "lattice.h"
#include "update.h"
#include "random_mars.h"
#include "error.h"
#include "force.h"
using namespace LAMMPS_NS;
using namespace FixConst;
#define BIG 1.0e30
#define EPSILON 1.0e-6
/* ---------------------------------------------------------------------- */
FixAppendAtoms::FixAppendAtoms(LAMMPS *lmp, int narg, char **arg) :
Fix(lmp, narg, arg)
{
force_reneighbor = 1;
next_reneighbor = -1;
box_change = 1;
time_depend = 1;
if (narg < 4) error->all(FLERR,"Illegal fix append/atoms command");
// default settings
scaleflag = 1;
spatflag=0;
xloflag = xhiflag = yloflag = yhiflag = zloflag = zhiflag = 0;
tempflag = 0;
ranflag = 0;
ranx = 0.0;
rany = 0.0;
ranz = 0.0;
randomx = NULL;
randomt = NULL;
int iarg = 0;
iarg = 3;
while (iarg < narg) {
if (strcmp(arg[iarg],"xlo") == 0) {
error->all(FLERR,"Only zhi currently implemented for fix append/atoms");
xloflag = 1;
iarg++;
if (domain->boundary[0][0] != 3)
error->all(FLERR,"Append boundary must be shrink/minimum");
} else if (strcmp(arg[iarg],"xhi") == 0) {
error->all(FLERR,"Only zhi currently implemented for fix append/atoms");
xhiflag = 1;
iarg++;
if (domain->boundary[0][1] != 3)
error->all(FLERR,"Append boundary must be shrink/minimum");
} else if (strcmp(arg[iarg],"ylo") == 0) {
error->all(FLERR,"Only zhi currently implemented for fix append/atoms");
yloflag = 1;
iarg++;
if (domain->boundary[1][0] != 3)
error->all(FLERR,"Append boundary must be shrink/minimum");
} else if (strcmp(arg[iarg],"yhi") == 0) {
error->all(FLERR,"Only zhi currently implemented for fix append/atoms");
yhiflag = 1;
iarg++;
if (domain->boundary[1][1] != 3)
error->all(FLERR,"Append boundary must be shrink/minimum");
} else if (strcmp(arg[iarg],"zlo") == 0) {
error->all(FLERR,"Only zhi currently implemented for fix append/atoms");
zloflag = 1;
iarg++;
if (domain->boundary[2][0] != 3)
error->all(FLERR,"Append boundary must be shrink/minimum");
} else if (strcmp(arg[iarg],"zhi") == 0) {
zhiflag = 1;
iarg++;
if (domain->boundary[2][1] != 3)
error->all(FLERR,"Append boundary must be shrink/minimum");
} else if (strcmp(arg[iarg],"freq") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal fix append/atoms command");
freq = atoi(arg[iarg+1]);
iarg += 2;
} else if (strcmp(arg[iarg],"spatial") == 0) {
if (iarg+3 > narg) error->all(FLERR,"Illegal fix append/atoms command");
if (strcmp(arg[iarg+1],"f_") == 0)
error->all(FLERR,
"Bad fix ID in fix append/atoms command");
spatflag = 1;
int n = strlen(arg[iarg+1]);
spatlead = atof(arg[iarg+2]);
char *suffix = new char[n];
strcpy(suffix,&arg[iarg+1][2]);
n = strlen(suffix) + 1;
spatialid = new char[n];
strcpy(spatialid,suffix);
delete [] suffix;
iarg += 3;
} else if (strcmp(arg[iarg],"size") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal fix append/atoms command");
size = atof(arg[iarg+1]);
iarg += 2;
} else if (strcmp(arg[iarg],"units") == 0) {
if (iarg+2 > narg) error->all(FLERR,"Illegal fix append/atoms command");
if (strcmp(arg[iarg+1],"box") == 0) scaleflag = 0;
else if (strcmp(arg[iarg+1],"lattice") == 0) scaleflag = 1;
else error->all(FLERR,"Illegal fix append/atoms command");
iarg += 2;
} else if (strcmp(arg[iarg],"random") == 0) {
if (iarg+5 > narg) error->all(FLERR,"Illegal fix append/atoms command");
ranflag = 1;
ranx = atof(arg[iarg+1]);
rany = atof(arg[iarg+2]);
ranz = atof(arg[iarg+3]);
xseed = atoi(arg[iarg+4]);
if (xseed <= 0) error->all(FLERR,"Illegal fix append/atoms command");
randomx = new RanMars(lmp,xseed + comm->me);
iarg += 5;
} else if (strcmp(arg[iarg],"temp") == 0) {
if (iarg+5 > narg) error->all(FLERR,"Illegal fix append/atoms command");
tempflag = 1;
t_target = atof(arg[iarg+1]);
t_period = atof(arg[iarg+2]);
tseed = atoi(arg[iarg+3]);
t_extent = atof(arg[iarg+4]);
if (t_target <= 0) error->all(FLERR,"Illegal fix append/atoms command");
if (t_period <= 0) error->all(FLERR,"Illegal fix append/atoms command");
if (t_extent <= 0) error->all(FLERR,"Illegal fix append/atoms command");
if (tseed <= 0) error->all(FLERR,"Illegal fix append/atoms command");
randomt = new RanMars(lmp,tseed + comm->me);
gfactor1 = new double[atom->ntypes+1];
gfactor2 = new double[atom->ntypes+1];
iarg += 5;
} else error->all(FLERR,"Illegal fix append/atoms command");
}
if ((xloflag || xhiflag) && domain->xperiodic)
error->all(FLERR,"Cannot use append/atoms in periodic dimension");
if ((yloflag || yhiflag) && domain->yperiodic)
error->all(FLERR,"Cannot use append/atoms in periodic dimension");
if ((zloflag || zhiflag) && domain->zperiodic)
error->all(FLERR,"Cannot use append/atoms in periodic dimension");
if (domain->triclinic == 1)
error->all(FLERR,"Cannot append atoms to a triclinic box");
// setup scaling
if (scaleflag && domain->lattice == NULL)
error->all(FLERR,"Use of fix append/atoms with undefined lattice");
double xscale,yscale,zscale;
if (scaleflag) {
xscale = domain->lattice->xlattice;
yscale = domain->lattice->ylattice;
zscale = domain->lattice->zlattice;
}
else xscale = yscale = zscale = 1.0;
if (xloflag || xhiflag) size *= xscale;
if (yloflag || yhiflag) size *= yscale;
if (zloflag || zhiflag) size *= zscale;
if (ranflag) {
ranx *= xscale;
rany *= yscale;
ranz *= zscale;
}
}
/* ---------------------------------------------------------------------- */
FixAppendAtoms::~FixAppendAtoms()
{
if (ranflag) delete randomx;
if (tempflag) {
delete randomt;
delete [] gfactor1;
delete [] gfactor2;
}
}
/* ---------------------------------------------------------------------- */
int FixAppendAtoms::setmask()
{
int mask = 0;
mask |= PRE_EXCHANGE;
mask |= INITIAL_INTEGRATE;
mask |= POST_FORCE;
return mask;
}
/* ---------------------------------------------------------------------- */
void FixAppendAtoms::initial_integrate(int vflag)
{
if (update->ntimestep % freq == 0) {
next_reneighbor = update->ntimestep;
}
}
/* ---------------------------------------------------------------------- */
void FixAppendAtoms::setup(int vflag)
{
/*** CALL TO CREATE GROUP? SEE POST_FORCE ***/
post_force(vflag);
}
/* ---------------------------------------------------------------------- */
int FixAppendAtoms::get_spatial()
{
if (update->ntimestep % freq == 0) {
int ifix = modify->find_fix(spatialid);
if (ifix < 0)
error->all(FLERR,"Fix ID for fix ave/spatial does not exist");
Fix *fix = modify->fix[ifix];
int failed = 0;
int count = 0;
while (failed < 2) {
double tmp = fix->compute_vector(2*count);
if (tmp == 0.0) failed++;
else failed = 0;
count++;
}
double *pos = new double[count-2];
double *val = new double[count-2];
for (int loop=0; loop < count-2; loop++) {
pos[loop] = fix->compute_vector(2*loop);
val[loop] = fix->compute_vector(2*loop+1);
}
// always ignore the first and last
double binsize = 2.0;
double min_energy=0.0;
double max_energy=0.0;
int header = static_cast<int> (size / binsize);
advance = 0;
for (int loop=1; loop <= header; loop++) {
max_energy += val[loop];
}
for (int loop=count-2-2*header; loop <=count-3-header; loop++) {
min_energy += val[loop];
}
max_energy /= header;
min_energy /= header;
double shockfront_min = 0.0;
double shockfront_max = 0.0;
double shockfront_loc = 0.0;
int front_found1 = 0;
for (int loop=count-3-header; loop > header; loop--) {
if (front_found1 == 1) continue;
if (val[loop] > min_energy + 0.1*(max_energy - min_energy)) {
shockfront_max = pos[loop];
front_found1=1;
}
}
int front_found2 = 0;
for (int loop=header+1; loop <=count-3-header; loop++) {
if (val[loop] > min_energy + 0.6*(max_energy - min_energy)) {
shockfront_min = pos[loop];
front_found2=1;
}
}
if (front_found1 + front_found2 == 0) shockfront_loc = 0.0;
else if (front_found1 + front_found2 == 1)
shockfront_loc = shockfront_max + shockfront_min;
else if (front_found1 == 1 && front_found2 == 1 &&
shockfront_max-shockfront_min > spatlead/2.0)
shockfront_loc = shockfront_max;
else shockfront_loc = (shockfront_max + shockfront_min) / 2.0;
if (comm->me == 0)
printf("SHOCK: %g %g %g %g %g\n", shockfront_loc, shockfront_min,
shockfront_max, domain->boxlo[2], domain->boxhi[2]);
if (domain->boxhi[2] - shockfront_loc < spatlead) advance = 1;
delete [] pos,val;
}
advance_sum = 0;
MPI_Allreduce(&advance,&advance_sum,1,MPI_INT,MPI_SUM,world);
if (advance_sum > 0) return 1;
else return 0;
}
/* ---------------------------------------------------------------------- */
void FixAppendAtoms::post_force(int vflag)
{
double **f = atom->f;
double **v = atom->v;
double **x = atom->x;
int *type = atom->type;
int nlocal = atom->nlocal;
double gamma1,gamma2;
double tsqrt = sqrt(t_target);
if (atom->mass) {
if (tempflag) {
for (int i = 1; i <= atom->ntypes; i++) {
gfactor1[i] = -atom->mass[i] / t_period / force->ftm2v;
gfactor2[i] = sqrt(atom->mass[i]) *
sqrt(24.0*force->boltz/t_period/update->dt/force->mvv2e) /
force->ftm2v;
}
}
for (int i = 0; i < nlocal; i++) {
// SET TEMP AHEAD OF SHOCK
if (tempflag && x[i][2] >= domain->boxhi[2] - t_extent ) {
gamma1 = gfactor1[type[i]];
gamma2 = gfactor2[type[i]] * tsqrt;
f[i][0] += gamma1*v[i][0] + gamma2*(randomt->uniform()-0.5);
f[i][1] += gamma1*v[i][1] + gamma2*(randomt->uniform()-0.5);
f[i][2] += gamma1*v[i][2] + gamma2*(randomt->uniform()-0.5);
}
// FREEZE ATOMS AT BOUNDARY
if (x[i][2] >= domain->boxhi[2] - size) {
f[i][0] = 0.0;
f[i][1] = 0.0;
f[i][2] = 0.0;
v[i][0] = 0.0;
v[i][1] = 0.0;
v[i][2] = 0.0;
}
}
} else {
double *rmass = atom->rmass;
double boltz = force->boltz;
double dt = update->dt;
double mvv2e = force->mvv2e;
double ftm2v = force->ftm2v;
for (int i = 0; i < nlocal; i++) {
// set temp ahead of shock
if (tempflag && x[i][2] >= domain->boxhi[2] - t_extent ) {
gamma1 = -rmass[i] / t_period / ftm2v;
gamma2 = sqrt(rmass[i]) * sqrt(24.0*boltz/t_period/dt/mvv2e) / ftm2v;
gamma2 *= tsqrt;
f[i][0] += gamma1*v[i][0] + gamma2*(randomt->uniform()-0.5);
f[i][1] += gamma1*v[i][1] + gamma2*(randomt->uniform()-0.5);
f[i][2] += gamma1*v[i][2] + gamma2*(randomt->uniform()-0.5);
}
// freeze atoms at boundary
if (x[i][2] >= domain->boxhi[2] - size) {
f[i][0] = 0.0;
f[i][1] = 0.0;
f[i][2] = 0.0;
v[i][0] = 0.0;
v[i][1] = 0.0;
v[i][2] = 0.0;
}
}
}
}
/* ---------------------------------------------------------------------- */
void FixAppendAtoms::pre_exchange()
{
int ntimestep = update->ntimestep;
int addnode = 0;
if (ntimestep % freq == 0) {
if (spatflag==1) if (get_spatial()==0) return;
if (comm->myloc[2] == comm->procgrid[2]-1) {
if (domain->lattice) {
nbasis = domain->lattice->nbasis;
basistype = new int[nbasis];
for (int i = 0; i < nbasis; i++) basistype[i] = 1;
} else error->all(FLERR,"Must define lattice to append/atoms");
double bboxlo[3],bboxhi[3];
bboxlo[0] = domain->sublo[0]; bboxhi[0] = domain->subhi[0];
bboxlo[1] = domain->sublo[1]; bboxhi[1] = domain->subhi[1];
bboxlo[2] = domain->subhi[2]; bboxhi[2] = domain->subhi[2]+size;
double xmin,ymin,zmin,xmax,ymax,zmax;
xmin = ymin = zmin = BIG;
xmax = ymax = zmax = -BIG;
domain->lattice->bbox(1,bboxlo[0],bboxlo[1],bboxlo[2],
xmin,ymin,zmin,xmax,ymax,zmax);
domain->lattice->bbox(1,bboxhi[0],bboxlo[1],bboxlo[2],
xmin,ymin,zmin,xmax,ymax,zmax);
domain->lattice->bbox(1,bboxlo[0],bboxhi[1],bboxlo[2],
xmin,ymin,zmin,xmax,ymax,zmax);
domain->lattice->bbox(1,bboxhi[0],bboxhi[1],bboxlo[2],
xmin,ymin,zmin,xmax,ymax,zmax);
domain->lattice->bbox(1,bboxlo[0],bboxlo[1],bboxhi[2],
xmin,ymin,zmin,xmax,ymax,zmax);
domain->lattice->bbox(1,bboxhi[0],bboxlo[1],bboxhi[2],
xmin,ymin,zmin,xmax,ymax,zmax);
domain->lattice->bbox(1,bboxlo[0],bboxhi[1],bboxhi[2],
xmin,ymin,zmin,xmax,ymax,zmax);
domain->lattice->bbox(1,bboxhi[0],bboxhi[1],bboxhi[2],
xmin,ymin,zmin,xmax,ymax,zmax);
int ilo,ihi,jlo,jhi,klo,khi;
ilo = static_cast<int> (xmin);
jlo = static_cast<int> (ymin);
klo = static_cast<int> (zmin);
ihi = static_cast<int> (xmax);
jhi = static_cast<int> (ymax);
khi = static_cast<int> (zmax);
if (xmin < 0.0) ilo--;
if (ymin < 0.0) jlo--;
if (zmin < 0.0) klo--;
double **basis = domain->lattice->basis;
double x[3];
double *sublo = domain->sublo;
double *subhi = domain->subhi;
double *mass = atom->mass;
int i,j,k,m;
for (k = klo; k <= khi; k++) {
for (j = jlo; j <= jhi; j++) {
for (i = ilo; i <= ihi; i++) {
for (m = 0; m < nbasis; m++) {
x[0] = i + basis[m][0];
x[1] = j + basis[m][1];
x[2] = k + basis[m][2];
int flag = 0;
// convert from lattice coords to box coords
domain->lattice->lattice2box(x[0],x[1],x[2]);
if (x[0] >= sublo[0] && x[0] < subhi[0] &&
x[1] >= sublo[1] && x[1] < subhi[1] &&
x[2] >= subhi[2] && x[2] < subhi[2]+size) flag = 1;
else if (domain->dimension == 2 && x[1] >= domain->boxhi[1] &&
comm->myloc[1] == comm->procgrid[1]-1 &&
x[0] >= sublo[0] && x[0] < subhi[0]) flag = 1;
if (flag) {
if (ranflag) {
x[0] += ranx * 2.0*(randomx->uniform()-0.5);
x[1] += rany * 2.0*(randomx->uniform()-0.5);
x[2] += ranz * 2.0*(randomx->uniform()-0.5);
}
addnode++;
atom->avec->create_atom(basistype[m],x);
}
}
}
}
}
}
int addtotal = 0;
MPI_Barrier(world);
MPI_Allreduce(&addnode,&addtotal,1,MPI_INT,MPI_SUM,world);
if (addtotal) {
domain->reset_box();
if (atom->tag_enable) {
atom->tag_extend();
atom->natoms += addtotal;
if (atom->map_style) {
atom->nghost = 0;
atom->map_init();
atom->map_set();
}
}
}
}
}

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