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nstencil_half_bin_2d_newton_ssa.cpp
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Thu, May 30, 09:52

nstencil_half_bin_2d_newton_ssa.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.
------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
Contributing authors:
James Larentzos and Timothy I. Mattox (Engility Corporation)
------------------------------------------------------------------------- */
#include "nstencil_half_bin_2d_newton_ssa.h"
#include "neighbor.h"
#include "neigh_list.h"
using namespace LAMMPS_NS;
/* ---------------------------------------------------------------------- */
NStencilHalfBin2dNewtonSSA::NStencilHalfBin2dNewtonSSA(LAMMPS *lmp) :
NStencilSSA(lmp) {}
/* ----------------------------------------------------------------------
create stencil based on bin geometry and cutoff
stencil = bins whose closest corner to central bin is within cutoff
sx,sy,sz = bin bounds = furthest the stencil could possibly extend
3d creates xyz stencil, 2d creates xy stencil
for half list with newton on:
stencil is bins to the "upper right" of central bin
stencil does not include self
additionally, includes the bins beyond nstencil that are needed
to locate all the Active Interaction Region (AIR) ghosts for SSA
------------------------------------------------------------------------- */
void NStencilHalfBin2dNewtonSSA::create()
{
int i,j,pos = 0;
nstencil_ssa[0] = 0; // redundant info, but saves a conditional
// Include the centroid at the start.
// It will be handled as part of Subphase 0.
stencilxyz[pos][0] = 0;
stencilxyz[pos][1] = 0;
stencilxyz[pos][2] = 0;
stencil[pos++] = 0;
// Subphase 0: upper right front bins (red)
for (j = 0; j <= sy; j++)
for (i = 0; i <= sx; i++)
if (j > 0 || i > 0) // skip the centroid
if (bin_distance(i,j,0) < cutneighmaxsq) {
stencilxyz[pos][0] = i;
stencilxyz[pos][1] = j;
stencilxyz[pos][2] = 0;
stencil[pos++] = j*mbinx + i;
}
nstencil_ssa[1] = pos;
// Subphase 1: upper left front bins (light blue)
for (j = 1; j <= sy; j++)
for (i = -sx; i < 0; i++)
if (bin_distance(i,j,0) < cutneighmaxsq) {
stencilxyz[pos][0] = i;
stencilxyz[pos][1] = j;
stencilxyz[pos][2] = 0;
stencil[pos++] = j*mbinx + i;
}
nstencil_ssa[2] = pos;
// Subphase 2: lower right front bins (yellow)
nstencil_ssa[3] = pos;
// Subphase 3: lower left front bins (blue)
nstencil_ssa[4] = pos; // record end of half stencil
// Now include additional bins for AIR ghosts, and impure-to-pure locals
// Subphase 4: upper right back bins (pink)
// nstencil_ssa[5] = pos;
// Subphase 5: upper left back bins (light green)
// nstencil_ssa[6] = pos;
// Subphase 6: lower right back bins (white)
for (j = -sy; j < 0; j++)
for (i = 0; i <= sx; i++)
if (bin_distance(i,j,0) < cutneighmaxsq) {
stencilxyz[pos][0] = i;
stencilxyz[pos][1] = j;
stencilxyz[pos][2] = 0;
stencil[pos++] = j*mbinx + i;
}
// nstencil_ssa[7] = pos;
// Subphase 7: lower left back bins (purple)
for (j = -sy; j <= 0; j++)
for (i = -sx; i < 0; i++)
if (bin_distance(i,j,0) < cutneighmaxsq) {
stencilxyz[pos][0] = i;
stencilxyz[pos][1] = j;
stencilxyz[pos][2] = 0;
stencil[pos++] = j*mbinx + i;
}
// nstencil_ssa[8] = pos;
nstencil = pos; // record where full stencil ends
}

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