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lammps/src/RIGID/fix_rigid_npt_small.cpp
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fix_rigid_npt_small.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 author: Trung Dac Nguyen (ORNL)
references: Kamberaj et al., J. Chem. Phys. 122, 224114 (2005)
Miller et al., J Chem Phys. 116, 8649-8659 (2002)
------------------------------------------------------------------------- */
#include <string.h>
#include "fix_rigid_npt_small.h"
#include "domain.h"
#include "modify.h"
#include "error.h"
using namespace LAMMPS_NS;
/* ---------------------------------------------------------------------- */
FixRigidNPTSmall::FixRigidNPTSmall(LAMMPS *lmp, int narg, char **arg) :
FixRigidNHSmall(lmp, narg, arg)
{
// other setting are made by parent
scalar_flag = 1;
restart_global = 1;
box_change_size = 1;
extscalar = 1;
// error checks
if (tstat_flag == 0 || pstat_flag == 0)
error->all(FLERR,"Did not set temp or press for fix rigid/npt/small");
if (t_start <= 0.0 || t_stop <= 0.0)
error->all(FLERR,"Target temperature for fix rigid/npt/small cannot be 0.0");
if (p_start[0] < 0.0 || p_start[1] < 0.0 || p_start[2] < 0.0 ||
p_stop[0] < 0.0 || p_stop[1] < 0.0 || p_stop[2] < 0.0)
error->all(FLERR,"Target pressure for fix rigid/npt/small cannot be < 0.0");
if (t_period <= 0.0) error->all(FLERR,"Fix rigid/npt/small period must be > 0.0");
// thermostat chain parameters
if (t_chain < 1) error->all(FLERR,"Fix rigid npt/small t_chain should not be less than 1");
if (t_iter < 1) error->all(FLERR,"Fix rigid npt/small t_chain should not be less than 1");
if (t_order != 3 && t_order != 5)
error->all(FLERR,"Fix rigid npt/small t_order must be 3 or 5");
// convert input periods to frequency
t_freq = 0.0;
p_freq[0] = p_freq[1] = p_freq[2] = 0.0;
t_freq = 1.0 / t_period;
if (p_flag[0]) p_freq[0] = 1.0 / p_period[0];
if (p_flag[1]) p_freq[1] = 1.0 / p_period[1];
if (p_flag[2]) p_freq[2] = 1.0 / p_period[2];
// create a new compute temp style
// id = fix-ID + temp
// compute group = all since pressure is always global (group all)
// and thus its KE/temperature contribution should use group all
int n = strlen(id) + 6;
id_temp = new char[n];
strcpy(id_temp,id);
strcat(id_temp,"_temp");
char **newarg = new char*[3];
newarg[0] = id_temp;
newarg[1] = (char *) "all";
newarg[2] = (char *) "temp";
modify->add_compute(3,newarg);
delete [] newarg;
tcomputeflag = 1;
// create a new compute pressure style
// id = fix-ID + press, compute group = all
// pass id_temp as 4th arg to pressure constructor
n = strlen(id) + 7;
id_press = new char[n];
strcpy(id_press,id);
strcat(id_press,"_press");
newarg = new char*[4];
newarg[0] = id_press;
newarg[1] = (char *) "all";
newarg[2] = (char *) "pressure";
newarg[3] = id_temp;
modify->add_compute(4,newarg);
delete [] newarg;
pcomputeflag = 1;
}
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