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fix_pimd.h
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Fri, Jul 5, 23:03

fix_pimd.h
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/* -*- c++ -*- ----------------------------------------------------------
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.
------------------------------------------------------------------------- */
#ifdef FIX_CLASS
FixStyle(pimd,FixPIMD)
#else
#ifndef FIX_PIMD_H
#define FIX_PIMD_H
#include "fix.h"
namespace LAMMPS_NS {
class FixPIMD : public Fix {
public:
FixPIMD(class LAMMPS *, int, char **);
int setmask();
void init();
void setup(int);
void post_force(int);
void initial_integrate(int);
void final_integrate();
double memory_usage();
void grow_arrays(int);
void copy_arrays(int,int,int);
int pack_exchange(int,double*);
int unpack_exchange(int,double*);
int pack_restart(int,double*);
void unpack_restart(int,int);
int maxsize_restart();
int size_restart(int);
double compute_vector(int);
int pack_forward_comm(int, int*, double *, int, int*);
void unpack_forward_comm(int, int, double *);
int method;
int np;
double inverse_np;
/* ring-polymer model */
double omega_np, fbond, spring_energy, sp;
int x_last, x_next;
void spring_force();
/* fictious mass */
double fmass, *mass;
/* inter-partition communication */
int max_nsend;
int* tag_send;
double *buf_send;
int max_nlocal;
double *buf_recv, **buf_beads;
int size_plan;
int *plan_send, *plan_recv;
double **comm_ptr;
void comm_init();
void comm_exec(double **);
/* normal-mode operations */
double *lam, **M_x2xp, **M_xp2x, **M_f2fp, **M_fp2f;
int *mode_index;
void nmpimd_init();
void nmpimd_fill(double**);
void nmpimd_transform(double**, double**, double*);
/* Nose-hoover chain integration */
int nhc_offset_one_1, nhc_offset_one_2;
int nhc_size_one_1, nhc_size_one_2;
int nhc_nchain;
bool nhc_ready;
double nhc_temp, dtv, dtf, t_sys;
double **nhc_eta; /* coordinates of NH chains for ring-polymer beads */
double **nhc_eta_dot; /* velocities of NH chains */
double **nhc_eta_dotdot; /* acceleration of NH chains */
double **nhc_eta_mass; /* mass of NH chains */
void nhc_init();
void nhc_update_v();
void nhc_update_x();
};
}
#endif
#endif

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