init_md.c

/*----------------------------------------------------------------------
  SerialReax - Reax Force Field Simulator

  Copyright (2010) Purdue University
  Hasan Metin Aktulga, haktulga@cs.purdue.edu
  Joseph Fogarty, jcfogart@mail.usf.edu
  Sagar Pandit, pandit@usf.edu
  Ananth Y Grama, ayg@cs.purdue.edu

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details:
  <http://www.gnu.org/licenses/>.
  ----------------------------------------------------------------------*/

#include "init_md.h"
#include "allocate.h"
#include "box.h"
#include "forces.h"
#include "grid.h"
#include "GMRES.h"
#include "integrate.h"
#include "neighbors.h"
#include "list.h"
#include "lookup.h"
#include "print_utils.h"
#include "reset_utils.h"
#include "system_props.h"
#include "traj.h"
#include "vector.h"


void Generate_Initial_Velocities( reax_system *system, real T )
{
    int i;
    real scale, norm;


    if ( T <= 0.1 )
    {
        for (i = 0; i < system->N; i++)
            rvec_MakeZero( system->atoms[i].v );
#if defined(DEBUG)
        fprintf( stderr, "no random velocities...\n" );
#endif
    }
    else
    {
        for ( i = 0; i < system->N; i++ )
        {
            rvec_Random( system->atoms[i].v );

            norm = rvec_Norm_Sqr( system->atoms[i].v );
            scale = SQRT( system->reaxprm.sbp[ system->atoms[i].type ].mass *
                          norm / (3.0 * K_B * T) );

            rvec_Scale( system->atoms[i].v, 1.0 / scale, system->atoms[i].v );

            /*fprintf( stderr, "v = %f %f %f\n",
            system->atoms[i].v[0],system->atoms[i].v[1],system->atoms[i].v[2]);
            fprintf( stderr, "scale = %f\n", scale );
            fprintf( stderr, "v = %f %f %f\n",
            system->atoms[i].v[0],system->atoms[i].v[1],system->atoms[i].v[2]);*/
        }
    }
}


void Init_System( reax_system *system, control_params *control,
                  simulation_data *data )
{
    int i;
    rvec dx;

    if ( !control->restart )
        Reset_Atoms( system );

    Compute_Total_Mass( system, data );
    Compute_Center_of_Mass( system, data, stderr );

    /* reposition atoms */
    // just fit the atoms to the periodic box
    if ( control->reposition_atoms == 0 )
    {
        rvec_MakeZero( dx );
    }
    // put the center of mass to the center of the box
    else if ( control->reposition_atoms == 1 )
    {
        rvec_Scale( dx, 0.5, system->box.box_norms );
        rvec_ScaledAdd( dx, -1., data->xcm );
    }
    // put the center of mass to the origin
    else if ( control->reposition_atoms == 2 )
    {
        rvec_Scale( dx, -1., data->xcm );
    }
    else
    {
        fprintf( stderr, "UNKNOWN OPTION: reposition_atoms. Terminating...\n" );
        exit( UNKNOWN_OPTION );
    }

    for ( i = 0; i < system->N; ++i )
    {
        Inc_on_T3( system->atoms[i].x, dx, &(system->box) );
        /*fprintf( stderr, "%6d%2d%8.3f%8.3f%8.3f\n",
          i, system->atoms[i].type,
          system->atoms[i].x[0], system->atoms[i].x[1], system->atoms[i].x[2] );*/
    }

    /* Initialize velocities so that desired init T can be attained */
    if ( !control->restart || (control->restart && control->random_vel) )
        Generate_Initial_Velocities( system, control->T_init );

    Setup_Grid( system );
}


void Init_Simulation_Data( reax_system *system, control_params *control,
                           simulation_data *data, output_controls *out_control,
                           evolve_function *Evolve )
{

    Reset_Simulation_Data( data );

    if ( !control->restart )
        data->step = data->prev_steps = 0;

    switch ( control->ensemble )
    {
    case NVE:
        data->N_f = 3 * system->N;
        *Evolve = Velocity_Verlet_NVE;
        break;


    case NVT:
        data->N_f = 3 * system->N + 1;
        //control->Tau_T = 100 * data->N_f * K_B * control->T_final;
        if ( !control->restart || (control->restart && control->random_vel) )
        {
            data->therm.G_xi = control->Tau_T * (2.0 * data->E_Kin -
                                                 data->N_f * K_B * control->T );
            data->therm.v_xi = data->therm.G_xi * control->dt;
            data->therm.v_xi_old = 0;
            data->therm.xi = 0;
#if defined(DEBUG_FOCUS)
            fprintf( stderr, "init_md: G_xi=%f Tau_T=%f E_kin=%f N_f=%f v_xi=%f\n",
                     data->therm.G_xi, control->Tau_T, data->E_Kin,
                     data->N_f, data->therm.v_xi );
#endif
        }

        *Evolve = Velocity_Verlet_Nose_Hoover_NVT_Klein;
        break;


    case NPT: // Anisotropic NPT
        fprintf( stderr, "THIS OPTION IS NOT YET IMPLEMENTED! TERMINATING...\n" );
        exit( UNKNOWN_OPTION );
        data->N_f = 3 * system->N + 9;
        if ( !control->restart )
        {
            data->therm.G_xi = control->Tau_T * (2.0 * data->E_Kin -
                                                 data->N_f * K_B * control->T );
            data->therm.v_xi = data->therm.G_xi * control->dt;
            data->iso_bar.eps = 0.33333 * log(system->box.volume);
            //data->inv_W = 1. / (data->N_f*K_B*control->T*SQR(control->Tau_P));
            //Compute_Pressure( system, data, workspace );
        }
        *Evolve = Velocity_Verlet_Berendsen_Isotropic_NPT;
        break;


    case sNPT: // Semi-Isotropic NPT
        data->N_f = 3 * system->N + 4;
        *Evolve = Velocity_Verlet_Berendsen_SemiIsotropic_NPT;
        break;


    case iNPT: // Isotropic NPT
        data->N_f = 3 * system->N + 2;
        *Evolve = Velocity_Verlet_Berendsen_Isotropic_NPT;
        break;

    case bNVT:
        data->N_f = 3 * system->N + 1;
        *Evolve = Velocity_Verlet_Berendsen_NVT;
        fprintf (stderr, " Initializing Velocity_Verlet_Berendsen_NVT .... \n");
        break;

    default:
        break;
    }

    Compute_Kinetic_Energy( system, data );

    /* init timing info */
    data->timing.start = Get_Time( );
    data->timing.total = data->timing.start;
    data->timing.nbrs = 0;
    data->timing.init_forces = 0;
    data->timing.bonded = 0;
    data->timing.nonb = 0;
    data->timing.QEq = 0;
    data->timing.matvecs = 0;
    data->timing.pre_comp = ZERO;
    data->timing.pre_app = ZERO;
    data->timing.spmv = ZERO;
}


void Init_Workspace( reax_system *system, control_params *control,
                     static_storage *workspace )
{
    int i;

    /* Allocate space for hydrogen bond list */
    workspace->hbond_index = (int *) malloc( system->N * sizeof( int ) );

    /* bond order related storage  */
    workspace->total_bond_order = (real *) malloc( system->N * sizeof( real ) );
    workspace->Deltap           = (real *) malloc( system->N * sizeof( real ) );
    workspace->Deltap_boc       = (real *) malloc( system->N * sizeof( real ) );
    workspace->dDeltap_self     = (rvec *) malloc( system->N * sizeof( rvec ) );

    workspace->Delta        = (real *) malloc( system->N * sizeof( real ) );
    workspace->Delta_lp         = (real *) malloc( system->N * sizeof( real ) );
    workspace->Delta_lp_temp    = (real *) malloc( system->N * sizeof( real ) );
    workspace->dDelta_lp        = (real *) malloc( system->N * sizeof( real ) );
    workspace->dDelta_lp_temp   = (real *) malloc( system->N * sizeof( real ) );
    workspace->Delta_e          = (real *) malloc( system->N * sizeof( real ) );
    workspace->Delta_boc        = (real *) malloc( system->N * sizeof( real ) );
    workspace->nlp          = (real *) malloc( system->N * sizeof( real ) );
    workspace->nlp_temp         = (real *) malloc( system->N * sizeof( real ) );
    workspace->Clp          = (real *) malloc( system->N * sizeof( real ) );
    workspace->CdDelta          = (real *) malloc( system->N * sizeof( real ) );
    workspace->vlpex        = (real *) malloc( system->N * sizeof( real ) );

    /* QEq storage */
    workspace->H        = NULL;
    workspace->H_sp     = NULL;
    workspace->L        = NULL;
    workspace->U        = NULL;
    workspace->droptol  = (real *) calloc( system->N, sizeof( real ) );
    workspace->w        = (real *) calloc( system->N, sizeof( real ) );
    workspace->b        = (real *) calloc( system->N * 2, sizeof( real ) );
    workspace->b_s      = (real *) calloc( system->N, sizeof( real ) );
    workspace->b_t      = (real *) calloc( system->N, sizeof( real ) );
    workspace->b_prc    = (real *) calloc( system->N * 2, sizeof( real ) );
    workspace->b_prm    = (real *) calloc( system->N * 2, sizeof( real ) );
    workspace->s_t      = (real *) calloc( system->N * 2, sizeof( real ) );
    workspace->s        = (real**) calloc( 5, sizeof( real* ) );
    workspace->t        = (real**) calloc( 5, sizeof( real* ) );
    for ( i = 0; i < 5; ++i )
    {
        workspace->s[i] = (real *) calloc( system->N, sizeof( real ) );
        workspace->t[i] = (real *) calloc( system->N, sizeof( real ) );
    }
    // workspace->s_old    = (real *) calloc( system->N, sizeof( real ) );
    // workspace->t_old    = (real *) calloc( system->N, sizeof( real ) );
    // workspace->s_oldest = (real *) calloc( system->N, sizeof( real ) );
    // workspace->t_oldest = (real *) calloc( system->N, sizeof( real ) );

    for ( i = 0; i < system->N; ++i )
    {
        workspace->b_s[i] = -system->reaxprm.sbp[ system->atoms[i].type ].chi;
        workspace->b_t[i] = -1.0;

        workspace->b[i] = -system->reaxprm.sbp[ system->atoms[i].type ].chi;
        workspace->b[i + system->N] = -1.0;
    }

    /* GMRES storage */
    workspace->y  = (real *)  calloc( RESTART + 1, sizeof( real ) );
    workspace->z  = (real *)  calloc( RESTART + 1, sizeof( real ) );
    workspace->g  = (real *)  calloc( RESTART + 1, sizeof( real ) );
    workspace->h  = (real **) calloc( RESTART + 1, sizeof( real*) );
    workspace->hs = (real *)  calloc( RESTART + 1, sizeof( real ) );
    workspace->hc = (real *)  calloc( RESTART + 1, sizeof( real ) );
    workspace->rn = (real **) calloc( RESTART + 1, sizeof( real*) );
    workspace->v  = (real **) calloc( RESTART + 1, sizeof( real*) );

    for ( i = 0; i < RESTART + 1; ++i )
    {
        workspace->h[i]  = (real *) calloc( RESTART + 1, sizeof( real ) );
        workspace->rn[i] = (real *) calloc( system->N * 2, sizeof( real ) );
        workspace->v[i]  = (real *) calloc( system->N, sizeof( real ) );
    }

    /* CG storage */
    workspace->r = (real *) calloc( system->N, sizeof( real ) );
    workspace->d = (real *) calloc( system->N, sizeof( real ) );
    workspace->q = (real *) calloc( system->N, sizeof( real ) );
    workspace->p = (real *) calloc( system->N, sizeof( real ) );


    /* integrator storage */
    workspace->a = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_old = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->v_const = (rvec *) malloc( system->N * sizeof( rvec ) );


    /* storage for analysis */
    if ( control->molec_anal || control->diffusion_coef )
    {
        workspace->mark = (int *) calloc( system->N, sizeof(int) );
        workspace->old_mark = (int *) calloc( system->N, sizeof(int) );
    }
    else
        workspace->mark = workspace->old_mark = NULL;

    if ( control->diffusion_coef )
        workspace->x_old = (rvec *) calloc( system->N, sizeof( rvec ) );
    else workspace->x_old = NULL;


#ifdef TEST_FORCES
    workspace->dDelta = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_ele = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_vdw = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_bo = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_be = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_lp = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_ov = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_un = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_ang = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_coa = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_pen = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_hb = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_tor = (rvec *) malloc( system->N * sizeof( rvec ) );
    workspace->f_con = (rvec *) malloc( system->N * sizeof( rvec ) );
#endif

    workspace->realloc.num_far = -1;
    workspace->realloc.Htop = -1;
    workspace->realloc.hbonds = -1;
    workspace->realloc.bonds = -1;
    workspace->realloc.num_3body = -1;
    workspace->realloc.gcell_atoms = -1;

    Reset_Workspace( system, workspace );
}


void Init_Lists( reax_system *system, control_params *control,
                 simulation_data *data, static_storage *workspace,
                 list **lists, output_controls *out_control )
{
    int i, num_nbrs, num_hbonds, num_bonds, num_3body, Htop;
    int *hb_top, *bond_top;

    num_nbrs = Estimate_NumNeighbors( system, control, workspace, lists );
    if ( !Make_List(system->N, num_nbrs, TYP_FAR_NEIGHBOR, (*lists) + FAR_NBRS) )
    {
        fprintf(stderr, "Problem in initializing far nbrs list. Terminating!\n");
        exit( INIT_ERR );
    }
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "memory allocated: far_nbrs = %ldMB\n",
             num_nbrs * sizeof(far_neighbor_data) / (1024 * 1024) );
#endif

    Generate_Neighbor_Lists(system, control, data, workspace, lists, out_control);
    Htop = 0;
    hb_top = (int*) calloc( system->N, sizeof(int) );
    bond_top = (int*) calloc( system->N, sizeof(int) );
    num_3body = 0;
    Estimate_Storage_Sizes( system, control, lists,
                            &Htop, hb_top, bond_top, &num_3body );

    Allocate_Matrix( &(workspace->H), system->N, Htop );
    /* TODO: better estimate for H_sp?
     *   If so, need to refactor Estimate_Storage_Sizes
     *   to use various cut-off distances as parameters
     *   (non-bonded, hydrogen, 3body, etc.) */
    Allocate_Matrix( &(workspace->H_sp), system->N, Htop );
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "estimated storage - Htop: %d\n", Htop );
    fprintf( stderr, "memory allocated: H = %ldMB\n",
             Htop * sizeof(sparse_matrix_entry) / (1024 * 1024) );
#endif

    workspace->num_H = 0;
    if ( control->hb_cut > 0 )
    {
        /* init H indexes */
        for ( i = 0; i < system->N; ++i )
            if ( system->reaxprm.sbp[ system->atoms[i].type ].p_hbond == 1 ) // H atom
                workspace->hbond_index[i] = workspace->num_H++;
            else workspace->hbond_index[i] = -1;

        Allocate_HBond_List( system->N, workspace->num_H, workspace->hbond_index,
                             hb_top, (*lists) + HBONDS );
        num_hbonds = hb_top[system->N - 1];
#if defined(DEBUG_FOCUS)
        fprintf( stderr, "estimated storage - num_hbonds: %d\n", num_hbonds );
        fprintf( stderr, "memory allocated: hbonds = %ldMB\n",
                 num_hbonds * sizeof(hbond_data) / (1024 * 1024) );
#endif
    }

    /* bonds list */
    Allocate_Bond_List( system->N, bond_top, (*lists) + BONDS );
    num_bonds = bond_top[system->N - 1];
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "estimated storage - num_bonds: %d\n", num_bonds );
    fprintf( stderr, "memory allocated: bonds = %ldMB\n",
             num_bonds * sizeof(bond_data) / (1024 * 1024) );
#endif

//fprintf (stderr, " **** sizeof 3 body : %d \n", sizeof (three_body_interaction_data));
//fprintf (stderr, " **** num_3body : %d \n", num_3body);
//fprintf (stderr, " **** num_bonds : %d \n", num_bonds);

    /* 3bodies list */
    if (!Make_List(num_bonds, num_3body, TYP_THREE_BODY, (*lists) + THREE_BODIES))
    {
        fprintf( stderr, "Problem in initializing angles list. Terminating!\n" );
        exit( INIT_ERR );
    }
#if defined(DEBUG_FOCUS)
    fprintf( stderr, "estimated storage - num_3body: %d\n", num_3body );
    fprintf( stderr, "memory allocated: 3-body = %ldMB\n",
             num_3body * sizeof(three_body_interaction_data) / (1024 * 1024) );
#endif
#ifdef TEST_FORCES
    if (!Make_List( system->N, num_bonds * 8, TYP_DDELTA, (*lists) + DDELTA ))
    {
        fprintf( stderr, "Problem in initializing dDelta list. Terminating!\n" );
        exit( INIT_ERR );
    }

    if ( !Make_List( num_bonds, num_bonds * MAX_BONDS * 3, TYP_DBO, (*lists) + DBO ) )
    {
        fprintf( stderr, "Problem in initializing dBO list. Terminating!\n" );
        exit( INIT_ERR );
    }
#endif

    free( hb_top );
    free( bond_top );
}


void Init_Out_Controls(reax_system *system, control_params *control,
                       static_storage *workspace, output_controls *out_control)
{
    char temp[1000];

    /* Init trajectory file */
    if ( out_control->write_steps > 0 )
    {
        strcpy( temp, control->sim_name );
        strcat( temp, ".trj" );
        out_control->trj = fopen( temp, "w" );
        out_control->write_header( system, control, workspace, out_control );
    }

    if ( out_control->energy_update_freq > 0 )
    {
        /* Init out file */
        strcpy( temp, control->sim_name );
        strcat( temp, ".out" );
        out_control->out = fopen( temp, "w" );
        fprintf( out_control->out, "%-6s%16s%16s%16s%11s%11s%13s%13s%13s\n",
                 "step", "total energy", "poten. energy", "kin. energy",
                 "temp.", "target", "volume", "press.", "target" );
        fflush( out_control->out );

        /* Init potentials file */
        strcpy( temp, control->sim_name );
        strcat( temp, ".pot" );
        out_control->pot = fopen( temp, "w" );
        fprintf( out_control->pot,
                 "%-6s%13s%13s%13s%13s%13s%13s%13s%13s%13s%13s%13s\n",
                 "step", "ebond", "eatom", "elp", "eang", "ecoa", "ehb",
                 "etor", "econj", "evdw", "ecoul", "epol" );
        fflush( out_control->pot );

        /* Init log file */
        strcpy( temp, control->sim_name );
        strcat( temp, ".log" );
        out_control->log = fopen( temp, "w" );
        fprintf( out_control->log, "%-6s%10s%10s%10s%10s%10s%10s%10s%10s%10s%10s\n",
                 "step", "total", "neighbors", "init", "bonded",
                 "nonbonded", "QEq", "matvec", "pre comp", "pre app", "spmv" );
    }

    /* Init pressure file */
    if ( control->ensemble == NPT ||
            control->ensemble == iNPT ||
            control->ensemble == sNPT )
    {
        strcpy( temp, control->sim_name );
        strcat( temp, ".prs" );
        out_control->prs = fopen( temp, "w" );
        fprintf( out_control->prs, "%-6s%13s%13s%13s%13s%13s%13s%13s%13s\n",
                 "step", "norm_x", "norm_y", "norm_z",
                 "press_x", "press_y", "press_z", "target_p", "volume" );
        fflush( out_control->prs );
    }

    /* Init molecular analysis file */
    if ( control->molec_anal )
    {
        sprintf( temp, "%s.mol", control->sim_name );
        out_control->mol = fopen( temp, "w" );
        if ( control->num_ignored )
        {
            sprintf( temp, "%s.ign", control->sim_name );
            out_control->ign = fopen( temp, "w" );
        }
    }

    /* Init electric dipole moment analysis file */
    if ( control->dipole_anal )
    {
        strcpy( temp, control->sim_name );
        strcat( temp, ".dpl" );
        out_control->dpl = fopen( temp, "w" );
        fprintf( out_control->dpl,
                 "Step      Molecule Count  Avg. Dipole Moment Norm\n" );
        fflush( out_control->dpl );
    }

    /* Init diffusion coef analysis file */
    if ( control->diffusion_coef )
    {
        strcpy( temp, control->sim_name );
        strcat( temp, ".drft" );
        out_control->drft = fopen( temp, "w" );
        fprintf( out_control->drft, "Step     Type Count   Avg Squared Disp\n" );
        fflush( out_control->drft );
    }


#ifdef TEST_ENERGY
    /* open bond energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".ebond" );
    out_control->ebond = fopen( temp, "w" );

    /* open lone-pair energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".elp" );
    out_control->elp = fopen( temp, "w" );

    /* open overcoordination energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".eov" );
    out_control->eov = fopen( temp, "w" );

    /* open undercoordination energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".eun" );
    out_control->eun = fopen( temp, "w" );

    /* open angle energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".eval" );
    out_control->eval = fopen( temp, "w" );

    /* open penalty energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".epen" );
    out_control->epen = fopen( temp, "w" );

    /* open coalition energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".ecoa" );
    out_control->ecoa = fopen( temp, "w" );

    /* open hydrogen bond energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".ehb" );
    out_control->ehb = fopen( temp, "w" );

    /* open torsion energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".etor" );
    out_control->etor = fopen( temp, "w" );

    /* open conjugation energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".econ" );
    out_control->econ = fopen( temp, "w" );

    /* open vdWaals energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".evdw" );
    out_control->evdw = fopen( temp, "w" );

    /* open coulomb energy file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".ecou" );
    out_control->ecou = fopen( temp, "w" );
#endif


#ifdef TEST_FORCES
    /* open bond orders file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".fbo" );
    out_control->fbo = fopen( temp, "w" );

    /* open bond orders derivatives file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".fdbo" );
    out_control->fdbo = fopen( temp, "w" );

    /* open bond forces file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".fbond" );
    out_control->fbond = fopen( temp, "w" );

    /* open lone-pair forces file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".flp" );
    out_control->flp = fopen( temp, "w" );

    /* open overcoordination forces file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".fatom" );
    out_control->fatom = fopen( temp, "w" );

    /* open angle forces file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".f3body" );
    out_control->f3body = fopen( temp, "w" );

    /* open hydrogen bond forces file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".fhb" );
    out_control->fhb = fopen( temp, "w" );

    /* open torsion forces file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".f4body" );
    out_control->f4body = fopen( temp, "w" );

    /* open nonbonded forces file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".fnonb" );
    out_control->fnonb = fopen( temp, "w" );

    /* open total force file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".ftot" );
    out_control->ftot = fopen( temp, "w" );

    /* open coulomb forces file */
    strcpy( temp, control->sim_name );
    strcat( temp, ".ftot2" );
    out_control->ftot2 = fopen( temp, "w" );
#endif


    /* Error handling */
    /* if ( out_control->out == NULL || out_control->pot == NULL ||
       out_control->log == NULL || out_control->mol == NULL ||
       out_control->dpl == NULL || out_control->drft == NULL ||
       out_control->pdb == NULL )
       {
       fprintf( stderr, "FILE OPEN ERROR. TERMINATING..." );
       exit( CANNOT_OPEN_OUTFILE );
       }*/
}


void Initialize(reax_system *system, control_params *control,
                simulation_data *data, static_storage *workspace, list **lists,
                output_controls *out_control, evolve_function *Evolve)
{
    real start, end;
    Randomize();

    Init_System( system, control, data );

    Init_Simulation_Data( system, control, data, out_control, Evolve );

    Init_Workspace( system, control, workspace );

    Init_Lists( system, control, data, workspace, lists, out_control );

    Init_Out_Controls( system, control, workspace, out_control );

    /* These are done in forces.c, only forces.c can see all those functions */
    Init_Bonded_Force_Functions( control );
#ifdef TEST_FORCES
    Init_Force_Test_Functions( );
#endif

    if ( control->tabulate )
    {
        start = Get_Time ();
        Make_LR_Lookup_Table( system, control );
        end = Get_Timing_Info (start);

        //fprintf (stderr, "Time for LR Lookup Table calculation is %f \n", end );
    }

#if defined(DEBUG_FOCUS)
    fprintf( stderr, "data structures have been initialized...\n" );
#endif
}