2 * sic.c - investigation of the sic precipitation process of silicon carbide
4 * author: Frank Zirkelbach <frank.zirkelbach@physik.uni-augsburg.de>
11 #include "math/math.h"
12 #include "init/init.h"
13 #include "visual/visual.h"
17 int main(int argc,char **argv) {
18 /* main moldyn structure */
21 /* potential parameters */
24 t_tersoff_mult_params tp;
30 tau=1.0e-15; /* delta t = 1 fs */
32 /* initialize moldyn */
33 printf("[sic] moldyn init\n");
34 moldyn_init(&md,argc,argv);
36 /* choose integration algorithm */
37 printf("[sic] setting integration algorithm\n");
38 set_int_alg(&md,MOLDYN_INTEGRATE_VERLET);
40 /* choose potential */
41 printf("[sic] selecting potential\n");
42 set_potential1b(&md,tersoff_mult_1bp,&tp);
43 set_potential2b(&md,tersoff_mult_2bp,&tp);
44 set_potential3b(&md,tersoff_mult_3bp,&tp);
45 //set_potential2b(&md,lennard_jones,&lj);
48 * potential parameters
52 lj.sigma6=LJ_SIGMA_SI*LJ_SIGMA_SI*LJ_SIGMA_SI;
54 lj.sigma12=lj.sigma6*lj.sigma6;
55 lj.epsilon4=4.0*LJ_EPSILON_SI;
57 /* harmonic oscillator */
58 ho.equilibrium_distance=0.25*sqrt(3.0)*LC_SI;
62 * tersoff mult potential parameters for SiC
68 tp.lambda[0]=TM_LAMBDA_SI;
70 tp.beta[0]=TM_BETA_SI;
80 tp.lambda[1]=TM_LAMBDA_C;
89 tersoff_mult_complete_params(&tp);
92 printf("[sic] setting cutoff radius\n");
93 set_cutoff(&md,TM_S_SI);
95 /* set (initial) dimensions of simulation volume */
96 printf("[sic] setting dimensions\n");
97 set_dim(&md,4*LC_SI,4*LC_SI,4*LC_SI,TRUE);
99 /* set periodic boundary conditions in all directions */
100 printf("[sic] setting periodic boundary conditions\n");
101 set_pbc(&md,TRUE,TRUE,TRUE);
103 /* create the lattice / place atoms */
104 printf("[sic] creating atoms\n");
105 create_lattice(&md,DIAMOND,LC_SI,SI,M_SI,
106 ATOM_ATTR_1BP|ATOM_ATTR_2BP|ATOM_ATTR_3BP|ATOM_ATTR_HB,
107 //ATOM_ATTR_2BP|ATOM_ATTR_HB,
110 /* setting a nearest neighbour distance for the moldyn checks */
111 set_nn_dist(&md,sqrt(3.0)*LC_SI/4.0); /* diamond ! */
113 /* set temperature */
114 printf("[sic] setting temperature\n");
115 set_temperature(&md,0.0);
117 /* set p/t scaling */
118 printf("[sic] set p/t scaling\n");
119 set_pt_scale(&md,0,0,T_SCALE_BERENDSEN,100*tau);
121 /* initial thermal fluctuations of particles (in equilibrium) */
122 printf("[sic] thermal init\n");
123 thermal_init(&md,TRUE);
125 /* create the simulation schedule */
126 printf("[sic] adding schedule\n");
127 moldyn_add_schedule(&md,100,1.0e-15);
129 /* activate logging */
130 printf("[sic] activate logging\n");
131 moldyn_set_log(&md,LOG_TOTAL_ENERGY,"saves/test-energy",1);
132 moldyn_set_log(&md,VISUAL_STEP,"saves/test-visual",1);
135 * let's do the actual md algorithm now
137 * integration of newtons equations
140 printf("[sic] integration start, go get a coffee ...\n");
141 moldyn_integrate(&md);
145 printf("[sic] shutdown\n");
146 moldyn_shutdown(&md);