X-Git-Url: https://www.hackdaworld.org/gitweb/?a=blobdiff_plain;f=moldyn.c;h=9a62b9f7c93d5142f5b15d57d099f4ba160604ce;hb=ea612b88a0588b8f46fafaebf3b37fb46c83c0cf;hp=f6c3c81d4bbf95b5787474dbd03e18bea90e183e;hpb=cb177e7c208a85b45d77b09fcada23b62d0248b5;p=physik%2Fposic.git diff --git a/moldyn.c b/moldyn.c index f6c3c81..9a62b9f 100644 --- a/moldyn.c +++ b/moldyn.c @@ -162,34 +162,37 @@ int set_pbc(t_moldyn *moldyn,u8 x,u8 y,u8 z) { return 0; } -int set_potential1b(t_moldyn *moldyn,pf_func1b func,void *params) { +int set_potential1b(t_moldyn *moldyn,pf_func1b func) { moldyn->func1b=func; - moldyn->pot1b_params=params; return 0; } -int set_potential2b(t_moldyn *moldyn,pf_func2b func,void *params) { +int set_potential2b(t_moldyn *moldyn,pf_func2b func) { moldyn->func2b=func; - moldyn->pot2b_params=params; return 0; } -int set_potential2b_post(t_moldyn *moldyn,pf_func2b_post func,void *params) { +int set_potential2b_post(t_moldyn *moldyn,pf_func2b_post func) { moldyn->func2b_post=func; - moldyn->pot2b_params=params; return 0; } -int set_potential3b(t_moldyn *moldyn,pf_func3b func,void *params) { +int set_potential3b(t_moldyn *moldyn,pf_func3b func) { moldyn->func3b=func; - moldyn->pot3b_params=params; + + return 0; +} + +int set_potential_params(t_moldyn *moldyn,void *params) { + + moldyn->pot_params=params; return 0; } @@ -243,6 +246,32 @@ int moldyn_set_log(t_moldyn *moldyn,u8 type,int timer) { dprintf(moldyn->efd,"# total momentum log file\n"); printf("total momentum (%d)\n",timer); break; + case LOG_PRESSURE: + moldyn->pwrite=timer; + snprintf(filename,127,"%s/pressure",moldyn->vlsdir); + moldyn->pfd=open(filename, + O_WRONLY|O_CREAT|O_EXCL, + S_IRUSR|S_IWUSR); + if(moldyn->pfd<0) { + perror("[moldyn] pressure log file\n"); + return moldyn->pfd; + } + dprintf(moldyn->pfd,"# pressure log file\n"); + printf("pressure (%d)\n",timer); + break; + case LOG_TEMPERATURE: + moldyn->twrite=timer; + snprintf(filename,127,"%s/temperature",moldyn->vlsdir); + moldyn->tfd=open(filename, + O_WRONLY|O_CREAT|O_EXCL, + S_IRUSR|S_IWUSR); + if(moldyn->tfd<0) { + perror("[moldyn] temperature log file\n"); + return moldyn->tfd; + } + dprintf(moldyn->tfd,"# temperature log file\n"); + printf("temperature (%d)\n",timer); + break; case SAVE_STEP: moldyn->swrite=timer; printf("save file (%d)\n",timer); @@ -265,18 +294,47 @@ int moldyn_set_log(t_moldyn *moldyn,u8 type,int timer) { perror("[moldyn] report fd open"); return moldyn->rfd; } - snprintf(filename,127,"%s/plot.scr",moldyn->vlsdir); - moldyn->pfd=open(filename, - O_WRONLY|O_CREAT|O_EXCL, - S_IRUSR|S_IWUSR); - if(moldyn->pfd<0) { - perror("[moldyn] plot fd open"); - return moldyn->pfd; + if(moldyn->efd) { + snprintf(filename,127,"%s/e_plot.scr", + moldyn->vlsdir); + moldyn->epfd=open(filename, + O_WRONLY|O_CREAT|O_EXCL, + S_IRUSR|S_IWUSR); + if(moldyn->epfd<0) { + perror("[moldyn] energy plot fd open"); + return moldyn->epfd; + } + dprintf(moldyn->epfd,e_plot_script); + close(moldyn->epfd); + } + if(moldyn->pfd) { + snprintf(filename,127,"%s/pressure_plot.scr", + moldyn->vlsdir); + moldyn->ppfd=open(filename, + O_WRONLY|O_CREAT|O_EXCL, + S_IRUSR|S_IWUSR); + if(moldyn->ppfd<0) { + perror("[moldyn] p plot fd open"); + return moldyn->ppfd; + } + dprintf(moldyn->ppfd,pressure_plot_script); + close(moldyn->ppfd); + } + if(moldyn->tfd) { + snprintf(filename,127,"%s/temperature_plot.scr", + moldyn->vlsdir); + moldyn->tpfd=open(filename, + O_WRONLY|O_CREAT|O_EXCL, + S_IRUSR|S_IWUSR); + if(moldyn->tpfd<0) { + perror("[moldyn] t plot fd open"); + return moldyn->tpfd; + } + dprintf(moldyn->tpfd,temperature_plot_script); + close(moldyn->tpfd); } dprintf(moldyn->rfd,report_start, moldyn->rauthor,moldyn->rtitle); - dprintf(moldyn->pfd,plot_script); - close(moldyn->pfd); break; default: printf("unknown log type: %02x\n",type); @@ -291,13 +349,35 @@ int moldyn_log_shutdown(t_moldyn *moldyn) { char sc[256]; printf("[moldyn] log shutdown\n"); - if(moldyn->efd) close(moldyn->efd); + if(moldyn->efd) { + close(moldyn->efd); + if(moldyn->rfd) { + dprintf(moldyn->rfd,report_energy); + snprintf(sc,255,"cd %s && gnuplot e_plot.scr", + moldyn->vlsdir); + system(sc); + } + } if(moldyn->mfd) close(moldyn->mfd); + if(moldyn->pfd) { + close(moldyn->pfd); + if(moldyn->rfd) + dprintf(moldyn->rfd,report_pressure); + snprintf(sc,255,"cd %s && gnuplot pressure_plot.scr", + moldyn->vlsdir); + system(sc); + } + if(moldyn->tfd) { + close(moldyn->tfd); + if(moldyn->rfd) + dprintf(moldyn->rfd,report_temperature); + snprintf(sc,255,"cd %s && gnuplot temperature_plot.scr", + moldyn->vlsdir); + system(sc); + } if(moldyn->rfd) { dprintf(moldyn->rfd,report_end); close(moldyn->rfd); - snprintf(sc,255,"cd %s && gnuplot plot.scr",moldyn->vlsdir); - system(sc); snprintf(sc,255,"cd %s && pdflatex report",moldyn->vlsdir); system(sc); snprintf(sc,255,"cd %s && pdflatex report",moldyn->vlsdir); @@ -673,9 +753,11 @@ double pressure_calc(t_moldyn *moldyn) { t_virial *virial; /* - * P = 1/(3V) sum_i ( p_i^2 / 2m + f_i r_i ) - * - * virial = f_i r_i + * PV = NkT + + * W = 1/3 sum_i f_i r_i + * virial = sum_i f_i r_i + * + * => P = (2 Ekin + virial) / (3V) */ v=0.0; @@ -695,9 +777,20 @@ double thermodynamic_pressure_calc(t_moldyn *moldyn) { t_3dvec dim,*tp; double u,p; - double scale; + double scale,dv; t_atom *store; + /* + * dU = - p dV + * + * => p = - dU/dV + * + * dV: dx,y,z = 0.001 x,y,z + */ + + scale=1.00001; +printf("\n\nP-DEBUG:\n"); + tp=&(moldyn->tp); store=malloc(moldyn->count*sizeof(t_atom)); if(store==NULL) { @@ -711,27 +804,28 @@ double thermodynamic_pressure_calc(t_moldyn *moldyn) { dim=moldyn->dim; /* derivative with respect to x direction */ - scale=1.0+moldyn->dv/(moldyn->dim.y*moldyn->dim.z); scale_dim(moldyn,scale,TRUE,0,0); scale_atoms(moldyn,scale,TRUE,0,0); + dv=0.00001*moldyn->dim.x*moldyn->dim.y*moldyn->dim.z; link_cell_shutdown(moldyn); link_cell_init(moldyn,QUIET); potential_force_calc(moldyn); - tp->x=(moldyn->energy-u)/moldyn->dv; + tp->x=(moldyn->energy-u)/dv; p=tp->x*tp->x; +printf("e: %f eV de: %f eV dV: %f A^3\n",moldyn->energy/moldyn->count/EV,(moldyn->energy-u)/moldyn->count/EV,dv); /* restore atomic configuration + dim */ memcpy(moldyn->atom,store,moldyn->count*sizeof(t_atom)); moldyn->dim=dim; /* derivative with respect to y direction */ - scale=1.0+moldyn->dv/(moldyn->dim.x*moldyn->dim.z); scale_dim(moldyn,scale,0,TRUE,0); scale_atoms(moldyn,scale,0,TRUE,0); + dv=0.00001*moldyn->dim.y*moldyn->dim.x*moldyn->dim.z; link_cell_shutdown(moldyn); link_cell_init(moldyn,QUIET); potential_force_calc(moldyn); - tp->y=(moldyn->energy-u)/moldyn->dv; + tp->y=(moldyn->energy-u)/dv; p+=tp->y*tp->y; /* restore atomic configuration + dim */ @@ -739,37 +833,19 @@ double thermodynamic_pressure_calc(t_moldyn *moldyn) { moldyn->dim=dim; /* derivative with respect to z direction */ - scale=1.0+moldyn->dv/(moldyn->dim.x*moldyn->dim.y); scale_dim(moldyn,scale,0,0,TRUE); scale_atoms(moldyn,scale,0,0,TRUE); + dv=0.00001*moldyn->dim.z*moldyn->dim.x*moldyn->dim.y; link_cell_shutdown(moldyn); link_cell_init(moldyn,QUIET); potential_force_calc(moldyn); - tp->z=(moldyn->energy-u)/moldyn->dv; + tp->z=(moldyn->energy-u)/dv; p+=tp->z*tp->z; /* restore atomic configuration + dim */ memcpy(moldyn->atom,store,moldyn->count*sizeof(t_atom)); moldyn->dim=dim; - printf("dU/dV komp addiert = %f %f %f\n",tp->x,tp->y,tp->z); - - scale=1.0+pow(moldyn->dv/moldyn->volume,ONE_THIRD); - -printf("debug: %f %f\n",moldyn->atom[0].r.x,moldyn->dim.x); - scale_dim(moldyn,scale,1,1,1); - scale_atoms(moldyn,scale,1,1,1); - link_cell_shutdown(moldyn); - link_cell_init(moldyn,QUIET); - potential_force_calc(moldyn); -printf("debug: %f %f\n",moldyn->atom[0].r.x,moldyn->dim.x); - - printf("dU/dV einfach = %f\n",((moldyn->energy-u)/moldyn->dv)/ATM); - - /* restore atomic configuration + dim */ - memcpy(moldyn->atom,store,moldyn->count*sizeof(t_atom)); - moldyn->dim=dim; - /* restore energy */ moldyn->energy=u; @@ -1106,14 +1182,15 @@ int moldyn_set_schedule_hook(t_moldyn *moldyn,set_hook hook,void *hook_params) { int moldyn_integrate(t_moldyn *moldyn) { int i; - unsigned int e,m,s,v; - t_3dvec p; + unsigned int e,m,s,v,p,t; + t_3dvec momentum; t_moldyn_schedule *sched; t_atom *atom; int fd; char dir[128]; double ds; double energy_scale; + //double tp; sched=&(moldyn->schedule); atom=moldyn->atom; @@ -1126,6 +1203,8 @@ int moldyn_integrate(t_moldyn *moldyn) { m=moldyn->mwrite; s=moldyn->swrite; v=moldyn->vwrite; + p=moldyn->pwrite; + t=moldyn->twrite; /* sqaure of some variables */ moldyn->tau_square=moldyn->tau*moldyn->tau; @@ -1176,7 +1255,7 @@ int moldyn_integrate(t_moldyn *moldyn) { update_e_kin(moldyn); temperature_calc(moldyn); pressure_calc(moldyn); - //thermodynamic_pressure_calc(moldyn); + //tp=thermodynamic_pressure_calc(moldyn); /* p/t scaling */ if(moldyn->pt_scale&(T_SCALE_BERENDSEN|T_SCALE_DIRECT)) @@ -1195,9 +1274,23 @@ int moldyn_integrate(t_moldyn *moldyn) { } if(m) { if(!(i%m)) { - p=get_total_p(moldyn); + momentum=get_total_p(moldyn); dprintf(moldyn->mfd, - "%f %f\n",moldyn->time,v3_norm(&p)); + "%f %f %f %f %f\n",moldyn->time, + momentum.x,momentum.y,momentum.z, + v3_norm(&momentum)); + } + } + if(p) { + if(!(i%p)) { + dprintf(moldyn->pfd, + "%f %f\n",moldyn->time,moldyn->p/ATM); + } + } + if(t) { + if(!(i%t)) { + dprintf(moldyn->tfd, + "%f %f\n",moldyn->time,moldyn->t); } } if(s) { @@ -1218,13 +1311,17 @@ int moldyn_integrate(t_moldyn *moldyn) { if(!(i%v)) { visual_atoms(&(moldyn->vis),moldyn->time, moldyn->atom,moldyn->count); - printf("\rsched: %d, steps: %d, T: %f, P: %f V: %f", - sched->count,i, - moldyn->t,moldyn->p/ATM,moldyn->volume); - fflush(stdout); } } + /* display progress */ + if(!(i%10)) { + printf("\rsched: %d, steps: %d, T: %f, P: %f V: %f", + sched->count,i, + moldyn->t,moldyn->p/ATM,moldyn->volume); + fflush(stdout); + } + /* increase absolute time */ moldyn->time+=moldyn->tau; @@ -1449,7 +1546,8 @@ printf("\n\n"); * virial calculation */ -inline int virial_calc(t_atom *a,t_3dvec *f,t_3dvec *d) { +//inline int virial_calc(t_atom *a,t_3dvec *f,t_3dvec *d) { +int virial_calc(t_atom *a,t_3dvec *f,t_3dvec *d) { a->virial.xx+=f->x*d->x; a->virial.yy+=f->y*d->y; @@ -1465,7 +1563,8 @@ inline int virial_calc(t_atom *a,t_3dvec *f,t_3dvec *d) { * periodic boundayr checking */ -inline int check_per_bound(t_moldyn *moldyn,t_3dvec *a) { +//inline int check_per_bound(t_moldyn *moldyn,t_3dvec *a) { +int check_per_bound(t_moldyn *moldyn,t_3dvec *a) { double x,y,z; t_3dvec *dim; @@ -1492,779 +1591,6 @@ inline int check_per_bound(t_moldyn *moldyn,t_3dvec *a) { return 0; } - -/* - * example potentials - */ - -/* harmonic oscillator potential and force */ - -int harmonic_oscillator(t_moldyn *moldyn,t_atom *ai,t_atom *aj,u8 bc) { - - t_ho_params *params; - t_3dvec force,distance; - double d,f; - double sc,equi_dist; - - params=moldyn->pot2b_params; - sc=params->spring_constant; - equi_dist=params->equilibrium_distance; - - if(air),&(ai->r)); - - if(bc) check_per_bound(moldyn,&distance); - d=v3_norm(&distance); - if(d<=moldyn->cutoff) { - moldyn->energy+=(0.5*sc*(d-equi_dist)*(d-equi_dist)); - /* f = -grad E; grad r_ij = -1 1/r_ij distance */ - f=sc*(1.0-equi_dist/d); - v3_scale(&force,&distance,f); - v3_add(&(ai->f),&(ai->f),&force); - virial_calc(ai,&force,&distance); - virial_calc(aj,&force,&distance); /* f and d signe switched */ - v3_scale(&force,&distance,-f); - v3_add(&(aj->f),&(aj->f),&force); - } - - return 0; -} - -/* lennard jones potential & force for one sort of atoms */ - -int lennard_jones(t_moldyn *moldyn,t_atom *ai,t_atom *aj,u8 bc) { - - t_lj_params *params; - t_3dvec force,distance; - double d,h1,h2; - double eps,sig6,sig12; - - params=moldyn->pot2b_params; - eps=params->epsilon4; - sig6=params->sigma6; - sig12=params->sigma12; - - if(air),&(ai->r)); - if(bc) check_per_bound(moldyn,&distance); - d=v3_absolute_square(&distance); /* 1/r^2 */ - if(d<=moldyn->cutoff_square) { - d=1.0/d; /* 1/r^2 */ - h2=d*d; /* 1/r^4 */ - h2*=d; /* 1/r^6 */ - h1=h2*h2; /* 1/r^12 */ - moldyn->energy+=(eps*(sig12*h1-sig6*h2)-params->uc); - h2*=d; /* 1/r^8 */ - h1*=d; /* 1/r^14 */ - h2*=6*sig6; - h1*=12*sig12; - d=+h1-h2; - d*=eps; - v3_scale(&force,&distance,d); - v3_add(&(aj->f),&(aj->f),&force); - v3_scale(&force,&force,-1.0); /* f = - grad E */ - v3_add(&(ai->f),&(ai->f),&force); - virial_calc(ai,&force,&distance); -if(force.x*distance.x<=0) printf("virial xx: %.15f -> %f %f %f\n",force.x*distance.x,distance.x,distance.y,distance.z); - virial_calc(aj,&force,&distance); /* f and d signe switched */ - } - - return 0; -} - -/* - * tersoff potential & force for 2 sorts of atoms - */ - -/* create mixed terms from parameters and set them */ -int tersoff_mult_complete_params(t_tersoff_mult_params *p) { - - printf("[moldyn] tersoff parameter completion\n"); - p->S2[0]=p->S[0]*p->S[0]; - p->S2[1]=p->S[1]*p->S[1]; - p->Smixed=sqrt(p->S[0]*p->S[1]); - p->S2mixed=p->Smixed*p->Smixed; - p->Rmixed=sqrt(p->R[0]*p->R[1]); - p->Amixed=sqrt(p->A[0]*p->A[1]); - p->Bmixed=sqrt(p->B[0]*p->B[1]); - p->lambda_m=0.5*(p->lambda[0]+p->lambda[1]); - p->mu_m=0.5*(p->mu[0]+p->mu[1]); - - printf("[moldyn] tersoff mult parameter info:\n"); - printf(" S (A) | %f | %f | %f\n",p->S[0],p->S[1],p->Smixed); - printf(" R (A) | %f | %f | %f\n",p->R[0],p->R[1],p->Rmixed); - printf(" A (eV) | %f | %f | %f\n",p->A[0]/EV,p->A[1]/EV,p->Amixed/EV); - printf(" B (eV) | %f | %f | %f\n",p->B[0]/EV,p->B[1]/EV,p->Bmixed/EV); - printf(" lambda | %f | %f | %f\n",p->lambda[0],p->lambda[1], - p->lambda_m); - printf(" mu | %f | %f | %f\n",p->mu[0],p->mu[1],p->mu_m); - printf(" beta | %.10f | %.10f\n",p->beta[0],p->beta[1]); - printf(" n | %f | %f\n",p->n[0],p->n[1]); - printf(" c | %f | %f\n",p->c[0],p->c[1]); - printf(" d | %f | %f\n",p->d[0],p->d[1]); - printf(" h | %f | %f\n",p->h[0],p->h[1]); - printf(" chi | %f \n",p->chi); - - return 0; -} - -/* tersoff 1 body part */ -int tersoff_mult_1bp(t_moldyn *moldyn,t_atom *ai) { - - int brand; - t_tersoff_mult_params *params; - t_tersoff_exchange *exchange; - - brand=ai->brand; - params=moldyn->pot1b_params; - exchange=&(params->exchange); - - /* - * simple: point constant parameters only depending on atom i to - * their right values - */ - - exchange->beta_i=&(params->beta[brand]); - exchange->n_i=&(params->n[brand]); - exchange->c_i=&(params->c[brand]); - exchange->d_i=&(params->d[brand]); - exchange->h_i=&(params->h[brand]); - - exchange->betaini=pow(*(exchange->beta_i),*(exchange->n_i)); - exchange->ci2=params->c[brand]*params->c[brand]; - exchange->di2=params->d[brand]*params->d[brand]; - exchange->ci2di2=exchange->ci2/exchange->di2; - - return 0; -} - -/* tersoff 2 body part */ -int tersoff_mult_2bp(t_moldyn *moldyn,t_atom *ai,t_atom *aj,u8 bc) { - - t_tersoff_mult_params *params; - t_tersoff_exchange *exchange; - t_3dvec dist_ij,force; - double d_ij,d_ij2; - double A,B,R,S,S2,lambda,mu; - double f_r,df_r; - double f_c,df_c; - int brand; - double s_r; - double arg; - - params=moldyn->pot2b_params; - brand=aj->brand; - exchange=&(params->exchange); - - /* clear 3bp and 2bp post run */ - exchange->run3bp=0; - exchange->run2bp_post=0; - - /* reset S > r > R mark */ - exchange->d_ij_between_rs=0; - - /* - * calc of 2bp contribution of V_ij and dV_ij/ji - * - * for Vij and dV_ij we need: - * - f_c_ij, df_c_ij - * - f_r_ij, df_r_ij - * - * for dV_ji we need: - * - f_c_ji = f_c_ij, df_c_ji = df_c_ij - * - f_r_ji = f_r_ij; df_r_ji = df_r_ij - * - */ - - /* constants */ - if(brand==ai->brand) { - S=params->S[brand]; - S2=params->S2[brand]; - R=params->R[brand]; - A=params->A[brand]; - B=params->B[brand]; - lambda=params->lambda[brand]; - mu=params->mu[brand]; - exchange->chi=1.0; - } - else { - S=params->Smixed; - S2=params->S2mixed; - R=params->Rmixed; - A=params->Amixed; - B=params->Bmixed; - lambda=params->lambda_m; - mu=params->mu_m; - params->exchange.chi=params->chi; - } - - /* dist_ij, d_ij */ - v3_sub(&dist_ij,&(aj->r),&(ai->r)); - if(bc) check_per_bound(moldyn,&dist_ij); - d_ij2=v3_absolute_square(&dist_ij); - - /* if d_ij2 > S2 => no force & potential energy contribution */ - if(d_ij2>S2) - return 0; - - /* now we will need the distance */ - //d_ij=v3_norm(&dist_ij); - d_ij=sqrt(d_ij2); - - /* save for use in 3bp */ - exchange->d_ij=d_ij; - exchange->d_ij2=d_ij2; - exchange->dist_ij=dist_ij; - - /* more constants */ - exchange->beta_j=&(params->beta[brand]); - exchange->n_j=&(params->n[brand]); - exchange->c_j=&(params->c[brand]); - exchange->d_j=&(params->d[brand]); - exchange->h_j=&(params->h[brand]); - if(brand==ai->brand) { - exchange->betajnj=exchange->betaini; - exchange->cj2=exchange->ci2; - exchange->dj2=exchange->di2; - exchange->cj2dj2=exchange->ci2di2; - } - else { - exchange->betajnj=pow(*(exchange->beta_j),*(exchange->n_j)); - exchange->cj2=params->c[brand]*params->c[brand]; - exchange->dj2=params->d[brand]*params->d[brand]; - exchange->cj2dj2=exchange->cj2/exchange->dj2; - } - - /* f_r_ij = f_r_ji, df_r_ij = df_r_ji */ - f_r=A*exp(-lambda*d_ij); - df_r=lambda*f_r/d_ij; - - /* f_a, df_a calc (again, same for ij and ji) | save for later use! */ - exchange->f_a=-B*exp(-mu*d_ij); - exchange->df_a=mu*exchange->f_a/d_ij; - - /* f_c, df_c calc (again, same for ij and ji) */ - if(d_ij r > R */ - exchange->d_ij_between_rs=1; - } - - /* add forces of 2bp (ij, ji) contribution - * dVij = dVji and we sum up both: no 1/2) */ - v3_add(&(ai->f),&(ai->f),&force); - - /* virial */ - ai->virial.xx-=force.x*dist_ij.x; - ai->virial.yy-=force.y*dist_ij.y; - ai->virial.zz-=force.z*dist_ij.z; - ai->virial.xy-=force.x*dist_ij.y; - ai->virial.xz-=force.x*dist_ij.z; - ai->virial.yz-=force.y*dist_ij.z; - -#ifdef DEBUG -if(ai==&(moldyn->atom[0])) { - printf("dVij, dVji (2bp) contrib:\n"); - printf("%f | %f\n",force.x,ai->f.x); - printf("%f | %f\n",force.y,ai->f.y); - printf("%f | %f\n",force.z,ai->f.z); -} -#endif -#ifdef VDEBUG -if(ai==&(moldyn->atom[0])) { - printf("dVij, dVji (2bp) contrib:\n"); - printf("%f | %f\n",force.x*dist_ij.x,ai->virial.xx); - printf("%f | %f\n",force.y*dist_ij.y,ai->virial.yy); - printf("%f | %f\n",force.z*dist_ij.z,ai->virial.zz); -} -#endif - - /* energy 2bp contribution (ij, ji) is 0.5 f_r f_c ... */ - moldyn->energy+=(0.5*f_r*f_c); - - /* save for use in 3bp */ - exchange->f_c=f_c; - exchange->df_c=df_c; - - /* enable the run of 3bp function and 2bp post processing */ - exchange->run3bp=1; - exchange->run2bp_post=1; - - /* reset 3bp sums */ - exchange->zeta_ij=0.0; - exchange->zeta_ji=0.0; - v3_zero(&(exchange->dzeta_ij)); - v3_zero(&(exchange->dzeta_ji)); - - return 0; -} - -/* tersoff 2 body post part */ - -int tersoff_mult_post_2bp(t_moldyn *moldyn,t_atom *ai,t_atom *aj,u8 bc) { - - /* - * here we have to allow for the 3bp sums - * - * that is: - * - zeta_ij, dzeta_ij - * - zeta_ji, dzeta_ji - * - * to compute the 3bp contribution to: - * - Vij, dVij - * - dVji - * - */ - - t_tersoff_mult_params *params; - t_tersoff_exchange *exchange; - - t_3dvec force,temp; - t_3dvec *dist_ij; - double b,db,tmp; - double f_c,df_c,f_a,df_a; - double chi,ni,betaini,nj,betajnj; - double zeta; - - params=moldyn->pot2b_params; - exchange=&(params->exchange); - - /* we do not run if f_c_ij was detected to be 0! */ - if(!(exchange->run2bp_post)) - return 0; - - f_c=exchange->f_c; - df_c=exchange->df_c; - f_a=exchange->f_a; - df_a=exchange->df_a; - betaini=exchange->betaini; - betajnj=exchange->betajnj; - ni=*(exchange->n_i); - nj=*(exchange->n_j); - chi=exchange->chi; - dist_ij=&(exchange->dist_ij); - - /* Vij and dVij */ - zeta=exchange->zeta_ij; - if(zeta==0.0) { - moldyn->debug++; /* just for debugging ... */ - b=chi; - v3_scale(&force,dist_ij,df_a*b*f_c); - } - else { - tmp=betaini*pow(zeta,ni-1.0); /* beta^n * zeta^n-1 */ - b=(1+zeta*tmp); /* 1 + beta^n zeta^n */ - db=chi*pow(b,-1.0/(2*ni)-1); /* x(...)^(-1/2n - 1) */ - b=db*b; /* b_ij */ - db*=-0.5*tmp; /* db_ij */ - v3_scale(&force,&(exchange->dzeta_ij),f_a*db); - v3_scale(&temp,dist_ij,df_a*b); - v3_add(&force,&force,&temp); - v3_scale(&force,&force,f_c); - } - v3_scale(&temp,dist_ij,df_c*b*f_a); - v3_add(&force,&force,&temp); - v3_scale(&force,&force,-0.5); - - /* add force */ - v3_add(&(ai->f),&(ai->f),&force); - - /* virial */ - ai->virial.xx-=force.x*dist_ij->x; - ai->virial.yy-=force.y*dist_ij->y; - ai->virial.zz-=force.z*dist_ij->z; - ai->virial.xy-=force.x*dist_ij->y; - ai->virial.xz-=force.x*dist_ij->z; - ai->virial.yz-=force.y*dist_ij->z; - -#ifdef DEBUG -if(ai==&(moldyn->atom[0])) { - printf("dVij (3bp) contrib:\n"); - printf("%f | %f\n",force.x,ai->f.x); - printf("%f | %f\n",force.y,ai->f.y); - printf("%f | %f\n",force.z,ai->f.z); -} -#endif -#ifdef VDEBUG -if(ai==&(moldyn->atom[0])) { - printf("dVij (3bp) contrib:\n"); - printf("%f | %f\n",force.x*dist_ij->x,ai->virial.xx); - printf("%f | %f\n",force.y*dist_ij->y,ai->virial.yy); - printf("%f | %f\n",force.z*dist_ij->z,ai->virial.zz); -} -#endif - - /* add energy of 3bp sum */ - moldyn->energy+=(0.5*f_c*b*f_a); - - /* dVji */ - zeta=exchange->zeta_ji; - if(zeta==0.0) { - moldyn->debug++; - b=chi; - v3_scale(&force,dist_ij,df_a*b*f_c); - } - else { - tmp=betajnj*pow(zeta,nj-1.0); /* beta^n * zeta^n-1 */ - b=(1+zeta*tmp); /* 1 + beta^n zeta^n */ - db=chi*pow(b,-1.0/(2*nj)-1); /* x(...)^(-1/2n - 1) */ - b=db*b; /* b_ij */ - db*=-0.5*tmp; /* db_ij */ - v3_scale(&force,&(exchange->dzeta_ji),f_a*db); - v3_scale(&temp,dist_ij,df_a*b); - v3_add(&force,&force,&temp); - v3_scale(&force,&force,f_c); - } - v3_scale(&temp,dist_ij,df_c*b*f_a); - v3_add(&force,&force,&temp); - v3_scale(&force,&force,-0.5); - - /* add force */ - v3_add(&(ai->f),&(ai->f),&force); - - /* virial - plus sign, as dist_ij = - dist_ji - (really??) */ -// TEST ... with a minus instead - ai->virial.xx-=force.x*dist_ij->x; - ai->virial.yy-=force.y*dist_ij->y; - ai->virial.zz-=force.z*dist_ij->z; - ai->virial.xy-=force.x*dist_ij->y; - ai->virial.xz-=force.x*dist_ij->z; - ai->virial.yz-=force.y*dist_ij->z; - -#ifdef DEBUG -if(ai==&(moldyn->atom[0])) { - printf("dVji (3bp) contrib:\n"); - printf("%f | %f\n",force.x,ai->f.x); - printf("%f | %f\n",force.y,ai->f.y); - printf("%f | %f\n",force.z,ai->f.z); -} -#endif -#ifdef VDEBUG -if(ai==&(moldyn->atom[0])) { - printf("dVji (3bp) contrib:\n"); - printf("%f | %f\n",force.x*dist_ij->x,ai->virial.xx); - printf("%f | %f\n",force.y*dist_ij->y,ai->virial.yy); - printf("%f | %f\n",force.z*dist_ij->z,ai->virial.zz); -} -#endif - - return 0; -} - -/* tersoff 3 body part */ - -int tersoff_mult_3bp(t_moldyn *moldyn,t_atom *ai,t_atom *aj,t_atom *ak,u8 bc) { - - t_tersoff_mult_params *params; - t_tersoff_exchange *exchange; - t_3dvec dist_ij,dist_ik,dist_jk; - t_3dvec temp1,temp2; - t_3dvec *dzeta; - double R,S,S2,s_r; - double B,mu; - double d_ij,d_ik,d_jk,d_ij2,d_ik2,d_jk2; - double rr,dd; - double f_c,df_c; - double f_c_ik,df_c_ik,arg; - double f_c_jk; - double n,c,d,h; - double c2,d2,c2d2; - double cos_theta,d_costheta1,d_costheta2; - double h_cos,d2_h_cos2; - double frac,g,zeta,chi; - double tmp; - int brand; - - params=moldyn->pot3b_params; - exchange=&(params->exchange); - - if(!(exchange->run3bp)) - return 0; - - /* - * calc of 3bp contribution of V_ij and dV_ij/ji/jk & - * 2bp contribution of dV_jk - * - * for Vij and dV_ij we still need: - * - b_ij, db_ij (zeta_ij) - * - f_c_ik, df_c_ik, constants_i, cos_theta_ijk, d_costheta_ijk - * - * for dV_ji we still need: - * - b_ji, db_ji (zeta_ji) - * - f_c_jk, d_c_jk, constants_j, cos_theta_jik, d_costheta_jik - * - * for dV_jk we need: - * - f_c_jk - * - f_a_jk - * - db_jk (zeta_jk) - * - f_c_ji, df_c_ji, constants_j, cos_theta_jki, d_costheta_jki - * - */ - - /* - * get exchange data - */ - - /* dist_ij, d_ij - this is < S_ij ! */ - dist_ij=exchange->dist_ij; - d_ij=exchange->d_ij; - d_ij2=exchange->d_ij2; - - /* f_c_ij, df_c_ij (same for ji) */ - f_c=exchange->f_c; - df_c=exchange->df_c; - - /* - * calculate unknown values now ... - */ - - /* V_ij and dV_ij stuff (in b_ij there is f_c_ik) */ - - /* dist_ik, d_ik */ - v3_sub(&dist_ik,&(ak->r),&(ai->r)); - if(bc) check_per_bound(moldyn,&dist_ik); - d_ik2=v3_absolute_square(&dist_ik); - - /* ik constants */ - brand=ai->brand; - if(brand==ak->brand) { - R=params->R[brand]; - S=params->S[brand]; - S2=params->S2[brand]; - } - else { - R=params->Rmixed; - S=params->Smixed; - S2=params->S2mixed; - } - - /* zeta_ij/dzeta_ij contribution only for d_ik < S */ - if(d_ik2n_i); - c=*(exchange->c_i); - d=*(exchange->d_i); - h=*(exchange->h_i); - c2=exchange->ci2; - d2=exchange->di2; - c2d2=exchange->ci2di2; - - /* cosine of theta_ijk by scalaproduct */ - rr=v3_scalar_product(&dist_ij,&dist_ik); - dd=d_ij*d_ik; - cos_theta=rr/dd; - - /* d_costheta */ - tmp=1.0/dd; - d_costheta1=cos_theta/d_ij2-tmp; - d_costheta2=cos_theta/d_ik2-tmp; - - /* some usefull values */ - h_cos=(h-cos_theta); - d2_h_cos2=d2+(h_cos*h_cos); - frac=c2/(d2_h_cos2); - - /* g(cos_theta) */ - g=1.0+c2d2-frac; - - /* d_costheta_ij and dg(cos_theta) - needed in any case! */ - v3_scale(&temp1,&dist_ij,d_costheta1); - v3_scale(&temp2,&dist_ik,d_costheta2); - v3_add(&temp1,&temp1,&temp2); - v3_scale(&temp1,&temp1,-2.0*frac*h_cos/d2_h_cos2); /* dg */ - - /* f_c_ik & df_c_ik + {d,}zeta contribution */ - dzeta=&(exchange->dzeta_ij); - if(d_ik f_c_ik=1.0; - // => df_c_ik=0.0; of course we do not set this! - - /* zeta_ij */ - exchange->zeta_ij+=g; - - /* dzeta_ij */ - v3_add(dzeta,dzeta,&temp1); - } - else { - /* {d,}f_c_ik */ - s_r=S-R; - arg=M_PI*(d_ik-R)/s_r; - f_c_ik=0.5+0.5*cos(arg); - df_c_ik=0.5*sin(arg)*(M_PI/(s_r*d_ik)); - - /* zeta_ij */ - exchange->zeta_ij+=f_c_ik*g; - - /* dzeta_ij */ - v3_scale(&temp1,&temp1,f_c_ik); - v3_scale(&temp2,&dist_ik,g*df_c_ik); - v3_add(&temp1,&temp1,&temp2); - v3_add(dzeta,dzeta,&temp1); - } - } - - /* dV_ji stuff (in b_ji there is f_c_jk) + dV_jk stuff! */ - - /* dist_jk, d_jk */ - v3_sub(&dist_jk,&(ak->r),&(aj->r)); - if(bc) check_per_bound(moldyn,&dist_jk); - d_jk2=v3_absolute_square(&dist_jk); - - /* jk constants */ - brand=aj->brand; - if(brand==ak->brand) { - R=params->R[brand]; - S=params->S[brand]; - S2=params->S2[brand]; - B=params->B[brand]; - mu=params->mu[brand]; - chi=1.0; - } - else { - R=params->Rmixed; - S=params->Smixed; - S2=params->S2mixed; - B=params->Bmixed; - mu=params->mu_m; - chi=params->chi; - } - - /* zeta_ji/dzeta_ji contribution only for d_jk < S_jk */ - if(d_jk2n_j); - c=*(exchange->c_j); - d=*(exchange->d_j); - h=*(exchange->h_j); - c2=exchange->cj2; - d2=exchange->dj2; - c2d2=exchange->cj2dj2; - - /* cosine of theta_jik by scalaproduct */ - rr=-v3_scalar_product(&dist_ij,&dist_jk); /* -1, as ij -> ji */ - dd=d_ij*d_jk; - cos_theta=rr/dd; - - /* d_costheta */ - d_costheta1=1.0/dd; - d_costheta2=cos_theta/d_ij2; - - /* some usefull values */ - h_cos=(h-cos_theta); - d2_h_cos2=d2+(h_cos*h_cos); - frac=c2/(d2_h_cos2); - - /* g(cos_theta) */ - g=1.0+c2d2-frac; - - /* d_costheta_jik and dg(cos_theta) - needed in any case! */ - v3_scale(&temp1,&dist_jk,d_costheta1); - v3_scale(&temp2,&dist_ij,-d_costheta2); /* ji -> ij => -1 */ - //v3_add(&temp1,&temp1,&temp2); - v3_sub(&temp1,&temp1,&temp2); /* there is a minus! */ - v3_scale(&temp1,&temp1,-2.0*frac*h_cos/d2_h_cos2); /* dg */ - - /* store dg in temp2 and use it for dVjk later */ - v3_copy(&temp2,&temp1); - - /* f_c_jk + {d,}zeta contribution (df_c_jk = 0) */ - dzeta=&(exchange->dzeta_ji); - if(d_jkzeta_ji+=g; - - /* dzeta_ji */ - v3_add(dzeta,dzeta,&temp1); - } - else { - /* f_c_jk */ - s_r=S-R; - arg=M_PI*(d_jk-R)/s_r; - f_c_jk=0.5+0.5*cos(arg); - - /* zeta_ji */ - exchange->zeta_ji+=f_c_jk*g; - - /* dzeta_ji */ - v3_scale(&temp1,&temp1,f_c_jk); - v3_add(dzeta,dzeta,&temp1); - } - - /* dV_jk stuff | add force contribution on atom i immediately */ - if(exchange->d_ij_between_rs) { - zeta=f_c*g; - v3_scale(&temp1,&temp2,f_c); - v3_scale(&temp2,&dist_ij,df_c*g); - v3_add(&temp2,&temp2,&temp1); /* -> dzeta_jk in temp2 */ - } - else { - zeta=g; - // dzeta_jk is simply dg, which is stored in temp2 - } - /* betajnj * zeta_jk ^ nj-1 */ - tmp=exchange->betajnj*pow(zeta,(n-1.0)); - tmp=-chi/2.0*pow((1+tmp*zeta),(-1.0/(2.0*n)-1))*tmp; - v3_scale(&temp2,&temp2,tmp*B*exp(-mu*d_jk)*f_c_jk*0.5); - v3_add(&(ai->f),&(ai->f),&temp2); /* -1 skipped in f_a calc ^ */ - /* scaled with 0.5 ^ */ - - /* virial */ - ai->virial.xx-=temp2.x*dist_jk.x; - ai->virial.yy-=temp2.y*dist_jk.y; - ai->virial.zz-=temp2.z*dist_jk.z; - ai->virial.xy-=temp2.x*dist_jk.y; - ai->virial.xz-=temp2.x*dist_jk.z; - ai->virial.yz-=temp2.y*dist_jk.z; - -#ifdef DEBUG -if(ai==&(moldyn->atom[0])) { - printf("dVjk (3bp) contrib:\n"); - printf("%f | %f\n",temp2.x,ai->f.x); - printf("%f | %f\n",temp2.y,ai->f.y); - printf("%f | %f\n",temp2.z,ai->f.z); -} -#endif -#ifdef VDEBUG -if(ai==&(moldyn->atom[0])) { - printf("dVjk (3bp) contrib:\n"); - printf("%f | %f\n",temp2.x*dist_jk.x,ai->virial.xx); - printf("%f | %f\n",temp2.y*dist_jk.y,ai->virial.yy); - printf("%f | %f\n",temp2.z*dist_jk.z,ai->virial.zz); -} -#endif - - } - - return 0; -} - - /* * debugging / critical check functions */