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Comparing trunk/OOPSE/libmdtools/NPTi.cpp (file contents):
Revision 767 by tim, Tue Sep 16 20:02:11 2003 UTC vs.
Revision 853 by mmeineke, Thu Nov 6 19:11:38 2003 UTC

# Line 1 | Line 1
1 < #include <cmath>
1 > #include <math.h>
2   #include "Atom.hpp"
3   #include "SRI.hpp"
4   #include "AbstractClasses.hpp"
# Line 7 | Line 7
7   #include "Thermo.hpp"
8   #include "ReadWrite.hpp"
9   #include "Integrator.hpp"
10 < #include "simError.h"
10 > #include "simError.h"
11  
12   #ifdef IS_MPI
13   #include "mpiSimulation.hpp"
14   #endif
15  
16 –
16   // Basic isotropic thermostating and barostating via the Melchionna
17   // modification of the Hoover algorithm:
18   //
19   //    Melchionna, S., Ciccotti, G., and Holian, B. L., 1993,
20 < //       Molec. Phys., 78, 533.
20 > //       Molec. Phys., 78, 533.
21   //
22   //           and
23 < //
23 > //
24   //    Hoover, W. G., 1986, Phys. Rev. A, 34, 2499.
25  
26   template<typename T> NPTi<T>::NPTi ( SimInfo *theInfo, ForceFields* the_ff):
27    T( theInfo, the_ff )
28   {
29 <  chi = 0.0;
29 >  GenericData* data;
30 >  DoubleArrayData * etaValue;
31 >  vector<double> etaArray;
32 >
33    eta = 0.0;
34 <  integralOfChidt = 0.0;
33 <  have_tau_thermostat = 0;
34 <  have_tau_barostat = 0;
35 <  have_target_temp = 0;
36 <  have_target_pressure = 0;
37 <  have_chi_tolerance = 0;
38 <  have_eta_tolerance = 0;
39 <  have_pos_iter_tolerance = 0;
34 >  oldEta = 0.0;
35  
36 <  oldPos = new double[3*nAtoms];
37 <  oldVel = new double[3*nAtoms];
38 <  oldJi = new double[3*nAtoms];
39 < #ifdef IS_MPI
45 <  Nparticles = mpiSim->getTotAtoms();
46 < #else
47 <  Nparticles = theInfo->n_atoms;
48 < #endif
36 >  // retrieve eta from simInfo if
37 >  data = info->getProperty(ETAVALUE_ID);
38 >  if(data){
39 >    etaValue = dynamic_cast<DoubleArrayData*>(data);
40  
41 +    if(etaValue){
42 +      etaArray = etaValue->getData();
43 +      eta = etaArray[0];
44 +      oldEta = eta;
45 +    }
46 +  }
47 +
48   }
49  
50   template<typename T> NPTi<T>::~NPTi() {
51 <  delete[] oldPos;
54 <  delete[] oldVel;
55 <  delete[] oldJi;
51 >  //nothing for now
52   }
53  
54 < template<typename T> void NPTi<T>::moveA() {
55 <
56 <  //new version of NPTi
57 <  int i, j, k;
62 <  DirectionalAtom* dAtom;
63 <  double Tb[3], ji[3];
64 <  double A[3][3], I[3][3];
65 <  double angle, mass;
66 <  double vel[3], pos[3], frc[3];
54 > template<typename T> void NPTi<T>::resetIntegrator() {
55 >  eta = 0.0;
56 >  T::resetIntegrator();
57 > }
58  
59 <  double rj[3];
60 <  double instaTemp, instaPress, instaVol;
61 <  double tt2, tb2, scaleFactor;
62 <  double COM[3];
59 > template<typename T> void NPTi<T>::evolveEtaA() {
60 >  eta += dt2 * ( instaVol * (instaPress - targetPressure) /
61 >                 (p_convert*NkBT*tb2));
62 >  oldEta = eta;
63 > }
64  
65 <  tt2 = tauThermostat * tauThermostat;
74 <  tb2 = tauBarostat * tauBarostat;
65 > template<typename T> void NPTi<T>::evolveEtaB() {
66  
67 <  instaTemp = tStats->getTemperature();
68 <  instaPress = tStats->getPressure();
69 <  instaVol = tStats->getVolume();
70 <  
80 <  tStats->getCOM(COM);
81 <  
82 <  //evolve velocity half step
83 <  for( i=0; i<nAtoms; i++ ){
67 >  prevEta = eta;
68 >  eta = oldEta + dt2 * ( instaVol * (instaPress - targetPressure) /
69 >                 (p_convert*NkBT*tb2));
70 > }
71  
72 <    atoms[i]->getVel( vel );
73 <    atoms[i]->getFrc( frc );
72 > template<typename T> void NPTi<T>::getVelScaleA(double sc[3], double vel[3]) {
73 >  int i;
74  
75 <    mass = atoms[i]->getMass();
75 >  for(i=0; i<3; i++) sc[i] = vel[i] * ( chi + eta );
76 > }
77  
78 <    for (j=0; j < 3; j++) {
79 <      // velocity half step  (use chi from previous step here):
92 <      vel[j] += dt2 * ((frc[j] / mass ) * eConvert - vel[j]*(chi + eta));
93 <  
94 <    }
78 > template<typename T> void NPTi<T>::getVelScaleB(double sc[3], int index ){
79 >  int i;
80  
81 <    atoms[i]->setVel( vel );
82 <  
98 <    if( atoms[i]->isDirectional() ){
81 >  for(i=0; i<3; i++) sc[i] = oldVel[index*3 + i] * ( chi + eta );
82 > }
83  
100 –      dAtom = (DirectionalAtom *)atoms[i];
84  
85 <      // get and convert the torque to body frame
86 <      
87 <      dAtom->getTrq( Tb );
105 <      dAtom->lab2Body( Tb );
106 <      
107 <      // get the angular momentum, and propagate a half step
85 > template<typename T> void NPTi<T>::getPosScale(double pos[3], double COM[3],
86 >                                               int index, double sc[3]){
87 >  int j;
88  
89 <      dAtom->getJ( ji );
89 >  for(j=0; j<3; j++)
90 >    sc[j] = ( oldPos[index*3+j] + pos[j]) / 2.0 - COM[j];
91  
92 <      for (j=0; j < 3; j++)
93 <        ji[j] += dt2 * (Tb[j] * eConvert - ji[j]*chi);
94 <      
114 <      // use the angular velocities to propagate the rotation matrix a
115 <      // full time step
92 >  for(j=0; j<3; j++)
93 >    sc[j] *= eta;
94 > }
95  
96 <      dAtom->getA(A);
118 <      dAtom->getI(I);
119 <    
120 <      // rotate about the x-axis      
121 <      angle = dt2 * ji[0] / I[0][0];
122 <      this->rotate( 1, 2, angle, ji, A );
96 > template<typename T> void NPTi<T>::scaleSimBox( void ){
97  
98 <      // rotate about the y-axis
125 <      angle = dt2 * ji[1] / I[1][1];
126 <      this->rotate( 2, 0, angle, ji, A );
127 <      
128 <      // rotate about the z-axis
129 <      angle = dt * ji[2] / I[2][2];
130 <      this->rotate( 0, 1, angle, ji, A);
131 <      
132 <      // rotate about the y-axis
133 <      angle = dt2 * ji[1] / I[1][1];
134 <      this->rotate( 2, 0, angle, ji, A );
135 <      
136 <       // rotate about the x-axis
137 <      angle = dt2 * ji[0] / I[0][0];
138 <      this->rotate( 1, 2, angle, ji, A );
139 <      
140 <      dAtom->setJ( ji );
141 <      dAtom->setA( A  );    
142 <    }    
143 <  }
98 >  double scaleFactor;
99  
145 –  // evolve chi and eta  half step
146 –  
147 –  chi += dt2 * ( instaTemp / targetTemp - 1.0) / tt2;
148 –  eta += dt2 * ( instaVol * (instaPress - targetPressure) / (p_convert*NkBT*tb2));
149 –
150 –  //calculate the integral of chidt
151 –  integralOfChidt += dt2*chi;
152 –
153 –  //save the old positions
154 –  for(i = 0; i < nAtoms; i++){
155 –    atoms[i]->getPos(pos);
156 –    for(j = 0; j < 3; j++)
157 –      oldPos[i*3 + j] = pos[j];
158 –  }
159 –  
160 –  //the first estimation of r(t+dt) is equal to  r(t)
161 –    
162 –  for(k = 0; k < 4; k ++){
163 –
164 –    for(i =0 ; i < nAtoms; i++){
165 –
166 –      atoms[i]->getVel(vel);
167 –      atoms[i]->getPos(pos);
168 –
169 –      for(j = 0; j < 3; j++)
170 –        rj[j] = (oldPos[i*3 + j] + pos[j])/2 - COM[j];    
171 –      
172 –      for(j = 0; j < 3; j++)
173 –        pos[j] = oldPos[i*3 + j] + dt*(vel[j] + eta*rj[j]);
174 –
175 –      atoms[i]->setPos( pos );
176 –
177 –    }
178 –
179 –  }
180 –    
181 –
182 –  // Scale the box after all the positions have been moved:
183 –  
100    scaleFactor = exp(dt*eta);
101  
102    if ((scaleFactor > 1.1) || (scaleFactor < 0.9)) {
# Line 191 | Line 107 | template<typename T> void NPTi<T>::moveA() {
107               );
108      painCave.isFatal = 1;
109      simError();
110 <  } else {        
111 <    info->scaleBox(scaleFactor);      
112 <  }  
110 >  } else {
111 >    info->scaleBox(scaleFactor);
112 >  }
113  
114   }
115  
116 < template<typename T> void NPTi<T>::moveB( void ){
201 <  
202 <  //new version of NPTi
203 <  int i, j, k;
204 <  DirectionalAtom* dAtom;
205 <  double Tb[3], ji[3];
206 <  double vel[3], frc[3];
207 <  double mass;
116 > template<typename T> bool NPTi<T>::etaConverged() {
117  
118 <  double instTemp, instPress, instVol;
119 <  double tt2, tb2;
211 <  double oldChi, prevChi;
212 <  double oldEta, preEta;
213 <  
214 <  tt2 = tauThermostat * tauThermostat;
215 <  tb2 = tauBarostat * tauBarostat;
118 >  return ( fabs(prevEta - eta) <= etaTolerance );
119 > }
120  
121 + template<typename T> double NPTi<T>::getConservedQuantity(void){
122  
123 <  // Set things up for the iteration:
123 >  double conservedQuantity;
124 >  double Energy;
125 >  double thermostat_kinetic;
126 >  double thermostat_potential;
127 >  double barostat_kinetic;
128 >  double barostat_potential;
129  
130 <  oldChi = chi;
221 <  oldEta = eta;
222 <
223 <  for( i=0; i<nAtoms; i++ ){
130 >  Energy = tStats->getTotalE();
131  
132 <    atoms[i]->getVel( vel );
132 >  thermostat_kinetic = fkBT* tt2 * chi * chi /
133 >    (2.0 * eConvert);
134  
135 <    for (j=0; j < 3; j++)
228 <      oldVel[3*i + j]  = vel[j];
135 >  thermostat_potential = fkBT* integralOfChidt / eConvert;
136  
230 –    if( atoms[i]->isDirectional() ){
137  
138 <      dAtom = (DirectionalAtom *)atoms[i];
138 >  barostat_kinetic = 3.0 * NkBT * tb2 * eta * eta /
139 >    (2.0 * eConvert);
140  
141 <      dAtom->getJ( ji );
141 >  barostat_potential = (targetPressure * tStats->getVolume() / p_convert) /
142 >    eConvert;
143  
144 <      for (j=0; j < 3; j++)
145 <        oldJi[3*i + j] = ji[j];
144 >  conservedQuantity = Energy + thermostat_kinetic + thermostat_potential +
145 >    barostat_kinetic + barostat_potential;
146  
147 <    }
148 <  }
147 > //   cout.width(8);
148 > //   cout.precision(8);
149  
150 <  // do the iteration:
151 <
152 <  instVol = tStats->getVolume();
153 <  
246 <  for (k=0; k < 4; k++) {
247 <    
248 <    instTemp = tStats->getTemperature();
249 <    instPress = tStats->getPressure();
250 <
251 <    // evolve chi another half step using the temperature at t + dt/2
252 <
253 <    prevChi = chi;
254 <    chi = oldChi + dt2 * ( instTemp / targetTemp - 1.0) /
255 <      (tauThermostat*tauThermostat);
256 <
257 <    preEta = eta;
258 <    eta = oldEta + dt2 * ( instVol * (instPress - targetPressure) /
259 <       (p_convert*NkBT*tb2));
260 <
261 <  
262 <    for( i=0; i<nAtoms; i++ ){
263 <
264 <      atoms[i]->getFrc( frc );
265 <      atoms[i]->getVel(vel);
266 <      
267 <      mass = atoms[i]->getMass();
268 <      
269 <      // velocity half step
270 <      for (j=0; j < 3; j++)
271 <        vel[j] = oldVel[3*i+j] + dt2 * ((frc[j] / mass ) * eConvert - oldVel[3*i + j]*(chi + eta));
272 <      
273 <      atoms[i]->setVel( vel );
274 <      
275 <      if( atoms[i]->isDirectional() ){
276 <
277 <        dAtom = (DirectionalAtom *)atoms[i];
278 <  
279 <        // get and convert the torque to body frame      
280 <  
281 <        dAtom->getTrq( Tb );
282 <        dAtom->lab2Body( Tb );      
283 <            
284 <        for (j=0; j < 3; j++)
285 <          ji[j] = oldJi[3*i + j] + dt2 * (Tb[j] * eConvert - oldJi[3*i+j]*chi);
286 <      
287 <          dAtom->setJ( ji );
288 <      }
289 <    }
290 <
291 <    if (fabs(prevChi - chi) <= chiTolerance && fabs(preEta -eta) <= etaTolerance)
292 <      break;
293 <  }
294 <
295 <  //calculate integral of chida
296 <  integralOfChidt += dt2*chi;
297 <
298 <
150 > //   cerr << info->getTime() << "\t" << Energy << "\t" << thermostat_kinetic <<
151 > //       "\t" << thermostat_potential << "\t" << barostat_kinetic <<
152 > //       "\t" << barostat_potential << "\t" << conservedQuantity << endl;
153 >  return conservedQuantity;
154   }
155  
156 < template<typename T> void NPTi<T>::resetIntegrator() {
157 <  chi = 0.0;
158 <  eta = 0.0;
159 < }
156 > template<typename T> string NPTi<T>::getAdditionalParameters(void){
157 >  string parameters;
158 >  const int BUFFERSIZE = 2000; // size of the read buffer
159 >  char buffer[BUFFERSIZE];
160  
161 < template<typename T> int NPTi<T>::readyCheck() {
161 >  sprintf(buffer,"\t%G\t%G;", chi, integralOfChidt);
162 >  parameters += buffer;
163  
164 <  //check parent's readyCheck() first
165 <  if (T::readyCheck() == -1)
310 <    return -1;
311 <
312 <  // First check to see if we have a target temperature.
313 <  // Not having one is fatal.
314 <  
315 <  if (!have_target_temp) {
316 <    sprintf( painCave.errMsg,
317 <             "NPTi error: You can't use the NPTi integrator\n"
318 <             "   without a targetTemp!\n"
319 <             );
320 <    painCave.isFatal = 1;
321 <    simError();
322 <    return -1;
323 <  }
164 >  sprintf(buffer,"\t%G\t0\t0;", eta);
165 >  parameters += buffer;
166  
167 <  if (!have_target_pressure) {
168 <    sprintf( painCave.errMsg,
327 <             "NPTi error: You can't use the NPTi integrator\n"
328 <             "   without a targetPressure!\n"
329 <             );
330 <    painCave.isFatal = 1;
331 <    simError();
332 <    return -1;
333 <  }
334 <  
335 <  // We must set tauThermostat.
336 <  
337 <  if (!have_tau_thermostat) {
338 <    sprintf( painCave.errMsg,
339 <             "NPTi error: If you use the NPTi\n"
340 <             "   integrator, you must set tauThermostat.\n");
341 <    painCave.isFatal = 1;
342 <    simError();
343 <    return -1;
344 <  }    
167 >  sprintf(buffer,"\t0\t%G\t0;", eta);
168 >  parameters += buffer;
169  
170 <  // We must set tauBarostat.
171 <  
348 <  if (!have_tau_barostat) {
349 <    sprintf( painCave.errMsg,
350 <             "NPTi error: If you use the NPTi\n"
351 <             "   integrator, you must set tauBarostat.\n");
352 <    painCave.isFatal = 1;
353 <    simError();
354 <    return -1;
355 <  }    
170 >  sprintf(buffer,"\t0\t0\t%G;", eta);
171 >  parameters += buffer;
172  
173 <  if (!have_chi_tolerance) {
358 <    sprintf( painCave.errMsg,
359 <             "NPTi warning: setting chi tolerance to 1e-6\n");
360 <    chiTolerance = 1e-6;
361 <    have_chi_tolerance = 1;
362 <    painCave.isFatal = 0;
363 <    simError();
364 <  }
173 >  return parameters;
174  
366 –    if (!have_eta_tolerance) {
367 –    sprintf( painCave.errMsg,
368 –             "NPTi warning: setting eta tolerance to 1e-6\n");
369 –    etaTolerance = 1e-6;
370 –    have_eta_tolerance = 1;
371 –    painCave.isFatal = 0;
372 –    simError();
373 –  }
374 –  // We need NkBT a lot, so just set it here:
375 –
376 –  NkBT = (double)Nparticles * kB * targetTemp;
377 –  fkBT = (double)info->ndf * kB * targetTemp;
378 –
379 –  return 1;
175   }
381 –
382 – template<typename T> double NPTi<T>::getConservedQuantity(void){
383 –
384 –  double conservedQuantity;
385 –  double tb2;
386 –  double eta2;  
387 –  double E_NPT;
388 –  double U;
389 –  double TS;
390 –  double PV;
391 –  double extra;
392 –
393 –  U = tStats->getTotalE();
394 –
395 –  TS = fkBT *
396 –    (integralOfChidt + tauThermostat * tauThermostat * chi * chi / 2.0) / eConvert;
397 –
398 –  PV = (targetPressure * tStats->getVolume() / p_convert) / eConvert;
399 –
400 –  tb2 = tauBarostat * tauBarostat;
401 –  eta2 = eta * eta;
402 –
403 –
404 –  extra = ((double)info->ndfTrans * kB * targetTemp * tb2 * eta2 / 2.0) / eConvert;
405 –
406 –  cout.width(8);
407 –  cout.precision(8);
408 –
409 –  
410 –  cout << info->getTime() << "\t"
411 –       << chi << "\t"
412 –       << eta << "\t"
413 –       << U << "\t"
414 –       << TS << "\t"
415 –       << PV << "\t"
416 –       << extra << "\t"
417 –       << U+TS+PV+extra << endl;
418 –
419 –  conservedQuantity = U+TS+PV+extra;
420 –  return conservedQuantity;
421 – }

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