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root/group/trunk/OOPSE/libmdtools/NPTf.cpp
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Comparing trunk/OOPSE/libmdtools/NPTf.cpp (file contents):
Revision 600 by gezelter, Mon Jul 14 22:38:13 2003 UTC vs.
Revision 853 by mmeineke, Thu Nov 6 19:11:38 2003 UTC

# Line 1 | Line 1
1 + #include <math.h>
2   #include "Atom.hpp"
3   #include "SRI.hpp"
4   #include "AbstractClasses.hpp"
# Line 6 | 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   // Basic non-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 < NPTf::NPTf ( SimInfo *theInfo, ForceFields* the_ff):
27 <  Integrator( theInfo, the_ff )
26 > template<typename T> NPTf<T>::NPTf ( SimInfo *theInfo, ForceFields* the_ff):
27 >  T( theInfo, the_ff )
28   {
29 +  GenericData* data;
30 +  DoubleArrayData * etaValue;
31 +  vector<double> etaArray;
32 +  int i,j;
33 +
34 +  for(i = 0; i < 3; i++){
35 +    for (j = 0; j < 3; j++){
36 +
37 +      eta[i][j] = 0.0;
38 +      oldEta[i][j] = 0.0;
39 +    }
40 +  }
41 +
42 +    // retrieve eta array from simInfo if it exists
43 +    data = info->getProperty(ETAVALUE_ID);
44 +    if(data){
45 +      etaValue = dynamic_cast<DoubleArrayData*>(data);
46 +
47 +      if(etaValue){
48 +        etaArray = etaValue->getData();
49 +
50 +        for(i = 0; i < 3; i++){
51 +          for (j = 0; j < 3; j++){
52 +            eta[i][j] = etaArray[3*i+j];
53 +            oldEta[i][j] = eta[i][j];
54 +          }
55 +        }
56 +
57 +      }
58 +    }
59 +
60 + }
61 +
62 + template<typename T> NPTf<T>::~NPTf() {
63 +
64 +  // empty for now
65 + }
66 +
67 + template<typename T> void NPTf<T>::resetIntegrator() {
68 +
69    int i, j;
26 –  chi = 0.0;
70  
71 <  for(i = 0; i < 3; i++)
72 <    for (j = 0; j < 3; j++)
71 >  for(i = 0; i < 3; i++)
72 >    for (j = 0; j < 3; j++)
73        eta[i][j] = 0.0;
74  
75 <  have_tau_thermostat = 0;
33 <  have_tau_barostat = 0;
34 <  have_target_temp = 0;
35 <  have_target_pressure = 0;
75 >  T::resetIntegrator();
76   }
77  
78 < void NPTf::moveA() {
39 <  
40 <  int i, j, k;
41 <  DirectionalAtom* dAtom;
42 <  double Tb[3], ji[3];
43 <  double A[3][3], I[3][3];
44 <  double angle, mass;
45 <  double vel[3], pos[3], frc[3];
78 > template<typename T> void NPTf<T>::evolveEtaA() {
79  
80 <  double rj[3];
48 <  double instaTemp, instaPress, instaVol;
49 <  double tt2, tb2;
50 <  double sc[3];
51 <  double eta2ij;
52 <  double press[3][3], vScale[3][3], hm[3][3], hmnew[3][3], scaleMat[3][3];
80 >  int i, j;
81  
82 <  tt2 = tauThermostat * tauThermostat;
83 <  tb2 = tauBarostat * tauBarostat;
82 >  for(i = 0; i < 3; i ++){
83 >    for(j = 0; j < 3; j++){
84 >      if( i == j)
85 >        eta[i][j] += dt2 *  instaVol *
86 >          (press[i][j] - targetPressure/p_convert) / (NkBT*tb2);
87 >      else
88 >        eta[i][j] += dt2 * instaVol * press[i][j] / (NkBT*tb2);
89 >    }
90 >  }
91  
92 <  instaTemp = tStats->getTemperature();
93 <  tStats->getPressureTensor(press);
94 <  instaVol = tStats->getVolume();
95 <  
61 <  // first evolve chi a half step
62 <  
63 <  chi += dt2 * ( instaTemp / targetTemp - 1.0) / tt2;
92 >  for(i = 0; i < 3; i++)
93 >    for (j = 0; j < 3; j++)
94 >      oldEta[i][j] = eta[i][j];
95 > }
96  
97 + template<typename T> void NPTf<T>::evolveEtaB() {
98 +
99 +  int i,j;
100 +
101 +  for(i = 0; i < 3; i++)
102 +    for (j = 0; j < 3; j++)
103 +      prevEta[i][j] = eta[i][j];
104 +
105 +  for(i = 0; i < 3; i ++){
106 +    for(j = 0; j < 3; j++){
107 +      if( i == j) {
108 +        eta[i][j] = oldEta[i][j] + dt2 *  instaVol *
109 +          (press[i][j] - targetPressure/p_convert) / (NkBT*tb2);
110 +      } else {
111 +        eta[i][j] = oldEta[i][j] + dt2 * instaVol * press[i][j] / (NkBT*tb2);
112 +      }
113 +    }
114 +  }
115 + }
116 +
117 + template<typename T> void NPTf<T>::getVelScaleA(double sc[3], double vel[3]) {
118 +  int i,j;
119 +  double vScale[3][3];
120 +
121    for (i = 0; i < 3; i++ ) {
122      for (j = 0; j < 3; j++ ) {
123 <      if (i == j) {
68 <        
69 <        eta[i][j] += dt2 * instaVol *
70 <          (press[i][j] - targetPressure/p_convert) / (NkBT*tb2);
71 <        
72 <        vScale[i][j] = eta[i][j] + chi;
73 <        
74 <      } else {
75 <        
76 <        eta[i][j] += dt2 * instaVol * press[i][j] / (NkBT*tb2);
123 >      vScale[i][j] = eta[i][j];
124  
125 <        vScale[i][j] = eta[i][j];
126 <        
125 >      if (i == j) {
126 >        vScale[i][j] += chi;
127        }
128      }
129    }
130  
131 <  for( i=0; i<nAtoms; i++ ){
131 >  info->matVecMul3( vScale, vel, sc );
132 > }
133  
134 <    atoms[i]->getVel( vel );
135 <    atoms[i]->getPos( pos );
136 <    atoms[i]->getFrc( frc );
134 > template<typename T> void NPTf<T>::getVelScaleB(double sc[3], int index ){
135 >  int i,j;
136 >  double myVel[3];
137 >  double vScale[3][3];
138  
139 <    mass = atoms[i]->getMass();
140 <    
141 <    // velocity half step
142 <        
143 <    info->matVecMul3( vScale, vel, sc );
144 <    
145 <    for (j = 0; j < 3; j++) {
97 <      vel[j] += dt2 * ((frc[j]  / mass) * eConvert - sc[j]);
98 <      rj[j] = pos[j];
139 >  for (i = 0; i < 3; i++ ) {
140 >    for (j = 0; j < 3; j++ ) {
141 >      vScale[i][j] = eta[i][j];
142 >
143 >      if (i == j) {
144 >        vScale[i][j] += chi;
145 >      }
146      }
147 +  }
148  
149 <    atoms[i]->setVel( vel );
149 >  for (j = 0; j < 3; j++)
150 >    myVel[j] = oldVel[3*index + j];
151  
152 <    // position whole step    
152 >  info->matVecMul3( vScale, myVel, sc );
153 > }
154  
155 <    info->wrapVector(rj);
155 > template<typename T> void NPTf<T>::getPosScale(double pos[3], double COM[3],
156 >                                               int index, double sc[3]){
157 >  int j;
158 >  double rj[3];
159  
160 <    info->matVecMul3( eta, rj, sc );
160 >  for(j=0; j<3; j++)
161 >    rj[j] = ( oldPos[index*3+j] + pos[j]) / 2.0 - COM[j];
162  
163 <    for (j = 0; j < 3; j++ )
164 <      pos[j] += dt * (vel[j] + sc[j]);
111 <  
112 <    if( atoms[i]->isDirectional() ){
163 >  info->matVecMul3( eta, rj, sc );
164 > }
165  
166 <      dAtom = (DirectionalAtom *)atoms[i];
115 <          
116 <      // get and convert the torque to body frame
117 <      
118 <      dAtom->getTrq( Tb );
119 <      dAtom->lab2Body( Tb );
120 <      
121 <      // get the angular momentum, and propagate a half step
166 > template<typename T> void NPTf<T>::scaleSimBox( void ){
167  
168 <      dAtom->getJ( ji );
168 >  int i,j,k;
169 >  double scaleMat[3][3];
170 >  double eta2ij;
171 >  double bigScale, smallScale, offDiagMax;
172 >  double hm[3][3], hmnew[3][3];
173  
125 –      for (j=0; j < 3; j++)
126 –        ji[j] += dt2 * (Tb[j] * eConvert - ji[j]*chi);
127 –      
128 –      // use the angular velocities to propagate the rotation matrix a
129 –      // full time step
174  
131 –      dAtom->getA(A);
132 –      dAtom->getI(I);
133 –    
134 –      // rotate about the x-axis      
135 –      angle = dt2 * ji[0] / I[0][0];
136 –      this->rotate( 1, 2, angle, ji, A );
175  
138 –      // rotate about the y-axis
139 –      angle = dt2 * ji[1] / I[1][1];
140 –      this->rotate( 2, 0, angle, ji, A );
141 –      
142 –      // rotate about the z-axis
143 –      angle = dt * ji[2] / I[2][2];
144 –      this->rotate( 0, 1, angle, ji, A);
145 –      
146 –      // rotate about the y-axis
147 –      angle = dt2 * ji[1] / I[1][1];
148 –      this->rotate( 2, 0, angle, ji, A );
149 –      
150 –       // rotate about the x-axis
151 –      angle = dt2 * ji[0] / I[0][0];
152 –      this->rotate( 1, 2, angle, ji, A );
153 –      
154 –      dAtom->setJ( ji );
155 –      dAtom->setA( A  );    
156 –    }                    
157 –  }
158 –  
176    // Scale the box after all the positions have been moved:
177 <  
177 >
178    // Use a taylor expansion for eta products:  Hmat = Hmat . exp(dt * etaMat)
179    //  Hmat = Hmat . ( Ident + dt * etaMat  + dt^2 * etaMat*etaMat / 2)
180 <  
181 <  
180 >
181 >  bigScale = 1.0;
182 >  smallScale = 1.0;
183 >  offDiagMax = 0.0;
184 >
185    for(i=0; i<3; i++){
186      for(j=0; j<3; j++){
187 <      
187 >
188        // Calculate the matrix Product of the eta array (we only need
189        // the ij element right now):
190 <      
190 >
191        eta2ij = 0.0;
192        for(k=0; k<3; k++){
193          eta2ij += eta[i][k] * eta[k][j];
194        }
195 <      
195 >
196        scaleMat[i][j] = 0.0;
197        // identity matrix (see above):
198        if (i == j) scaleMat[i][j] = 1.0;
199        // Taylor expansion for the exponential truncated at second order:
200        scaleMat[i][j] += dt*eta[i][j]  + 0.5*dt*dt*eta2ij;
201 <      
201 >
202 >      if (i != j)
203 >        if (fabs(scaleMat[i][j]) > offDiagMax)
204 >          offDiagMax = fabs(scaleMat[i][j]);
205      }
206 +
207 +    if (scaleMat[i][i] > bigScale) bigScale = scaleMat[i][i];
208 +    if (scaleMat[i][i] < smallScale) smallScale = scaleMat[i][i];
209    }
210 <  
211 <  info->getBoxM(hm);
212 <  info->matMul3(hm, scaleMat, hmnew);
213 <  info->setBoxM(hmnew);
214 <  
210 >
211 >  if ((bigScale > 1.01) || (smallScale < 0.99)) {
212 >    sprintf( painCave.errMsg,
213 >             "NPTf error: Attempting a Box scaling of more than 1 percent.\n"
214 >             " Check your tauBarostat, as it is probably too small!\n\n"
215 >             " scaleMat = [%lf\t%lf\t%lf]\n"
216 >             "            [%lf\t%lf\t%lf]\n"
217 >             "            [%lf\t%lf\t%lf]\n",
218 >             scaleMat[0][0],scaleMat[0][1],scaleMat[0][2],
219 >             scaleMat[1][0],scaleMat[1][1],scaleMat[1][2],
220 >             scaleMat[2][0],scaleMat[2][1],scaleMat[2][2]);
221 >    painCave.isFatal = 1;
222 >    simError();
223 >  } else if (offDiagMax > 0.01) {
224 >    sprintf( painCave.errMsg,
225 >             "NPTf error: Attempting an off-diagonal Box scaling of more than 1 percent.\n"
226 >             " Check your tauBarostat, as it is probably too small!\n\n"
227 >             " scaleMat = [%lf\t%lf\t%lf]\n"
228 >             "            [%lf\t%lf\t%lf]\n"
229 >             "            [%lf\t%lf\t%lf]\n",
230 >             scaleMat[0][0],scaleMat[0][1],scaleMat[0][2],
231 >             scaleMat[1][0],scaleMat[1][1],scaleMat[1][2],
232 >             scaleMat[2][0],scaleMat[2][1],scaleMat[2][2]);
233 >    painCave.isFatal = 1;
234 >    simError();
235 >  } else {
236 >    info->getBoxM(hm);
237 >    info->matMul3(hm, scaleMat, hmnew);
238 >    info->setBoxM(hmnew);
239 >  }
240   }
241  
242 < void NPTf::moveB( void ){
242 > template<typename T> bool NPTf<T>::etaConverged() {
243 >  int i;
244 >  double diffEta, sumEta;
245  
246 <  int i, j;
247 <  DirectionalAtom* dAtom;
248 <  double Tb[3], ji[3];
196 <  double vel[3], frc[3];
197 <  double mass;
246 >  sumEta = 0;
247 >  for(i = 0; i < 3; i++)
248 >    sumEta += pow(prevEta[i][i] - eta[i][i], 2);
249  
250 <  double instaTemp, instaPress, instaVol;
200 <  double tt2, tb2;
201 <  double sc[3];
202 <  double press[3][3], vScale[3][3];
203 <  
204 <  tt2 = tauThermostat * tauThermostat;
205 <  tb2 = tauBarostat * tauBarostat;
250 >  diffEta = sqrt( sumEta / 3.0 );
251  
252 <  instaTemp = tStats->getTemperature();
253 <  tStats->getPressureTensor(press);
209 <  instaVol = tStats->getVolume();
210 <  
211 <  // first evolve chi a half step
212 <  
213 <  chi += dt2 * ( instaTemp / targetTemp - 1.0) / tt2;
214 <  
215 <  for (i = 0; i < 3; i++ ) {
216 <    for (j = 0; j < 3; j++ ) {
217 <      if (i == j) {
252 >  return ( diffEta <= etaTolerance );
253 > }
254  
255 <        eta[i][j] += dt2 * instaVol *
220 <          (press[i][j] - targetPressure/p_convert) / (NkBT*tb2);
255 > template<typename T> double NPTf<T>::getConservedQuantity(void){
256  
257 <        vScale[i][j] = eta[i][j] + chi;
258 <        
259 <      } else {
260 <        
261 <        eta[i][j] += dt2 * instaVol * press[i][j] / (NkBT*tb2);
257 >  double conservedQuantity;
258 >  double totalEnergy;
259 >  double thermostat_kinetic;
260 >  double thermostat_potential;
261 >  double barostat_kinetic;
262 >  double barostat_potential;
263 >  double trEta;
264 >  double a[3][3], b[3][3];
265  
266 <        vScale[i][j] = eta[i][j];
229 <        
230 <      }
231 <    }
232 <  }
266 >  totalEnergy = tStats->getTotalE();
267  
268 <  for( i=0; i<nAtoms; i++ ){
268 >  thermostat_kinetic = fkBT * tt2 * chi * chi /
269 >    (2.0 * eConvert);
270  
271 <    atoms[i]->getVel( vel );
237 <    atoms[i]->getFrc( frc );
271 >  thermostat_potential = fkBT* integralOfChidt / eConvert;
272  
273 <    mass = atoms[i]->getMass();
274 <    
275 <    // velocity half step
242 <        
243 <    info->matVecMul3( vScale, vel, sc );
244 <    
245 <    for (j = 0; j < 3; j++) {
246 <      vel[j] += dt2 * ((frc[j]  / mass) * eConvert - sc[j]);
247 <    }
273 >  info->transposeMat3(eta, a);
274 >  info->matMul3(a, eta, b);
275 >  trEta = info->matTrace3(b);
276  
277 <    atoms[i]->setVel( vel );
278 <    
251 <    if( atoms[i]->isDirectional() ){
277 >  barostat_kinetic = NkBT * tb2 * trEta /
278 >    (2.0 * eConvert);
279  
280 <      dAtom = (DirectionalAtom *)atoms[i];
281 <          
255 <      // get and convert the torque to body frame
256 <      
257 <      dAtom->getTrq( Tb );
258 <      dAtom->lab2Body( Tb );
259 <      
260 <      // get the angular momentum, and propagate a half step
261 <      
262 <      dAtom->getJ( ji );
263 <      
264 <      for (j=0; j < 3; j++)
265 <        ji[j] += dt2 * (Tb[j] * eConvert - ji[j]*chi);
266 <      
267 <      dAtom->setJ( ji );
280 >  barostat_potential = (targetPressure * tStats->getVolume() / p_convert) /
281 >    eConvert;
282  
283 <    }                    
284 <  }
271 < }
283 >  conservedQuantity = totalEnergy + thermostat_kinetic + thermostat_potential +
284 >    barostat_kinetic + barostat_potential;
285  
286 < int NPTf::readyCheck() {
274 <
275 <  // First check to see if we have a target temperature.
276 <  // Not having one is fatal.
277 <  
278 <  if (!have_target_temp) {
279 <    sprintf( painCave.errMsg,
280 <             "NPTf error: You can't use the NPTf integrator\n"
281 <             "   without a targetTemp!\n"
282 <             );
283 <    painCave.isFatal = 1;
284 <    simError();
285 <    return -1;
286 <  }
286 >  return conservedQuantity;
287  
288 <  if (!have_target_pressure) {
289 <    sprintf( painCave.errMsg,
290 <             "NPTf error: You can't use the NPTf integrator\n"
291 <             "   without a targetPressure!\n"
292 <             );
293 <    painCave.isFatal = 1;
294 <    simError();
295 <    return -1;
296 <  }
297 <  
298 <  // We must set tauThermostat.
299 <  
300 <  if (!have_tau_thermostat) {
301 <    sprintf( painCave.errMsg,
302 <             "NPTf error: If you use the NPTf\n"
303 <             "   integrator, you must set tauThermostat.\n");
304 <    painCave.isFatal = 1;
305 <    simError();
306 <    return -1;
307 <  }    
288 > }
289  
290 <  // We must set tauBarostat.
291 <  
292 <  if (!have_tau_barostat) {
293 <    sprintf( painCave.errMsg,
313 <             "NPTf error: If you use the NPTf\n"
314 <             "   integrator, you must set tauBarostat.\n");
315 <    painCave.isFatal = 1;
316 <    simError();
317 <    return -1;
318 <  }    
290 > template<typename T> string NPTf<T>::getAdditionalParameters(void){
291 >  string parameters;
292 >  const int BUFFERSIZE = 2000; // size of the read buffer
293 >  char buffer[BUFFERSIZE];
294  
295 <  // We need NkBT a lot, so just set it here:
295 >  sprintf(buffer,"\t%G\t%G;", chi, integralOfChidt);
296 >  parameters += buffer;
297  
298 <  NkBT = (double)info->ndf * kB * targetTemp;
298 >  for(int i = 0; i < 3; i++){
299 >    sprintf(buffer,"\t%G\t%G\t%G;", eta[i][0], eta[i][1], eta[i][2]);
300 >    parameters += buffer;
301 >  }
302  
303 <  return 1;
303 >  return parameters;
304 >
305   }

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