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Comparing trunk/OOPSE/libmdtools/NPTi.cpp (file contents):
Revision 577 by gezelter, Wed Jul 9 01:41:11 2003 UTC vs.
Revision 787 by mmeineke, Thu Sep 25 19:27:15 2003 UTC

# Line 1 | Line 1
1 + #include <cmath>
2   #include "Atom.hpp"
3   #include "SRI.hpp"
4   #include "AbstractClasses.hpp"
# Line 8 | Line 9
9   #include "Integrator.hpp"
10   #include "simError.h"
11  
12 + #ifdef IS_MPI
13 + #include "mpiSimulation.hpp"
14 + #endif
15  
16   // Basic isotropic thermostating and barostating via the Melchionna
17   // modification of the Hoover algorithm:
# Line 19 | Line 23
23   //
24   //    Hoover, W. G., 1986, Phys. Rev. A, 34, 2499.
25  
26 < NPTi::NPTi ( SimInfo *theInfo, ForceFields* the_ff):
27 <  Integrator( theInfo, the_ff )
26 > template<typename T> NPTi<T>::NPTi ( SimInfo *theInfo, ForceFields* the_ff):
27 >  T( theInfo, the_ff )
28   {
25 –  chi = 0.0;
29    eta = 0.0;
30 <  have_tau_thermostat = 0;
28 <  have_tau_barostat = 0;
29 <  have_target_temp = 0;
30 <  have_target_pressure = 0;
30 >  oldEta = 0.0;
31   }
32  
33 < void NPTi::moveA() {
34 <  
35 <  int i,j,k;
36 <  int atomIndex, aMatIndex;
37 <  DirectionalAtom* dAtom;
38 <  double Tb[3];
39 <  double ji[3];
40 <  double rj[3];
41 <  double instaTemp, instaPress, instaVol;
42 <  double tt2, tb2;
43 <  double angle;
33 > template<typename T> NPTi<T>::~NPTi() {
34 >  //nothing for now
35 > }
36  
37 <  tt2 = tauThermostat * tauThermostat;
38 <  tb2 = tauBarostat * tauBarostat;
37 > template<typename T> void NPTi<T>::resetIntegrator() {
38 >  eta = 0.0;
39 >  T::resetIntegrator();
40 > }
41  
42 <  instaTemp = tStats->getTemperature();
43 <  instaPress = tStats->getPressure();
44 <  instaVol = tStats->getVolume();
45 <  
46 <  // first evolve chi a half step
42 > template<typename T> void NPTi<T>::evolveEtaA() {
43 >  eta += dt2 * ( instaVol * (instaPress - targetPressure) /
44 >                 (p_convert*NkBT*tb2));
45 >  oldEta = eta;
46 > }
47 >
48 > template<typename T> void NPTi<T>::evolveEtaB() {
49    
50 <  chi += dt2 * ( instaTemp / targetTemp - 1.0) / tt2;
51 <  eta += dt2 * ( instaVol * (instaPress - targetPressure) / (NkBT*tb2));
50 >  prevEta = eta;
51 >  eta = oldEta + dt2 * ( instaVol * (instaPress - targetPressure) /
52 >                 (p_convert*NkBT*tb2));
53 > }
54  
55 <  for( i=0; i<nAtoms; i++ ){
56 <    atomIndex = i * 3;
59 <    aMatIndex = i * 9;
60 <    
61 <    // velocity half step
62 <    for( j=atomIndex; j<(atomIndex+3); j++ )
63 <      vel[j] += dt2 * ((frc[j]/atoms[i]->getMass())*eConvert
64 <                       - vel[j]*(chi+eta));
55 > template<typename T> void NPTi<T>::getVelScaleA(double sc[3], double vel[3]) {
56 >  int i;
57  
58 <    // position whole step    
58 >  for(i=0; i<3; i++) sc[i] = vel[i] * ( chi + eta );
59 > }
60  
61 <    rj[0] = pos[atomIndex];
62 <    rj[1] = pos[atomIndex+1];
70 <    rj[2] = pos[atomIndex+2];
71 <    
72 <    info->wrapVector(rj);
61 > template<typename T> void NPTi<T>::getVelScaleB(double sc[3], int index ){
62 >  int i;
63  
64 <    pos[atomIndex] += dt * (vel[atomIndex] + eta*rj[0]);
65 <    pos[atomIndex+1] += dt * (vel[atomIndex+1] + eta*rj[1]);
76 <    pos[atomIndex+2] += dt * (vel[atomIndex+2] + eta*rj[2]);
77 <  
78 <    if( atoms[i]->isDirectional() ){
64 >  for(i=0; i<3; i++) sc[i] = oldVel[index*3 + i] * ( chi + eta );
65 > }
66  
80 –      dAtom = (DirectionalAtom *)atoms[i];
81 –          
82 –      // get and convert the torque to body frame
83 –      
84 –      Tb[0] = dAtom->getTx();
85 –      Tb[1] = dAtom->getTy();
86 –      Tb[2] = dAtom->getTz();
87 –      
88 –      dAtom->lab2Body( Tb );
89 –      
90 –      // get the angular momentum, and propagate a half step
67  
68 <      ji[0] = dAtom->getJx();
69 <      ji[1] = dAtom->getJy();
70 <      ji[2] = dAtom->getJz();
95 <      
96 <      ji[0] += dt2 * (Tb[0] * eConvert - ji[0]*chi);
97 <      ji[1] += dt2 * (Tb[1] * eConvert - ji[1]*chi);
98 <      ji[2] += dt2 * (Tb[2] * eConvert - ji[2]*chi);
99 <      
100 <      // use the angular velocities to propagate the rotation matrix a
101 <      // full time step
102 <      
103 <      // rotate about the x-axis      
104 <      angle = dt2 * ji[0] / dAtom->getIxx();
105 <      this->rotate( 1, 2, angle, ji, &Amat[aMatIndex] );
106 <      
107 <      // rotate about the y-axis
108 <      angle = dt2 * ji[1] / dAtom->getIyy();
109 <      this->rotate( 2, 0, angle, ji, &Amat[aMatIndex] );
110 <      
111 <      // rotate about the z-axis
112 <      angle = dt * ji[2] / dAtom->getIzz();
113 <      this->rotate( 0, 1, angle, ji, &Amat[aMatIndex] );
114 <      
115 <      // rotate about the y-axis
116 <      angle = dt2 * ji[1] / dAtom->getIyy();
117 <      this->rotate( 2, 0, angle, ji, &Amat[aMatIndex] );
118 <      
119 <       // rotate about the x-axis
120 <      angle = dt2 * ji[0] / dAtom->getIxx();
121 <      this->rotate( 1, 2, angle, ji, &Amat[aMatIndex] );
122 <      
123 <      dAtom->setJx( ji[0] );
124 <      dAtom->setJy( ji[1] );
125 <      dAtom->setJz( ji[2] );
126 <    }
127 <    
128 <  }
129 <  // Scale the box after all the positions have been moved:
68 > template<typename T> void NPTi<T>::getPosScale(double pos[3], double COM[3],
69 >                                               int index, double sc[3]){
70 >  int j;
71  
72 <  info->scaleBox(exp(dt*eta));
72 >  for(j=0; j<3; j++)
73 >    sc[j] = ( oldPos[index*3+j] + pos[j]) / 2.0 - COM[j];
74  
75 +  for(j=0; j<3; j++)
76 +    sc[j] *= eta;
77   }
78  
79 < void NPTi::moveB( void ){
136 <  int i,j,k;
137 <  int atomIndex;
138 <  DirectionalAtom* dAtom;
139 <  double Tb[3];
140 <  double ji[3];
141 <  double instaTemp, instaPress, instaVol;
142 <  double tt2, tb2;
143 <  
144 <  tt2 = tauThermostat * tauThermostat;
145 <  tb2 = tauBarostat * tauBarostat;
79 > template<typename T> void NPTi<T>::scaleSimBox( void ){
80  
81 <  instaTemp = tStats->getTemperature();
148 <  instaPress = tStats->getPressure();
149 <  instaVol = tStats->getVolume();
81 >  double scaleFactor;
82  
83 <  chi += dt2 * ( instaTemp / targetTemp - 1.0) / tt2;
152 <  eta += dt2 * ( instaVol * (instaPress - targetPressure) / (NkBT*tb2));
153 <  
154 <  for( i=0; i<nAtoms; i++ ){
155 <    atomIndex = i * 3;
156 <    
157 <    // velocity half step
158 <    for( j=atomIndex; j<(atomIndex+3); j++ )
159 <    for( j=atomIndex; j<(atomIndex+3); j++ )
160 <      vel[j] += dt2 * ((frc[j]/atoms[i]->getMass())*eConvert
161 <                       - vel[j]*(chi+eta));
162 <    
163 <    if( atoms[i]->isDirectional() ){
164 <      
165 <      dAtom = (DirectionalAtom *)atoms[i];
166 <      
167 <      // get and convert the torque to body frame
168 <      
169 <      Tb[0] = dAtom->getTx();
170 <      Tb[1] = dAtom->getTy();
171 <      Tb[2] = dAtom->getTz();
172 <      
173 <      dAtom->lab2Body( Tb );
174 <      
175 <      // get the angular momentum, and complete the angular momentum
176 <      // half step
177 <      
178 <      ji[0] = dAtom->getJx();
179 <      ji[1] = dAtom->getJy();
180 <      ji[2] = dAtom->getJz();
181 <      
182 <      ji[0] += dt2 * (Tb[0] * eConvert - ji[0]*chi);
183 <      ji[1] += dt2 * (Tb[1] * eConvert - ji[1]*chi);
184 <      ji[2] += dt2 * (Tb[2] * eConvert - ji[2]*chi);
185 <      
186 <      dAtom->setJx( ji[0] );
187 <      dAtom->setJy( ji[1] );
188 <      dAtom->setJz( ji[2] );
189 <    }
190 <  }
191 < }
83 >  scaleFactor = exp(dt*eta);
84  
85 < int NPTi::readyCheck() {
194 <
195 <  // First check to see if we have a target temperature.
196 <  // Not having one is fatal.
197 <  
198 <  if (!have_target_temp) {
85 >  if ((scaleFactor > 1.1) || (scaleFactor < 0.9)) {
86      sprintf( painCave.errMsg,
87 <             "NPTi error: You can't use the NPTi integrator\n"
88 <             "   without a targetTemp!\n"
87 >             "NPTi error: Attempting a Box scaling of more than 10 percent"
88 >             " check your tauBarostat, as it is probably too small!\n"
89 >             " eta = %lf, scaleFactor = %lf\n", eta, scaleFactor
90               );
91      painCave.isFatal = 1;
92      simError();
93 <    return -1;
94 <  }
93 >  } else {        
94 >    info->scaleBox(scaleFactor);      
95 >  }  
96  
97 <  if (!have_target_pressure) {
98 <    sprintf( painCave.errMsg,
99 <             "NPTi error: You can't use the NPTi integrator\n"
100 <             "   without a targetPressure!\n"
101 <             );
102 <    painCave.isFatal = 1;
103 <    simError();
104 <    return -1;
105 <  }
97 > }
98 >
99 > template<typename T> bool NPTi<T>::etaConverged() {
100 >
101 >  return ( fabs(prevEta - eta) <= etaTolerance );
102 > }
103 >
104 > template<typename T> double NPTi<T>::getConservedQuantity(void){
105 >
106 >  double conservedQuantity;
107 >  double Energy;
108 >  double thermostat_kinetic;
109 >  double thermostat_potential;
110 >  double barostat_kinetic;
111 >  double barostat_potential;
112    
113 <  // We must set tauThermostat.
219 <  
220 <  if (!have_tau_thermostat) {
221 <    sprintf( painCave.errMsg,
222 <             "NPTi error: If you use the NPTi\n"
223 <             "   integrator, you must set tauThermostat.\n");
224 <    painCave.isFatal = 1;
225 <    simError();
226 <    return -1;
227 <  }    
113 >  Energy = tStats->getTotalE();
114  
115 <  // We must set tauBarostat.
116 <  
231 <  if (!have_tau_barostat) {
232 <    sprintf( painCave.errMsg,
233 <             "NPTi error: If you use the NPTi\n"
234 <             "   integrator, you must set tauBarostat.\n");
235 <    painCave.isFatal = 1;
236 <    simError();
237 <    return -1;
238 <  }    
115 >  thermostat_kinetic = fkBT* tt2 * chi * chi /
116 >    (2.0 * eConvert);
117  
118 <  // We need NkBT a lot, so just set it here:
118 >  thermostat_potential = fkBT* integralOfChidt / eConvert;
119  
242 –  NkBT = (double)info->ndf * kB * targetTemp;
120  
121 <  return 1;
121 >  barostat_kinetic = 3.0 * NkBT * tb2 * eta * eta /
122 >    (2.0 * eConvert);
123 >  
124 >  barostat_potential = (targetPressure * tStats->getVolume() / p_convert) /
125 >    eConvert;
126 >
127 >  conservedQuantity = Energy + thermostat_kinetic + thermostat_potential +
128 >    barostat_kinetic + barostat_potential;
129 >  
130 > //   cout.width(8);
131 > //   cout.precision(8);
132 >
133 > //   cerr << info->getTime() << "\t" << Energy << "\t" << thermostat_kinetic <<
134 > //       "\t" << thermostat_potential << "\t" << barostat_kinetic <<
135 > //       "\t" << barostat_potential << "\t" << conservedQuantity << endl;
136 >  return conservedQuantity;
137   }

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