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#include <iostream> |
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#include <cstdlib> |
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#include <cmath> |
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#ifdef IS_MPI |
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#include "mpiSimulation.hpp" |
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#include <unistd.h> |
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#endif //is_mpi |
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#include "Integrator.hpp" |
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#include "simError.h" |
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template<typename T> Integrator<T>::Integrator(SimInfo* theInfo, |
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ForceFields* the_ff){ |
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info = theInfo; |
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myFF = the_ff; |
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isFirst = 1; |
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molecules = info->molecules; |
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nMols = info->n_mol; |
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// give a little love back to the SimInfo object |
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if (info->the_integrator != NULL){ |
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delete info->the_integrator; |
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} |
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info->the_integrator = this; |
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nAtoms = info->n_atoms; |
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// check for constraints |
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constrainedA = NULL; |
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constrainedB = NULL; |
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constrainedDsqr = NULL; |
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moving = NULL; |
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moved = NULL; |
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oldPos = NULL; |
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nConstrained = 0; |
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checkConstraints(); |
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} |
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template<typename T> Integrator<T>::~Integrator(){ |
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if (nConstrained){ |
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delete[] constrainedA; |
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delete[] constrainedB; |
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delete[] constrainedDsqr; |
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delete[] moving; |
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delete[] moved; |
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delete[] oldPos; |
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} |
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} |
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template<typename T> void Integrator<T>::checkConstraints(void){ |
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isConstrained = 0; |
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Constraint* temp_con; |
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Constraint* dummy_plug; |
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temp_con = new Constraint[info->n_SRI]; |
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nConstrained = 0; |
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int constrained = 0; |
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SRI** theArray; |
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for (int i = 0; i < nMols; i++){ |
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theArray = (SRI * *) molecules[i].getMyBonds(); |
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for (int j = 0; j < molecules[i].getNBonds(); j++){ |
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constrained = theArray[j]->is_constrained(); |
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if (constrained){ |
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dummy_plug = theArray[j]->get_constraint(); |
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temp_con[nConstrained].set_a(dummy_plug->get_a()); |
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temp_con[nConstrained].set_b(dummy_plug->get_b()); |
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temp_con[nConstrained].set_dsqr(dummy_plug->get_dsqr()); |
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nConstrained++; |
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constrained = 0; |
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} |
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} |
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theArray = (SRI * *) molecules[i].getMyBends(); |
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for (int j = 0; j < molecules[i].getNBends(); j++){ |
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constrained = theArray[j]->is_constrained(); |
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if (constrained){ |
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dummy_plug = theArray[j]->get_constraint(); |
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temp_con[nConstrained].set_a(dummy_plug->get_a()); |
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temp_con[nConstrained].set_b(dummy_plug->get_b()); |
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temp_con[nConstrained].set_dsqr(dummy_plug->get_dsqr()); |
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nConstrained++; |
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constrained = 0; |
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} |
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} |
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theArray = (SRI * *) molecules[i].getMyTorsions(); |
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for (int j = 0; j < molecules[i].getNTorsions(); j++){ |
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constrained = theArray[j]->is_constrained(); |
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if (constrained){ |
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dummy_plug = theArray[j]->get_constraint(); |
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temp_con[nConstrained].set_a(dummy_plug->get_a()); |
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temp_con[nConstrained].set_b(dummy_plug->get_b()); |
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temp_con[nConstrained].set_dsqr(dummy_plug->get_dsqr()); |
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nConstrained++; |
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constrained = 0; |
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} |
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} |
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} |
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if (nConstrained > 0){ |
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isConstrained = 1; |
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if (constrainedA != NULL) |
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delete[] constrainedA; |
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if (constrainedB != NULL) |
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delete[] constrainedB; |
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if (constrainedDsqr != NULL) |
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delete[] constrainedDsqr; |
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constrainedA = new int[nConstrained]; |
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constrainedB = new int[nConstrained]; |
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constrainedDsqr = new double[nConstrained]; |
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for (int i = 0; i < nConstrained; i++){ |
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constrainedA[i] = temp_con[i].get_a(); |
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constrainedB[i] = temp_con[i].get_b(); |
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constrainedDsqr[i] = temp_con[i].get_dsqr(); |
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} |
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// save oldAtoms to check for lode balanceing later on. |
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oldAtoms = nAtoms; |
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moving = new int[nAtoms]; |
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moved = new int[nAtoms]; |
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oldPos = new double[nAtoms * 3]; |
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} |
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delete[] temp_con; |
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} |
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template<typename T> void Integrator<T>::integrate(void){ |
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int i, j; // loop counters |
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double runTime = info->run_time; |
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double sampleTime = info->sampleTime; |
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double statusTime = info->statusTime; |
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double thermalTime = info->thermalTime; |
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double resetTime = info->resetTime; |
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double currSample; |
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double currThermal; |
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double currStatus; |
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double currReset; |
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int calcPot, calcStress; |
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int isError; |
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tStats = new Thermo(info); |
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statOut = new StatWriter(info); |
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dumpOut = new DumpWriter(info); |
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atoms = info->atoms; |
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DirectionalAtom* dAtom; |
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dt = info->dt; |
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dt2 = 0.5 * dt; |
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// initialize the forces before the first step |
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calcForce(1, 1); |
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if (info->setTemp){ |
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thermalize(); |
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} |
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calcPot = 0; |
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calcStress = 0; |
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currSample = sampleTime + info->getTime(); |
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currThermal = thermalTime+ info->getTime(); |
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currStatus = statusTime + info->getTime(); |
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currReset = resetTime + info->getTime(); |
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dumpOut->writeDump(info->getTime()); |
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statOut->writeStat(info->getTime()); |
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readyCheck(); |
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#ifdef IS_MPI |
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strcpy(checkPointMsg, "The integrator is ready to go."); |
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MPIcheckPoint(); |
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#endif // is_mpi |
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while (info->getTime() < runTime){ |
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if ((info->getTime() + dt) >= currStatus){ |
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calcPot = 1; |
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calcStress = 1; |
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} |
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integrateStep(calcPot, calcStress); |
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info->incrTime(dt); |
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if (info->setTemp){ |
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if (info->getTime() >= currThermal){ |
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thermalize(); |
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currThermal += thermalTime; |
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} |
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} |
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if (info->getTime() >= currSample){ |
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dumpOut->writeDump(info->getTime()); |
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currSample += sampleTime; |
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} |
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if (info->getTime() >= currStatus){ |
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statOut->writeStat(info->getTime()); |
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calcPot = 0; |
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calcStress = 0; |
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currStatus += statusTime; |
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} |
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if (info->resetIntegrator){ |
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if (info->getTime() >= currReset){ |
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this->resetIntegrator(); |
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currReset += resetTime; |
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} |
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} |
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#ifdef IS_MPI |
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strcpy(checkPointMsg, "successfully took a time step."); |
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MPIcheckPoint(); |
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#endif // is_mpi |
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} |
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mmeineke |
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dumpOut->writeFinal(info->getTime()); |
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mmeineke |
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delete dumpOut; |
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delete statOut; |
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mmeineke |
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} |
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template<typename T> void Integrator<T>::integrateStep(int calcPot, |
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int calcStress){ |
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mmeineke |
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// Position full step, and velocity half step |
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tim |
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preMove(); |
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moveA(); |
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mmeineke |
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#ifdef IS_MPI |
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strcpy(checkPointMsg, "Succesful moveA\n"); |
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MPIcheckPoint(); |
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#endif // is_mpi |
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tim |
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mmeineke |
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// calc forces |
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calcForce(calcPot, calcStress); |
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mmeineke |
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#ifdef IS_MPI |
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strcpy(checkPointMsg, "Succesful doForces\n"); |
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mmeineke |
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MPIcheckPoint(); |
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#endif // is_mpi |
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tim |
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mmeineke |
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// finish the velocity half step |
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tim |
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mmeineke |
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moveB(); |
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tim |
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mmeineke |
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mmeineke |
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#ifdef IS_MPI |
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strcpy(checkPointMsg, "Succesful moveB\n"); |
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mmeineke |
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MPIcheckPoint(); |
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#endif // is_mpi |
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} |
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tim |
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template<typename T> void Integrator<T>::moveA(void){ |
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gezelter |
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int i, j; |
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mmeineke |
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DirectionalAtom* dAtom; |
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gezelter |
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double Tb[3], ji[3]; |
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double A[3][3], I[3][3]; |
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mmeineke |
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double angle; |
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gezelter |
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double vel[3], pos[3], frc[3]; |
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double mass; |
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mmeineke |
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|
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tim |
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for (i = 0; i < nAtoms; i++){ |
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atoms[i]->getVel(vel); |
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atoms[i]->getPos(pos); |
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atoms[i]->getFrc(frc); |
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mmeineke |
567 |
|
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gezelter |
600 |
mass = atoms[i]->getMass(); |
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mmeineke |
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|
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tim |
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for (j = 0; j < 3; j++){ |
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gezelter |
600 |
// velocity half step |
307 |
tim |
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vel[j] += (dt2 * frc[j] / mass) * eConvert; |
308 |
gezelter |
600 |
// position whole step |
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pos[j] += dt * vel[j]; |
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} |
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mmeineke |
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|
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tim |
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atoms[i]->setVel(vel); |
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atoms[i]->setPos(pos); |
314 |
gezelter |
600 |
|
315 |
tim |
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if (atoms[i]->isDirectional()){ |
316 |
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dAtom = (DirectionalAtom *) atoms[i]; |
317 |
mmeineke |
558 |
|
318 |
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// get and convert the torque to body frame |
319 |
mmeineke |
597 |
|
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tim |
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dAtom->getTrq(Tb); |
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dAtom->lab2Body(Tb); |
322 |
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323 |
mmeineke |
558 |
// get the angular momentum, and propagate a half step |
324 |
gezelter |
600 |
|
325 |
tim |
725 |
dAtom->getJ(ji); |
326 |
gezelter |
600 |
|
327 |
tim |
725 |
for (j = 0; j < 3; j++) |
328 |
gezelter |
600 |
ji[j] += (dt2 * Tb[j]) * eConvert; |
329 |
tim |
725 |
|
330 |
mmeineke |
558 |
// use the angular velocities to propagate the rotation matrix a |
331 |
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// full time step |
332 |
gezelter |
600 |
|
333 |
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dAtom->getA(A); |
334 |
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dAtom->getI(I); |
335 |
tim |
725 |
|
336 |
mmeineke |
558 |
// rotate about the x-axis |
337 |
gezelter |
600 |
angle = dt2 * ji[0] / I[0][0]; |
338 |
tim |
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this->rotate(1, 2, angle, ji, A); |
339 |
mmeineke |
597 |
|
340 |
mmeineke |
558 |
// rotate about the y-axis |
341 |
gezelter |
600 |
angle = dt2 * ji[1] / I[1][1]; |
342 |
tim |
725 |
this->rotate(2, 0, angle, ji, A); |
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344 |
mmeineke |
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// rotate about the z-axis |
345 |
gezelter |
600 |
angle = dt * ji[2] / I[2][2]; |
346 |
tim |
725 |
this->rotate(0, 1, angle, ji, A); |
347 |
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|
348 |
mmeineke |
558 |
// rotate about the y-axis |
349 |
gezelter |
600 |
angle = dt2 * ji[1] / I[1][1]; |
350 |
tim |
725 |
this->rotate(2, 0, angle, ji, A); |
351 |
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352 |
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// rotate about the x-axis |
353 |
gezelter |
600 |
angle = dt2 * ji[0] / I[0][0]; |
354 |
tim |
725 |
this->rotate(1, 2, angle, ji, A); |
355 |
mmeineke |
597 |
|
356 |
tim |
725 |
dAtom->setJ(ji); |
357 |
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dAtom->setA(A); |
358 |
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} |
359 |
mmeineke |
558 |
} |
360 |
mmeineke |
768 |
|
361 |
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if (nConstrained){ |
362 |
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constrainA(); |
363 |
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} |
364 |
mmeineke |
558 |
} |
365 |
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366 |
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|
367 |
tim |
725 |
template<typename T> void Integrator<T>::moveB(void){ |
368 |
gezelter |
600 |
int i, j; |
369 |
mmeineke |
558 |
DirectionalAtom* dAtom; |
370 |
gezelter |
600 |
double Tb[3], ji[3]; |
371 |
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double vel[3], frc[3]; |
372 |
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double mass; |
373 |
mmeineke |
558 |
|
374 |
tim |
725 |
for (i = 0; i < nAtoms; i++){ |
375 |
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atoms[i]->getVel(vel); |
376 |
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atoms[i]->getFrc(frc); |
377 |
mmeineke |
558 |
|
378 |
gezelter |
600 |
mass = atoms[i]->getMass(); |
379 |
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|
380 |
mmeineke |
558 |
// velocity half step |
381 |
tim |
725 |
for (j = 0; j < 3; j++) |
382 |
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vel[j] += (dt2 * frc[j] / mass) * eConvert; |
383 |
gezelter |
600 |
|
384 |
tim |
725 |
atoms[i]->setVel(vel); |
385 |
mmeineke |
597 |
|
386 |
tim |
725 |
if (atoms[i]->isDirectional()){ |
387 |
|
|
dAtom = (DirectionalAtom *) atoms[i]; |
388 |
|
|
|
389 |
gezelter |
600 |
// get and convert the torque to body frame |
390 |
|
|
|
391 |
tim |
725 |
dAtom->getTrq(Tb); |
392 |
|
|
dAtom->lab2Body(Tb); |
393 |
gezelter |
600 |
|
394 |
|
|
// get the angular momentum, and propagate a half step |
395 |
|
|
|
396 |
tim |
725 |
dAtom->getJ(ji); |
397 |
gezelter |
600 |
|
398 |
tim |
725 |
for (j = 0; j < 3; j++) |
399 |
gezelter |
600 |
ji[j] += (dt2 * Tb[j]) * eConvert; |
400 |
mmeineke |
597 |
|
401 |
tim |
725 |
|
402 |
|
|
dAtom->setJ(ji); |
403 |
mmeineke |
558 |
} |
404 |
|
|
} |
405 |
mmeineke |
768 |
|
406 |
|
|
if (nConstrained){ |
407 |
|
|
constrainB(); |
408 |
|
|
} |
409 |
mmeineke |
558 |
} |
410 |
|
|
|
411 |
tim |
725 |
template<typename T> void Integrator<T>::preMove(void){ |
412 |
gezelter |
600 |
int i, j; |
413 |
|
|
double pos[3]; |
414 |
mmeineke |
558 |
|
415 |
tim |
725 |
if (nConstrained){ |
416 |
|
|
for (i = 0; i < nAtoms; i++){ |
417 |
|
|
atoms[i]->getPos(pos); |
418 |
mmeineke |
561 |
|
419 |
tim |
725 |
for (j = 0; j < 3; j++){ |
420 |
|
|
oldPos[3 * i + j] = pos[j]; |
421 |
gezelter |
600 |
} |
422 |
|
|
} |
423 |
tim |
725 |
} |
424 |
gezelter |
600 |
} |
425 |
|
|
|
426 |
tim |
645 |
template<typename T> void Integrator<T>::constrainA(){ |
427 |
tim |
725 |
int i, j, k; |
428 |
mmeineke |
558 |
int done; |
429 |
gezelter |
600 |
double posA[3], posB[3]; |
430 |
|
|
double velA[3], velB[3]; |
431 |
mmeineke |
572 |
double pab[3]; |
432 |
|
|
double rab[3]; |
433 |
mmeineke |
563 |
int a, b, ax, ay, az, bx, by, bz; |
434 |
mmeineke |
558 |
double rma, rmb; |
435 |
|
|
double dx, dy, dz; |
436 |
mmeineke |
561 |
double rpab; |
437 |
mmeineke |
558 |
double rabsq, pabsq, rpabsq; |
438 |
|
|
double diffsq; |
439 |
|
|
double gab; |
440 |
|
|
int iteration; |
441 |
|
|
|
442 |
tim |
725 |
for (i = 0; i < nAtoms; i++){ |
443 |
mmeineke |
558 |
moving[i] = 0; |
444 |
tim |
725 |
moved[i] = 1; |
445 |
mmeineke |
558 |
} |
446 |
mmeineke |
567 |
|
447 |
mmeineke |
558 |
iteration = 0; |
448 |
|
|
done = 0; |
449 |
tim |
725 |
while (!done && (iteration < maxIteration)){ |
450 |
mmeineke |
558 |
done = 1; |
451 |
tim |
725 |
for (i = 0; i < nConstrained; i++){ |
452 |
mmeineke |
558 |
a = constrainedA[i]; |
453 |
|
|
b = constrainedB[i]; |
454 |
mmeineke |
563 |
|
455 |
tim |
725 |
ax = (a * 3) + 0; |
456 |
|
|
ay = (a * 3) + 1; |
457 |
|
|
az = (a * 3) + 2; |
458 |
mmeineke |
563 |
|
459 |
tim |
725 |
bx = (b * 3) + 0; |
460 |
|
|
by = (b * 3) + 1; |
461 |
|
|
bz = (b * 3) + 2; |
462 |
|
|
|
463 |
|
|
if (moved[a] || moved[b]){ |
464 |
|
|
atoms[a]->getPos(posA); |
465 |
|
|
atoms[b]->getPos(posB); |
466 |
|
|
|
467 |
|
|
for (j = 0; j < 3; j++) |
468 |
gezelter |
600 |
pab[j] = posA[j] - posB[j]; |
469 |
mmeineke |
567 |
|
470 |
tim |
725 |
//periodic boundary condition |
471 |
mmeineke |
567 |
|
472 |
tim |
725 |
info->wrapVector(pab); |
473 |
mmeineke |
572 |
|
474 |
tim |
725 |
pabsq = pab[0] * pab[0] + pab[1] * pab[1] + pab[2] * pab[2]; |
475 |
mmeineke |
558 |
|
476 |
tim |
725 |
rabsq = constrainedDsqr[i]; |
477 |
|
|
diffsq = rabsq - pabsq; |
478 |
mmeineke |
567 |
|
479 |
tim |
725 |
// the original rattle code from alan tidesley |
480 |
|
|
if (fabs(diffsq) > (tol * rabsq * 2)){ |
481 |
|
|
rab[0] = oldPos[ax] - oldPos[bx]; |
482 |
|
|
rab[1] = oldPos[ay] - oldPos[by]; |
483 |
|
|
rab[2] = oldPos[az] - oldPos[bz]; |
484 |
mmeineke |
558 |
|
485 |
tim |
725 |
info->wrapVector(rab); |
486 |
mmeineke |
567 |
|
487 |
tim |
725 |
rpab = rab[0] * pab[0] + rab[1] * pab[1] + rab[2] * pab[2]; |
488 |
mmeineke |
558 |
|
489 |
tim |
725 |
rpabsq = rpab * rpab; |
490 |
mmeineke |
558 |
|
491 |
mmeineke |
563 |
|
492 |
tim |
725 |
if (rpabsq < (rabsq * -diffsq)){ |
493 |
mmeineke |
558 |
#ifdef IS_MPI |
494 |
tim |
725 |
a = atoms[a]->getGlobalIndex(); |
495 |
|
|
b = atoms[b]->getGlobalIndex(); |
496 |
mmeineke |
558 |
#endif //is_mpi |
497 |
tim |
725 |
sprintf(painCave.errMsg, |
498 |
|
|
"Constraint failure in constrainA at atom %d and %d.\n", a, |
499 |
|
|
b); |
500 |
|
|
painCave.isFatal = 1; |
501 |
|
|
simError(); |
502 |
|
|
} |
503 |
mmeineke |
558 |
|
504 |
tim |
725 |
rma = 1.0 / atoms[a]->getMass(); |
505 |
|
|
rmb = 1.0 / atoms[b]->getMass(); |
506 |
mmeineke |
567 |
|
507 |
tim |
725 |
gab = diffsq / (2.0 * (rma + rmb) * rpab); |
508 |
mmeineke |
567 |
|
509 |
mmeineke |
572 |
dx = rab[0] * gab; |
510 |
|
|
dy = rab[1] * gab; |
511 |
|
|
dz = rab[2] * gab; |
512 |
mmeineke |
558 |
|
513 |
tim |
725 |
posA[0] += rma * dx; |
514 |
|
|
posA[1] += rma * dy; |
515 |
|
|
posA[2] += rma * dz; |
516 |
mmeineke |
558 |
|
517 |
tim |
725 |
atoms[a]->setPos(posA); |
518 |
mmeineke |
558 |
|
519 |
tim |
725 |
posB[0] -= rmb * dx; |
520 |
|
|
posB[1] -= rmb * dy; |
521 |
|
|
posB[2] -= rmb * dz; |
522 |
gezelter |
600 |
|
523 |
tim |
725 |
atoms[b]->setPos(posB); |
524 |
gezelter |
600 |
|
525 |
mmeineke |
558 |
dx = dx / dt; |
526 |
|
|
dy = dy / dt; |
527 |
|
|
dz = dz / dt; |
528 |
|
|
|
529 |
tim |
725 |
atoms[a]->getVel(velA); |
530 |
mmeineke |
558 |
|
531 |
tim |
725 |
velA[0] += rma * dx; |
532 |
|
|
velA[1] += rma * dy; |
533 |
|
|
velA[2] += rma * dz; |
534 |
mmeineke |
558 |
|
535 |
tim |
725 |
atoms[a]->setVel(velA); |
536 |
gezelter |
600 |
|
537 |
tim |
725 |
atoms[b]->getVel(velB); |
538 |
gezelter |
600 |
|
539 |
tim |
725 |
velB[0] -= rmb * dx; |
540 |
|
|
velB[1] -= rmb * dy; |
541 |
|
|
velB[2] -= rmb * dz; |
542 |
gezelter |
600 |
|
543 |
tim |
725 |
atoms[b]->setVel(velB); |
544 |
gezelter |
600 |
|
545 |
tim |
725 |
moving[a] = 1; |
546 |
|
|
moving[b] = 1; |
547 |
|
|
done = 0; |
548 |
|
|
} |
549 |
mmeineke |
558 |
} |
550 |
|
|
} |
551 |
tim |
725 |
|
552 |
|
|
for (i = 0; i < nAtoms; i++){ |
553 |
mmeineke |
558 |
moved[i] = moving[i]; |
554 |
|
|
moving[i] = 0; |
555 |
|
|
} |
556 |
|
|
|
557 |
|
|
iteration++; |
558 |
|
|
} |
559 |
|
|
|
560 |
tim |
725 |
if (!done){ |
561 |
|
|
sprintf(painCave.errMsg, |
562 |
|
|
"Constraint failure in constrainA, too many iterations: %d\n", |
563 |
|
|
iteration); |
564 |
mmeineke |
558 |
painCave.isFatal = 1; |
565 |
|
|
simError(); |
566 |
|
|
} |
567 |
mmeineke |
768 |
|
568 |
mmeineke |
558 |
} |
569 |
|
|
|
570 |
tim |
725 |
template<typename T> void Integrator<T>::constrainB(void){ |
571 |
|
|
int i, j, k; |
572 |
mmeineke |
558 |
int done; |
573 |
gezelter |
600 |
double posA[3], posB[3]; |
574 |
|
|
double velA[3], velB[3]; |
575 |
mmeineke |
558 |
double vxab, vyab, vzab; |
576 |
mmeineke |
572 |
double rab[3]; |
577 |
mmeineke |
563 |
int a, b, ax, ay, az, bx, by, bz; |
578 |
mmeineke |
558 |
double rma, rmb; |
579 |
|
|
double dx, dy, dz; |
580 |
|
|
double rabsq, pabsq, rvab; |
581 |
|
|
double diffsq; |
582 |
|
|
double gab; |
583 |
|
|
int iteration; |
584 |
|
|
|
585 |
tim |
725 |
for (i = 0; i < nAtoms; i++){ |
586 |
mmeineke |
558 |
moving[i] = 0; |
587 |
|
|
moved[i] = 1; |
588 |
|
|
} |
589 |
|
|
|
590 |
|
|
done = 0; |
591 |
mmeineke |
561 |
iteration = 0; |
592 |
tim |
725 |
while (!done && (iteration < maxIteration)){ |
593 |
mmeineke |
567 |
done = 1; |
594 |
|
|
|
595 |
tim |
725 |
for (i = 0; i < nConstrained; i++){ |
596 |
mmeineke |
558 |
a = constrainedA[i]; |
597 |
|
|
b = constrainedB[i]; |
598 |
|
|
|
599 |
tim |
725 |
ax = (a * 3) + 0; |
600 |
|
|
ay = (a * 3) + 1; |
601 |
|
|
az = (a * 3) + 2; |
602 |
mmeineke |
563 |
|
603 |
tim |
725 |
bx = (b * 3) + 0; |
604 |
|
|
by = (b * 3) + 1; |
605 |
|
|
bz = (b * 3) + 2; |
606 |
mmeineke |
563 |
|
607 |
tim |
725 |
if (moved[a] || moved[b]){ |
608 |
|
|
atoms[a]->getVel(velA); |
609 |
|
|
atoms[b]->getVel(velB); |
610 |
mmeineke |
558 |
|
611 |
tim |
725 |
vxab = velA[0] - velB[0]; |
612 |
|
|
vyab = velA[1] - velB[1]; |
613 |
|
|
vzab = velA[2] - velB[2]; |
614 |
gezelter |
600 |
|
615 |
tim |
725 |
atoms[a]->getPos(posA); |
616 |
|
|
atoms[b]->getPos(posB); |
617 |
gezelter |
600 |
|
618 |
tim |
725 |
for (j = 0; j < 3; j++) |
619 |
gezelter |
600 |
rab[j] = posA[j] - posB[j]; |
620 |
mmeineke |
558 |
|
621 |
tim |
725 |
info->wrapVector(rab); |
622 |
mmeineke |
558 |
|
623 |
tim |
725 |
rma = 1.0 / atoms[a]->getMass(); |
624 |
|
|
rmb = 1.0 / atoms[b]->getMass(); |
625 |
mmeineke |
558 |
|
626 |
tim |
725 |
rvab = rab[0] * vxab + rab[1] * vyab + rab[2] * vzab; |
627 |
gezelter |
600 |
|
628 |
tim |
725 |
gab = -rvab / ((rma + rmb) * constrainedDsqr[i]); |
629 |
gezelter |
600 |
|
630 |
tim |
725 |
if (fabs(gab) > tol){ |
631 |
|
|
dx = rab[0] * gab; |
632 |
|
|
dy = rab[1] * gab; |
633 |
|
|
dz = rab[2] * gab; |
634 |
|
|
|
635 |
|
|
velA[0] += rma * dx; |
636 |
|
|
velA[1] += rma * dy; |
637 |
|
|
velA[2] += rma * dz; |
638 |
|
|
|
639 |
|
|
atoms[a]->setVel(velA); |
640 |
|
|
|
641 |
|
|
velB[0] -= rmb * dx; |
642 |
|
|
velB[1] -= rmb * dy; |
643 |
|
|
velB[2] -= rmb * dz; |
644 |
|
|
|
645 |
|
|
atoms[b]->setVel(velB); |
646 |
|
|
|
647 |
|
|
moving[a] = 1; |
648 |
|
|
moving[b] = 1; |
649 |
|
|
done = 0; |
650 |
|
|
} |
651 |
mmeineke |
558 |
} |
652 |
|
|
} |
653 |
|
|
|
654 |
tim |
725 |
for (i = 0; i < nAtoms; i++){ |
655 |
mmeineke |
558 |
moved[i] = moving[i]; |
656 |
|
|
moving[i] = 0; |
657 |
|
|
} |
658 |
tim |
725 |
|
659 |
mmeineke |
558 |
iteration++; |
660 |
|
|
} |
661 |
|
|
|
662 |
tim |
725 |
if (!done){ |
663 |
|
|
sprintf(painCave.errMsg, |
664 |
|
|
"Constraint failure in constrainB, too many iterations: %d\n", |
665 |
|
|
iteration); |
666 |
mmeineke |
558 |
painCave.isFatal = 1; |
667 |
|
|
simError(); |
668 |
tim |
725 |
} |
669 |
mmeineke |
558 |
} |
670 |
|
|
|
671 |
tim |
725 |
template<typename T> void Integrator<T>::rotate(int axes1, int axes2, |
672 |
|
|
double angle, double ji[3], |
673 |
|
|
double A[3][3]){ |
674 |
|
|
int i, j, k; |
675 |
mmeineke |
558 |
double sinAngle; |
676 |
|
|
double cosAngle; |
677 |
|
|
double angleSqr; |
678 |
|
|
double angleSqrOver4; |
679 |
|
|
double top, bottom; |
680 |
|
|
double rot[3][3]; |
681 |
|
|
double tempA[3][3]; |
682 |
|
|
double tempJ[3]; |
683 |
|
|
|
684 |
|
|
// initialize the tempA |
685 |
|
|
|
686 |
tim |
725 |
for (i = 0; i < 3; i++){ |
687 |
|
|
for (j = 0; j < 3; j++){ |
688 |
gezelter |
600 |
tempA[j][i] = A[i][j]; |
689 |
mmeineke |
558 |
} |
690 |
|
|
} |
691 |
|
|
|
692 |
|
|
// initialize the tempJ |
693 |
|
|
|
694 |
tim |
725 |
for (i = 0; i < 3; i++) |
695 |
|
|
tempJ[i] = ji[i]; |
696 |
|
|
|
697 |
mmeineke |
558 |
// initalize rot as a unit matrix |
698 |
|
|
|
699 |
|
|
rot[0][0] = 1.0; |
700 |
|
|
rot[0][1] = 0.0; |
701 |
|
|
rot[0][2] = 0.0; |
702 |
|
|
|
703 |
|
|
rot[1][0] = 0.0; |
704 |
|
|
rot[1][1] = 1.0; |
705 |
|
|
rot[1][2] = 0.0; |
706 |
tim |
725 |
|
707 |
mmeineke |
558 |
rot[2][0] = 0.0; |
708 |
|
|
rot[2][1] = 0.0; |
709 |
|
|
rot[2][2] = 1.0; |
710 |
tim |
725 |
|
711 |
mmeineke |
558 |
// use a small angle aproximation for sin and cosine |
712 |
|
|
|
713 |
tim |
725 |
angleSqr = angle * angle; |
714 |
mmeineke |
558 |
angleSqrOver4 = angleSqr / 4.0; |
715 |
|
|
top = 1.0 - angleSqrOver4; |
716 |
|
|
bottom = 1.0 + angleSqrOver4; |
717 |
|
|
|
718 |
|
|
cosAngle = top / bottom; |
719 |
|
|
sinAngle = angle / bottom; |
720 |
|
|
|
721 |
|
|
rot[axes1][axes1] = cosAngle; |
722 |
|
|
rot[axes2][axes2] = cosAngle; |
723 |
|
|
|
724 |
|
|
rot[axes1][axes2] = sinAngle; |
725 |
|
|
rot[axes2][axes1] = -sinAngle; |
726 |
tim |
725 |
|
727 |
mmeineke |
558 |
// rotate the momentum acoording to: ji[] = rot[][] * ji[] |
728 |
tim |
725 |
|
729 |
|
|
for (i = 0; i < 3; i++){ |
730 |
mmeineke |
558 |
ji[i] = 0.0; |
731 |
tim |
725 |
for (k = 0; k < 3; k++){ |
732 |
mmeineke |
558 |
ji[i] += rot[i][k] * tempJ[k]; |
733 |
|
|
} |
734 |
|
|
} |
735 |
|
|
|
736 |
|
|
// rotate the Rotation matrix acording to: |
737 |
|
|
// A[][] = A[][] * transpose(rot[][]) |
738 |
|
|
|
739 |
|
|
|
740 |
mmeineke |
561 |
// NOte for as yet unknown reason, we are performing the |
741 |
mmeineke |
558 |
// calculation as: |
742 |
|
|
// transpose(A[][]) = transpose(A[][]) * transpose(rot[][]) |
743 |
|
|
|
744 |
tim |
725 |
for (i = 0; i < 3; i++){ |
745 |
|
|
for (j = 0; j < 3; j++){ |
746 |
gezelter |
600 |
A[j][i] = 0.0; |
747 |
tim |
725 |
for (k = 0; k < 3; k++){ |
748 |
|
|
A[j][i] += tempA[i][k] * rot[j][k]; |
749 |
mmeineke |
558 |
} |
750 |
|
|
} |
751 |
|
|
} |
752 |
|
|
} |
753 |
tim |
677 |
|
754 |
tim |
725 |
template<typename T> void Integrator<T>::calcForce(int calcPot, int calcStress){ |
755 |
|
|
myFF->doForces(calcPot, calcStress); |
756 |
tim |
677 |
} |
757 |
|
|
|
758 |
|
|
template<typename T> void Integrator<T>::thermalize(){ |
759 |
tim |
725 |
tStats->velocitize(); |
760 |
tim |
677 |
} |
761 |
tim |
763 |
|
762 |
|
|
template<typename T> double Integrator<T>::getConservedQuantity(void){ |
763 |
|
|
return tStats->getTotalE(); |
764 |
mmeineke |
768 |
} |