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#include <cmath> |
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#ifdef IS_MPI |
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#include <mpi++.h> |
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#endif //is_mpi |
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#include "Thermo.hpp" |
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#include "SRI.hpp" |
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#include "LRI.hpp" |
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#include "Integrator.hpp" |
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#define BASE_SEED 123456789 |
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Thermo::Thermo( SimInfo* the_entry_plug ) { |
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entry_plug = the_entry_plug; |
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int baseSeed = BASE_SEED; |
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gaussStream = new gaussianSPRNG( baseSeed ); |
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} |
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Thermo::~Thermo(){ |
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delete gaussStream; |
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} |
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double Thermo::getKinetic(){ |
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const double e_convert = 4.184E-4; // convert kcal/mol -> (amu A^2)/fs^2 |
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#ifdef IS_MPI |
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MPI_COMM_WORLD.Allreduce(&kinetic,&kinetic_global,1,MPI_DOUBLE,MPI_SUM); |
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kinetic = kinetic_global; |
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#endif |
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#endif //is_mpi |
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kinetic = kinetic * 0.5 / e_convert; |
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potential = 0.0; |
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potential_global = 0.0; |
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potential += entry_plug->longRange->get_potential();; |
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potential += entry_plug->lrPot; |
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// std::cerr << "long range potential: " << potential << "\n"; |
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for( el=0; el<nSRI; el++ ){ |
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#ifdef IS_MPI |
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MPI_COMM_WORLD.Allreduce(&potential,&potential_global,1,MPI_DOUBLE,MPI_SUM); |
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potential = potential_global; |
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#endif |
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#endif // is_mpi |
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return potential; |
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} |
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// picks random velocities from a gaussian distribution |
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// centered on vbar |
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#ifndef USE_SPRNG |
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/* If we are using mpi, we need to use the SPRNG random |
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generator. The non drand48 generator will just repeat |
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the same numbers for every node creating a non-gaussian |
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distribution for the simulation. drand48 is fine for the |
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single processor version of the code, but SPRNG should |
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still be preferred for consistency. |
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*/ |
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#ifdef IS_MPI |
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#error "SPRNG random number generator must be used for MPI" |
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#else |
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#warning "Using drand48 for random number generation" |
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#endif // is_mpi |
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x = drand48(); |
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y = drand48(); |
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vx = vbar * sqrt( -2.0 * log(x)) * cos(2 * M_PI * y); |
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x = drand48(); |
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y = drand48(); |
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vz = vbar * sqrt( -2.0 * log(x)) * cos(2 * M_PI * y); |
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#endif // use_spring |
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#ifdef USE_SPRNG |
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vx = vbar * gaussStream->getGaussian(); |
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vy = vbar * gaussStream->getGaussian(); |
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vz = vbar * gaussStream->getGaussian(); |
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#endif // use_spring |
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atoms[vr]->set_vx( vx ); |
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atoms[vr]->set_vy( vy ); |
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atoms[vr]->set_vz( vz ); |
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if( atoms[i]->isDirectional() ){ |
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dAtom = (DirectionalAtom *)atoms[i]; |
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#ifndef USE_SPRNG |
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#ifdef IS_MPI |
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#error "SPRNG random number generator must be used for MPI" |
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#else // is_mpi |
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#warning "Using drand48 for random number generation" |
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#endif // is_MPI |
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vbar = sqrt( 2.0 * kebar * dAtom->getIxx() ); |
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x = drand48(); |
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x = drand48(); |
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y = drand48(); |
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jz = vbar * sqrt( -2.0 * log(x)) * cos(2 * M_PI * y); |
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#else //use_sprng |
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vbar = sqrt( 2.0 * kebar * dAtom->getIxx() ); |
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jx = vbar * gaussStream->getGaussian(); |
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vbar = sqrt( 2.0 * kebar * dAtom->getIyy() ); |
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jy = vbar * gaussStream->getGaussian(); |
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vbar = sqrt( 2.0 * kebar * dAtom->getIzz() ); |
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jz = vbar * gaussStream->getGaussian(); |
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#endif //use_sprng |
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dAtom->setJx( jx ); |
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dAtom->setJy( jy ); |
