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#include "Atom.hpp" |
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#include "SRI.hpp" |
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#include "AbstractClasses.hpp" |
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#include "SimInfo.hpp" |
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#include "ForceFields.hpp" |
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#include "Thermo.hpp" |
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#include "ReadWrite.hpp" |
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#include "Integrator.hpp" |
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#include "simError.h" |
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|
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|
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// Basic isotropic thermostating and barostating via the Melchionna |
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// modification of the Hoover algorithm: |
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// |
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// Melchionna, S., Ciccotti, G., and Holian, B. L., 1993, |
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// Molec. Phys., 78, 533. |
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// |
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// and |
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// |
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// Hoover, W. G., 1986, Phys. Rev. A, 34, 2499. |
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|
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NPTf::NPTf ( SimInfo *theInfo, ForceFields* the_ff): |
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Integrator( theInfo, the_ff ) |
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{ |
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int i; |
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chi = 0.0; |
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for(i = 0; i < 9; i++) eta[i] = 0.0; |
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have_tau_thermostat = 0; |
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have_tau_barostat = 0; |
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have_target_temp = 0; |
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have_target_pressure = 0; |
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} |
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|
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void NPTf::moveA() { |
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|
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int i,j,k; |
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int atomIndex, aMatIndex; |
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DirectionalAtom* dAtom; |
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double Tb[3]; |
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double ji[3]; |
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double rj[3]; |
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double instaTemp, instaPress, instaVol; |
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double tt2, tb2; |
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double angle; |
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double press[9]; |
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const double p_convert = 1.63882576e8; |
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|
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tt2 = tauThermostat * tauThermostat; |
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tb2 = tauBarostat * tauBarostat; |
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|
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instaTemp = tStats->getTemperature(); |
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tStats->getPressureTensor(press); |
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|
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for (i=0; i < 9; i++) press[i] *= p_convert; |
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|
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instaVol = tStats->getVolume(); |
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|
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// first evolve chi a half step |
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|
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chi += dt2 * ( instaTemp / targetTemp - 1.0) / tt2; |
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|
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eta[0] += dt2 * instaVol * (press[0] - targetPressure) / (NkBT*tb2); |
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eta[1] += dt2 * instaVol * press[1] / (NkBT*tb2); |
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eta[2] += dt2 * instaVol * press[2] / (NkBT*tb2); |
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eta[3] += dt2 * instaVol * press[3] / (NkBT*tb2); |
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eta[4] += dt2 * instaVol * (press[4] - targetPressure) / (NkBT*tb2); |
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eta[5] += dt2 * instaVol * press[5] / (NkBT*tb2); |
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eta[6] += dt2 * instaVol * press[6] / (NkBT*tb2); |
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eta[7] += dt2 * instaVol * press[7] / (NkBT*tb2); |
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eta[8] += dt2 * instaVol * (press[8] - targetPressure) / (NkBT*tb2); |
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|
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for( i=0; i<nAtoms; i++ ){ |
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atomIndex = i * 3; |
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aMatIndex = i * 9; |
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|
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// velocity half step |
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|
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vx = vel[atomIndex]; |
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vy = vel[atomIndex+1]; |
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vz = vel[atomIndex+2]; |
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|
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scx = (chi + eta[0])*vx + eta[1]*vy + eta[2]*vz; |
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scy = eta[3]*vx + (chi + eta[4])*vy + eta[5]*vz; |
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scz = eta[6]*vx + eta[7]*vy + (chi + eta[8])*vz; |
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|
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vx += dt2 * ((frc[atomIndex] /atoms[i]->getMass())*eConvert - scx); |
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vy += dt2 * ((frc[atomIndex+1]/atoms[i]->getMass())*eConvert - scy); |
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vz += dt2 * ((frc[atomIndex+2]/atoms[i]->getMass())*eConvert - scz); |
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|
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vel[atomIndex] = vx; |
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vel[atomIndex+1] = vy; |
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vel[atomIndex+2] = vz; |
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|
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// position whole step |
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|
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rj[0] = pos[atomIndex]; |
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rj[1] = pos[atomIndex+1]; |
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rj[2] = pos[atomIndex+2]; |
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|
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info->wrapVector(rj); |
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|
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scx = eta[0]*rj[0] + eta[1]*rj[1] + eta[2]*rj[2]; |
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scy = eta[3]*rj[0] + eta[4]*rj[1] + eta[5]*rj[2]; |
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scz = eta[6]*rj[0] + eta[7]*rj[1] + eta[8]*rj[2]; |
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|
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pos[atomIndex] += dt * (vel[atomIndex] + scx); |
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pos[atomIndex+1] += dt * (vel[atomIndex+1] + scy); |
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pos[atomIndex+2] += dt * (vel[atomIndex+2] + scz); |
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|
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if( atoms[i]->isDirectional() ){ |
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|
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dAtom = (DirectionalAtom *)atoms[i]; |
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|
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// get and convert the torque to body frame |
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|
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Tb[0] = dAtom->getTx(); |
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Tb[1] = dAtom->getTy(); |
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Tb[2] = dAtom->getTz(); |
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|
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dAtom->lab2Body( Tb ); |
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|
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// get the angular momentum, and propagate a half step |
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|
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ji[0] = dAtom->getJx(); |
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ji[1] = dAtom->getJy(); |
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ji[2] = dAtom->getJz(); |
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|
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ji[0] += dt2 * (Tb[0] * eConvert - ji[0]*chi); |
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ji[1] += dt2 * (Tb[1] * eConvert - ji[1]*chi); |
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ji[2] += dt2 * (Tb[2] * eConvert - ji[2]*chi); |
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|
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// use the angular velocities to propagate the rotation matrix a |
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// full time step |
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|
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// rotate about the x-axis |
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angle = dt2 * ji[0] / dAtom->getIxx(); |
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this->rotate( 1, 2, angle, ji, &Amat[aMatIndex] ); |
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|
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// rotate about the y-axis |
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angle = dt2 * ji[1] / dAtom->getIyy(); |
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this->rotate( 2, 0, angle, ji, &Amat[aMatIndex] ); |
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|
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// rotate about the z-axis |
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angle = dt * ji[2] / dAtom->getIzz(); |
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this->rotate( 0, 1, angle, ji, &Amat[aMatIndex] ); |
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|
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// rotate about the y-axis |
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angle = dt2 * ji[1] / dAtom->getIyy(); |
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this->rotate( 2, 0, angle, ji, &Amat[aMatIndex] ); |
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|
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// rotate about the x-axis |
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angle = dt2 * ji[0] / dAtom->getIxx(); |
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this->rotate( 1, 2, angle, ji, &Amat[aMatIndex] ); |
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|
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dAtom->setJx( ji[0] ); |
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dAtom->setJy( ji[1] ); |
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dAtom->setJz( ji[2] ); |
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} |
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|
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} |
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|
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// Scale the box after all the positions have been moved: |
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|
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|
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|
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// Use a taylor expansion for eta products |
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|
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info->getBoxM(hm); |
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|
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|
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|
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|
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|
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|
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info->scaleBox(exp(dt*eta)); |
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|
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|
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} |
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|
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void NPTi::moveB( void ){ |
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int i,j,k; |
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int atomIndex; |
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DirectionalAtom* dAtom; |
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double Tb[3]; |
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double ji[3]; |
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double instaTemp, instaPress, instaVol; |
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double tt2, tb2; |
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|
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tt2 = tauThermostat * tauThermostat; |
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tb2 = tauBarostat * tauBarostat; |
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|
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instaTemp = tStats->getTemperature(); |
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instaPress = tStats->getPressure(); |
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instaVol = tStats->getVolume(); |
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|
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chi += dt2 * ( instaTemp / targetTemp - 1.0) / tt2; |
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eta += dt2 * ( instaVol * (instaPress - targetPressure) / (NkBT*tb2)); |
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|
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for( i=0; i<nAtoms; i++ ){ |
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atomIndex = i * 3; |
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|
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// velocity half step |
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for( j=atomIndex; j<(atomIndex+3); j++ ) |
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for( j=atomIndex; j<(atomIndex+3); j++ ) |
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vel[j] += dt2 * ((frc[j]/atoms[i]->getMass())*eConvert |
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- vel[j]*(chi+eta)); |
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|
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if( atoms[i]->isDirectional() ){ |
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|
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dAtom = (DirectionalAtom *)atoms[i]; |
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|
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// get and convert the torque to body frame |
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|
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Tb[0] = dAtom->getTx(); |
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Tb[1] = dAtom->getTy(); |
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Tb[2] = dAtom->getTz(); |
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|
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dAtom->lab2Body( Tb ); |
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|
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// get the angular momentum, and complete the angular momentum |
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// half step |
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|
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ji[0] = dAtom->getJx(); |
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ji[1] = dAtom->getJy(); |
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ji[2] = dAtom->getJz(); |
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|
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ji[0] += dt2 * (Tb[0] * eConvert - ji[0]*chi); |
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ji[1] += dt2 * (Tb[1] * eConvert - ji[1]*chi); |
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ji[2] += dt2 * (Tb[2] * eConvert - ji[2]*chi); |
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|
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dAtom->setJx( ji[0] ); |
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dAtom->setJy( ji[1] ); |
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dAtom->setJz( ji[2] ); |
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} |
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} |
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} |
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|
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int NPTi::readyCheck() { |
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|
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// First check to see if we have a target temperature. |
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// Not having one is fatal. |
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|
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if (!have_target_temp) { |
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sprintf( painCave.errMsg, |
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"NPTi error: You can't use the NPTi integrator\n" |
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" without a targetTemp!\n" |
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); |
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painCave.isFatal = 1; |
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simError(); |
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return -1; |
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} |
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|
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if (!have_target_pressure) { |
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sprintf( painCave.errMsg, |
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"NPTi error: You can't use the NPTi integrator\n" |
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" without a targetPressure!\n" |
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); |
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painCave.isFatal = 1; |
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simError(); |
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return -1; |
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} |
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|
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// We must set tauThermostat. |
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|
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if (!have_tau_thermostat) { |
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sprintf( painCave.errMsg, |
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"NPTi error: If you use the NPTi\n" |
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" integrator, you must set tauThermostat.\n"); |
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painCave.isFatal = 1; |
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simError(); |
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return -1; |
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} |
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|
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// We must set tauBarostat. |
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|
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if (!have_tau_barostat) { |
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sprintf( painCave.errMsg, |
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"NPTi error: If you use the NPTi\n" |
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" integrator, you must set tauBarostat.\n"); |
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painCave.isFatal = 1; |
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simError(); |
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return -1; |
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} |
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|
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// We need NkBT a lot, so just set it here: |
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|
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NkBT = (double)info->ndf * kB * targetTemp; |
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|
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return 1; |
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} |
