src/integrators/NPTi.cpp

#include "NPTi.hpp"
#include "brains/SimInfo.hpp"
#include "brains/Thermo.hpp"
#include "integrators/IntegratorCreator.hpp"
#include "integrators/NPT.hpp"
#include "primitives/Molecule.hpp"
#include "utils/OOPSEConstant.hpp"
#include "utils/simError.h"

namespace oopse {

static IntegratorBuilder<NPTi>* NPTiCreator = new IntegratorBuilder<NPTi>("NPTi");

// Basic isotropic thermostating and barostating via the Melchionna
// modification of the Hoover algorithm:
//
//    Melchionna, S., Ciccotti, G., and Holian, B. L., 1993,
//       Molec. Phys., 78, 533.
//
//           and
//
//    Hoover, W. G., 1986, Phys. Rev. A, 34, 2499.

NPTi::NPTi ( SimInfo *info) : NPT(info){

}

void NPTi::evolveEtaA() {
    eta += dt2 * ( instaVol * (instaPress - targetPressure) /
         (OOPSEConstant::pressureConvert*NkBT*tb2));
    oldEta = eta;
}

void NPTi::evolveEtaB() {

    prevEta = eta;
    eta = oldEta + dt2 * ( instaVol * (instaPress - targetPressure) /
         (OOPSEConstant::pressureConvert*NkBT*tb2));
}

void NPTi::calcVelScale() {
    vScale = chi + eta;
}

void NPTi::getVelScaleA(Vector3d& sc, const Vector3d& vel) {
    sc = vel * vScale;
}

void NPTi::getVelScaleB(Vector3d& sc, int index ){
    sc = oldVel[index] * vScale;    
}


void NPTi::getPosScale(const Vector3d& pos, const Vector3d& COM,
                           int index, Vector3d& sc){
    /**@todo*/
    sc  = oldPos[index] + pos/2.0 -COM;
    sc *= eta;
}

void NPTi::scaleSimBox(){

    double scaleFactor;

    scaleFactor = exp(dt*eta);

    if ((scaleFactor > 1.1) || (scaleFactor < 0.9)) {
        sprintf( painCave.errMsg,
             "NPTi error: Attempting a Box scaling of more than 10 percent"
             " check your tauBarostat, as it is probably too small!\n"
             " eta = %lf, scaleFactor = %lf\n", eta, scaleFactor
             );
        painCave.isFatal = 1;
        simError();
    } else {
        Mat3x3d hmat = currentSnapshot_->getHmat();
        hmat *= scaleFactor;
        currentSnapshot_->setHmat(hmat);
    }

}

bool NPTi::etaConverged() {

    return ( fabs(prevEta - eta) <= etaTolerance );
}

double NPTi::calcConservedQuantity(){

    double conservedQuantity;
    double Energy;
    double thermostat_kinetic;
    double thermostat_potential;
    double barostat_kinetic;
    double barostat_potential;

    Energy =thermo.getTotalE();

    thermostat_kinetic = fkBT* tt2 * chi * chi / (2.0 * OOPSEConstant::energyConvert);

    thermostat_potential = fkBT* integralOfChidt / OOPSEConstant::energyConvert;


    barostat_kinetic = 3.0 * NkBT * tb2 * eta * eta /(2.0 * OOPSEConstant::energyConvert);

    barostat_potential = (targetPressure * thermo.getVolume() / OOPSEConstant::pressureConvert) /
        OOPSEConstant::energyConvert;

    conservedQuantity = Energy + thermostat_kinetic + thermostat_potential +
        barostat_kinetic + barostat_potential;

    return conservedQuantity;
}

void NPTi::loadEta() {
    Mat3x3d etaMat = currentSnapshot_->getEta();
    eta = etaMat(0,0);
    if (fabs(etaMat(1,1) - eta) >= oopse::epsilon || fabs(etaMat(1,1) - eta) >= oopse::epsilon || etaMat.isDiagonal()) {
        sprintf( painCave.errMsg,
                 "NPTi error: the diagonal elements of are eta matrix is not same or etaMat is not a diagonal matrix");
        painCave.isFatal = 1;
        simError();
    }
}

void NPTi::saveEta() {
    Mat3x3d etaMat(0.0);
    etaMat(0, 0) = eta;
    etaMat(1, 1) = eta;
    etaMat(2, 2) = eta;
    currentSnapshot_->setEta(etaMat);
}

}
Revision:	1865
Committed:	Tue Dec 7 05:12:41 2004 UTC (19 years, 9 months ago) by tim
File size:	3516 byte(s)
Log Message:	fix a bug in UseInitXSstate
#	User	Rev	Content
1	tim	1822	#include "NPTi.hpp"
2	tim	1492	#include "brains/SimInfo.hpp"
3			#include "brains/Thermo.hpp"
4	tim	1837	#include "integrators/IntegratorCreator.hpp"
5	tim	1822	#include "integrators/NPT.hpp"
6			#include "primitives/Molecule.hpp"
7			#include "utils/OOPSEConstant.hpp"
8	tim	1492	#include "utils/simError.h"
9	gezelter	1490
10	tim	1822	namespace oopse {
11	gezelter	1490
12	tim	1837	static IntegratorBuilder<NPTi>* NPTiCreator = new IntegratorBuilder<NPTi>("NPTi");
13
14	gezelter	1490	// Basic isotropic thermostating and barostating via the Melchionna
15			// modification of the Hoover algorithm:
16			//
17			// Melchionna, S., Ciccotti, G., and Holian, B. L., 1993,
18			// Molec. Phys., 78, 533.
19			//
20			// and
21			//
22			// Hoover, W. G., 1986, Phys. Rev. A, 34, 2499.
23
24	tim	1822	NPTi::NPTi ( SimInfo *info) : NPT(info){
25	gezelter	1490
26			}
27
28	tim	1774	void NPTi::evolveEtaA() {
29	tim	1822	eta += dt2 * ( instaVol * (instaPress - targetPressure) /
30			(OOPSEConstant::pressureConvertNkBTtb2));
31			oldEta = eta;
32	gezelter	1490	}
33
34	tim	1774	void NPTi::evolveEtaB() {
35	gezelter	1490
36	tim	1822	prevEta = eta;
37			eta = oldEta + dt2 * ( instaVol * (instaPress - targetPressure) /
38			(OOPSEConstant::pressureConvertNkBTtb2));
39	gezelter	1490	}
40
41	tim	1774	void NPTi::calcVelScale() {
42	tim	1822	vScale = chi + eta;
43	gezelter	1490	}
44
45	tim	1774	void NPTi::getVelScaleA(Vector3d& sc, const Vector3d& vel) {
46			sc = vel * vScale;
47	gezelter	1490	}
48
49	tim	1774	void NPTi::getVelScaleB(Vector3d& sc, int index ){
50			sc = oldVel[index] * vScale;
51	gezelter	1490	}
52
53
54	tim	1774	void NPTi::getPosScale(const Vector3d& pos, const Vector3d& COM,
55	tim	1822	int index, Vector3d& sc){
56	tim	1774	/*@todo/
57			sc = oldPos[index] + pos/2.0 -COM;
58			sc *= eta;
59	gezelter	1490	}
60
61	tim	1774	void NPTi::scaleSimBox(){
62	gezelter	1490
63	tim	1822	double scaleFactor;
64	gezelter	1490
65	tim	1822	scaleFactor = exp(dt*eta);
66	gezelter	1490
67	tim	1822	if ((scaleFactor > 1.1) \|\| (scaleFactor < 0.9)) {
68			sprintf( painCave.errMsg,
69	gezelter	1490	"NPTi error: Attempting a Box scaling of more than 10 percent"
70			" check your tauBarostat, as it is probably too small!\n"
71			" eta = %lf, scaleFactor = %lf\n", eta, scaleFactor
72			);
73	tim	1822	painCave.isFatal = 1;
74			simError();
75			} else {
76			Mat3x3d hmat = currentSnapshot_->getHmat();
77			hmat *= scaleFactor;
78			currentSnapshot_->setHmat(hmat);
79			}
80	gezelter	1490
81			}
82
83	tim	1774	bool NPTi::etaConverged() {
84	gezelter	1490
85	tim	1822	return ( fabs(prevEta - eta) <= etaTolerance );
86	gezelter	1490	}
87
88	tim	1774	double NPTi::calcConservedQuantity(){
89	gezelter	1490
90	tim	1822	double conservedQuantity;
91			double Energy;
92			double thermostat_kinetic;
93			double thermostat_potential;
94			double barostat_kinetic;
95			double barostat_potential;
96	gezelter	1490
97	tim	1822	Energy =thermo.getTotalE();
98	gezelter	1490
99	tim	1822	thermostat_kinetic = fkBT* tt2 * chi * chi / (2.0 * OOPSEConstant::energyConvert);
100	gezelter	1490
101	tim	1822	thermostat_potential = fkBT* integralOfChidt / OOPSEConstant::energyConvert;
102	gezelter	1490
103
104	tim	1822	barostat_kinetic = 3.0 * NkBT * tb2 * eta * eta /(2.0 * OOPSEConstant::energyConvert);
105	gezelter	1490
106	tim	1822	barostat_potential = (targetPressure * thermo.getVolume() / OOPSEConstant::pressureConvert) /
107			OOPSEConstant::energyConvert;
108	gezelter	1490
109	tim	1822	conservedQuantity = Energy + thermostat_kinetic + thermostat_potential +
110			barostat_kinetic + barostat_potential;
111	gezelter	1490
112	tim	1822	return conservedQuantity;
113	gezelter	1490	}
114
115	tim	1822	void NPTi::loadEta() {
116			Mat3x3d etaMat = currentSnapshot_->getEta();
117			eta = etaMat(0,0);
118			if (fabs(etaMat(1,1) - eta) >= oopse::epsilon \|\| fabs(etaMat(1,1) - eta) >= oopse::epsilon \|\| etaMat.isDiagonal()) {
119			sprintf( painCave.errMsg,
120			"NPTi error: the diagonal elements of are eta matrix is not same or etaMat is not a diagonal matrix");
121			painCave.isFatal = 1;
122			simError();
123			}
124			}
125
126			void NPTi::saveEta() {
127			Mat3x3d etaMat(0.0);
128			etaMat(0, 0) = eta;
129			etaMat(1, 1) = eta;
130			etaMat(2, 2) = eta;
131			currentSnapshot_->setEta(etaMat);
132			}
133
134			}