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#include <cmath> |
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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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double sc[3]; |
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double eta2ij; |
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double press[3][3], vScale[3][3], hm[3][3], hmnew[3][3], scaleMat[3][3]; |
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double bigScale, smallScale, offDiagMax; |
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tt2 = tauThermostat * tauThermostat; |
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tb2 = tauBarostat * tauBarostat; |
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for (j = 0; j < 3; j++ ) |
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pos[j] += dt * (vel[j] + sc[j]); |
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atoms[i]->setPos( pos ); |
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if( atoms[i]->isDirectional() ){ |
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// Use a taylor expansion for eta products: Hmat = Hmat . exp(dt * etaMat) |
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// Hmat = Hmat . ( Ident + dt * etaMat + dt^2 * etaMat*etaMat / 2) |
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bigScale = 1.0; |
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smallScale = 1.0; |
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offDiagMax = 0.0; |
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for(i=0; i<3; i++){ |
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for(j=0; j<3; j++){ |
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if (i == j) scaleMat[i][j] = 1.0; |
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// Taylor expansion for the exponential truncated at second order: |
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scaleMat[i][j] += dt*eta[i][j] + 0.5*dt*dt*eta2ij; |
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if (i != j) |
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if (fabs(scaleMat[i][j]) > offDiagMax) |
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offDiagMax = fabs(scaleMat[i][j]); |
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} |
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if (scaleMat[i][i] > bigScale) bigScale = scaleMat[i][i]; |
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if (scaleMat[i][i] < smallScale) smallScale = scaleMat[i][i]; |
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} |
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info->getBoxM(hm); |
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info->matMul3(hm, scaleMat, hmnew); |
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info->setBoxM(hmnew); |
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if ((bigScale > 1.1) || (smallScale < 0.9)) { |
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sprintf( painCave.errMsg, |
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"NPTf error: Attempting a Box scaling of more than 10 percent.\n" |
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" Check your tauBarostat, as it is probably too small!\n\n" |
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" scaleMat = [%lf\t%lf\t%lf]\n" |
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" [%lf\t%lf\t%lf]\n" |
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" [%lf\t%lf\t%lf]\n", |
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scaleMat[0][0],scaleMat[0][1],scaleMat[0][2], |
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scaleMat[1][0],scaleMat[1][1],scaleMat[1][2], |
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scaleMat[2][0],scaleMat[2][1],scaleMat[2][2]); |
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painCave.isFatal = 1; |
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simError(); |
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} else if (offDiagMax > 0.1) { |
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sprintf( painCave.errMsg, |
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"NPTf error: Attempting an off-diagonal Box scaling of more than 10 percent.\n" |
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" Check your tauBarostat, as it is probably too small!\n\n" |
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" scaleMat = [%lf\t%lf\t%lf]\n" |
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" [%lf\t%lf\t%lf]\n" |
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" [%lf\t%lf\t%lf]\n", |
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scaleMat[0][0],scaleMat[0][1],scaleMat[0][2], |
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scaleMat[1][0],scaleMat[1][1],scaleMat[1][2], |
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scaleMat[2][0],scaleMat[2][1],scaleMat[2][2]); |
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painCave.isFatal = 1; |
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simError(); |
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} else { |
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info->getBoxM(hm); |
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info->matMul3(hm, scaleMat, hmnew); |
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info->setBoxM(hmnew); |
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} |
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} |
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