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#include <math.h> |
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#include <iostream> |
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#include <stdlib.h> |
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#include "utils/simError.h" |
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#include "primitives/SRI.hpp" |
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#include "primitives/Atom.hpp" |
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GhostBend::GhostBend( Atom &a, Atom &b ){ |
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c_p_a = &a; |
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if( !b.isDirectional() ){ |
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// if atom b is not directional, then bad things will happen |
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sprintf( painCave.errMsg, |
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" Ghost Bend error: Atom # %d of type \"%s\" is not " |
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"directional.\n", |
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b.getIndex(), |
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b.getType() ); |
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painCave.isFatal = 1; |
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simError(); |
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} |
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atomB = ( DirectionalAtom* ) &b; |
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c_potential_E = 0.0; |
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} |
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void GhostBend::calc_forces(){ |
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double dx,dy,dz,gx,gy,gz,dx2,dy2,dz2,gx2,gy2,gz2; |
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double rij2, rkj2, riji2, rkji2, dot, denom, cosang, angl; |
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double sina2, sinai; |
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double comf2, comf3, comf4; |
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double dcsidx, dcsidy, dcsidz, dcskdx, dcskdy, dcskdz; |
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// double dcsjdx, dcsjdy, dcsjdz; |
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double dadxi, dadyi, dadzi; |
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double dadxk, dadyk, dadzk;//, dadxj, dadyj, dadzj; |
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double daxi, dayi, dazi, daxk, dayk, dazk, daxj, dayj, dazj; |
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double u[3]; |
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double aR[3], bR[3]; |
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double aF[3], bF[3], bTrq[3]; |
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c_p_a->getPos( aR ); |
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atomB->getPos( bR ); |
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dx = aR[0] - bR[0]; |
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dy = aR[1] - bR[1]; |
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dz = aR[2] - bR[2]; |
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atomB->getU(u); |
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gx = u[0]; |
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gy = u[1]; |
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gz = u[2]; |
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dx2 = dx * dx; |
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dy2 = dy * dy; |
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dz2 = dz * dz; |
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gx2 = gx * gx; |
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gy2 = gy * gy; |
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gz2 = gz * gz; |
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rij2 = dx2 + dy2 + dz2; |
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rkj2 = gx2 + gy2 + gz2; |
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riji2 = 1.0 / rij2; |
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rkji2 = 1.0 / rkj2; |
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dot = dx * gx + dy * gy + dz * gz; |
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denom = sqrt((riji2 * rkji2)); |
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cosang = dot * denom; |
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if(cosang > 1.0)cosang = 1.0; |
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if(cosang < -1.0) cosang = -1.0; |
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angl = acos(cosang); |
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angl = angl * 180.0 / M_PI; |
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sina2 = 1.0 - cosang*cosang; |
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if(fabs(sina2) < 1.0E-12 ) sina2 = 1.0E-12; |
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sinai = 1.0 / sqrt(sina2); |
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comf2 = cosang * riji2; |
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comf3 = cosang * rkji2; |
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comf4 = bend_force(angl); |
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dcsidx = gx*denom - comf2*dx; |
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dcsidy = gy*denom - comf2*dy; |
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dcsidz = gz*denom - comf2*dz; |
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dcskdx = dx*denom - comf3*gx; |
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dcskdy = dy*denom - comf3*gy; |
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dcskdz = dz*denom - comf3*gz; |
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// dcsjdx = -dcsidx - dcskdx; |
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// dcsjdy = -dcsidy - dcskdy; |
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// dcsjdz = -dcsidz - dcskdz; |
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dadxi = -sinai*dcsidx; |
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dadyi = -sinai*dcsidy; |
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dadzi = -sinai*dcsidz; |
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dadxk = -sinai*dcskdx; |
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dadyk = -sinai*dcskdy; |
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dadzk = -sinai*dcskdz; |
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// dadxj = -dadxi - dadxk; |
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// dadyj = -dadyi - dadyk; |
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// dadzj = -dadzi - dadzk; |
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daxi = comf4*dadxi; |
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dayi = comf4*dadyi; |
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dazi = comf4*dadzi; |
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daxk = comf4*dadxk; |
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dayk = comf4*dadyk; |
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dazk = comf4*dadzk; |
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daxj = -daxi - daxk; |
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dayj = -dayi - dayk; |
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dazj = -dazi - dazk; |
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aF[0] = daxi; |
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aF[1] = dayi; |
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aF[2] = dazi; |
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bF[0] = daxj + daxk; |
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bF[1] = dayj + dayk; |
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bF[2] = dazj + dazk; |
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bTrq[0] = gy*dazk - gz*dayk; |
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bTrq[1] = gz*daxk - gx*dazk; |
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bTrq[2] = gx*dayk - gy*daxk; |
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c_p_a->addFrc( aF ); |
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atomB->addFrc( bF ); |
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atomB->addTrq( bTrq ); |
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return; |
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} |
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void GhostBend::setConstants( double the_c1, double the_c2, double the_c3, |
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double the_Th0 ){ |
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c1 = the_c1; |
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c2 = the_c2; |
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c3 = the_c3; |
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theta0 = the_Th0; |
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} |
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double GhostBend::bend_force( double theta ){ |
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double dt, dt2; |
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double force; |
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dt = ( theta - theta0 ) * M_PI / 180.0; |
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dt2 = dt * dt; |
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c_potential_E = ( c1 * dt2 ) + ( c2 * dt ) + c3; |
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force = -( ( 2.0 * c1 * dt ) + c2 ); |
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return force; |
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} |
