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!! Corresponds to the force field defined in lj_FF.cpp |
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!! @author Charles F. Vardeman II |
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!! @author Matthew Meineke |
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< |
!! @version $Id: calc_LJ_FF.F90,v 1.2 2003-04-04 22:22:30 chuckv Exp $, $Date: 2003-04-04 22:22:30 $, $Name: not supported by cvs2svn $, $Revision: 1.2 $ |
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!! @version $Id: calc_LJ_FF.F90,v 1.3 2003-04-08 22:38:43 chuckv Exp $, $Date: 2003-04-08 22:38:43 $, $Name: not supported by cvs2svn $, $Revision: 1.3 $ |
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module lj |
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use definitions |
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dudr = 24.0E0_DP * epsilon * (t6 - 2.0E0_DP*t12) / rij |
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drdx = -d(1) / rij |
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drdy = -d(2) / rij |
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drdz = -d(3) / rij |
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> |
drdx = d(1) / rij |
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> |
drdy = d(2) / rij |
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drdz = d(3) / rij |
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fx = dudr * drdx |
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fy = dudr * drdy |
