For inhomogeneous systems with interfaces, the inclusion of long-range dispersion interactions is necessary to achieve consistency between molecular simulation calculations and experimental results. For accurate and efficient incorporation of these contributions, we have implemented a particle-particle particle-mesh Ewald solver for dispersion (r−6) interactions into the LAMMPSmolecular dynamics package. We demonstrate that the solver's

$\mathcal {O}(N\log N)$
O(NlogN) scaling behavior allows its application to large-scale simulations. We carefully determine a set of parameters for the solver that provides accurate results and efficient computation. We perform a series of simulations with Lennard-Jones particles, SPC/E water, and hexane to show that with our choice of parameters the dependence of physical results on the chosen cutoff radius is removed. Physical results and computation time of these simulations are compared to results obtained using either a plain cutoff or a traditional Ewald sum for dispersion.

Topics
Molecular simulations, Molecular dynamics, Ewald summation, Particle-particle-particle-mesh, Electrostatics, Fourier analysis, Interatomic potentials, Optical fibers, Crystal lattices, Proteins
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© 2012 American Institute of Physics.
2012
American Institute of Physics

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