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Wei Jiang, David Hardy, James Phillips, Alex MacKerell, Klaus Schulten, and Benoit Roux. High-performance scalable molecular dynamics simulations of a polarizable force field based on classical Drude oscillators in NAMD. Journal of Physical Chemistry Letters, 2:87-92, 2011.

JIAN2011 Incorporating the influence of induced polarization in large-scale atomistic molecular dynamics (MD) simulations is a critical challenge in the progress toward computations of increased fidelity. One computationally efficient treatment is based on the classical Drude oscillator in which an auxiliary charged particle is attached by a spring to each nucleus. Here, we report the first implementation based on this model in the MD simulation program NAMD. An extended Lagrangian dynamics with a dual-Langevin thermostat scheme applied to the Drude-nucleus pairs is employed to efficiently generate classical dynamic propagation near the self-consistent field limit. To validate and evaluate the performance of NAMD, structural and transport properties were characterized for a series of systems. Excellent agreement with experiments and previous simulations are obtained. It is shown that large-scale MD simulations based on the Drude polarizable force field scale very well on massively distributed supercomputing platforms. The cost of simulations based on the Drude model is only $50\%$-$100\%$ higher than those based on nonpolarizable models.


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