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• W1975323849 abstract "We tested a variety of molecular dynamics simulation strategies in long-duration (up to several nanoseconds) constant-temperature simulations of liquid water under periodic boundary conditions. Such long durations are necessary to achieve adequate conformational sampling in simulations of membrane assemblies and other large biomolecular systems. Under a variety of circumstances, serious artifacts arise in the form of spurious collective behavior that becomes obvious only after the simulation has gone at least several hundred picoseconds. The potential energy of the system drops and the system changes from a liquid to an icy or glassy state. The underlying cause is accumulated center-of-mass motion of the system, coupled with velocity rescaling associated with constant-temperature control. The velocity rescaling in the constant-temperature algorithm reduces the thermal velocity as the net center-of-mass velocity grows, effectively causing the kinetic energy of the system to drain from thermal motions into coordinated motions. We found that the incidence and magnitude of the underlying artifactual motion leading to the spurious transition is mediated by: choice of method for computing electrostatic interactions; choice of ensemble; size of the simulation cell; SHAKE tolerance; frequency of nonbonded pairlist updating; and closeness of coupling to the temperature bath. The appearance of the spurious transition can be avoided by periodically subtracting net center-of-mass motion during the dynamics, or by improving the accuracy of the simulation by means of tightening SHAKE tolerance and updating nonbonded pairlists every timestep. © 2000 John Wiley & Sons, Inc. J Comput Chem 21: 121–131, 2000" @default.
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• W1975323849 date "2000-01-30" @default.
• W1975323849 modified "2023-10-14" @default.
• W1975323849 title "Collective motion artifacts arising in long-duration molecular dynamics simulations" @default.
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• W1975323849 doi "https://doi.org/10.1002/(sici)1096-987x(20000130)21:2<121::aid-jcc4>3.0.co;2-w" @default.
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