Abstract
Non-equilibrium molecular dynamics simulations, of crucial importance in sliding friction, are hampered by arbitrariness and uncertainties in the removal of the frictionally generated Joule heat. Building upon general pre-existing formulation, we implement a fully microscopic dissipation approach which, based on a parameter-free, non-Markovian, stochastic dynamics, absorbs Joule heat equivalently to a semi-infinite solid, and harmonic substrate. As a test case, we investigate the stick–slip friction of a slider over a two-dimensional Lennard-Jones solid, comparing our virtually exact frictional results with approximate ones from commonly adopted dissipation schemes. Remarkably, the exact results can be closely reproduced by a standard Langevin dissipation scheme, once its parameters are determined according to a general and self-standing variational procedure.
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Notes
The correlated random noise sequence, to be applied to the boundary layer atoms, has been generated at the beginning of the simulation using the rules (15). If we have to correlate in time a single random number sequence, we can generate a set of uncorrelated numbers in Fourier space, multiply them by the Fourier transform of the correlation matrix and make the inverse transform to get back to the real space [19].
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Acknowledgments
A discussion with L. Kantorovich is gratefully acknowledged. This study is part of Eurocores Projects FANAS/AFRI, sponsored by the Italian Research Council (CNR), and of FANAS/ACOF. It is also sponsored by the Italian PRIN Contracts No. 20087NX9Y7 and No. 2008Y2P573, and by the Swiss National Science Foundation SINERGIA Project CRSII2 136287\ 1.
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Benassi, A., Vanossi, A., Santoro, G.E. et al. Optimal Energy Dissipation in Sliding Friction Simulations. Tribol Lett 48, 41–49 (2012). https://doi.org/10.1007/s11249-012-9936-5
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DOI: https://doi.org/10.1007/s11249-012-9936-5