Parameter-free dissipation in simulated sliding friction

Details Parameter-free dissipation in simulated sliding friction Parameter-free dissipation in simulated sliding friction

2010-08-06

arxiv.org/abs/1008.1711v1

Phys. Rev. B 82 (2010) 081401

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Non-equilibrium molecular dynamics simulations, of crucial importance in sliding friction, are hampered by arbitrariness and uncertainties in the way Joule heat is removed. We implement in a realistic frictional simulation a parameter-free, non-markovian, stochastic dynamics, which, as expected from theory, absorbs Joule heat precisely as a semi-infinite harmonic substrate would. Simulating stick-slip friction of a slider over a 2D Lennard-Jones solid, we compare our virtually exact frictional results with approximate ones from commonly adopted empirical dissipation schemes. While the latter are generally in serious error, we show that the exact results can be closely reproduced by a viscous Langevin dissipation at the boundary layer, once the back-reflected frictional energy is variationally optimized.

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