Theory and numerical simulation of heat transport in multi-component systems

Abstract

The thermal conductivity of classical multi-component fluids is seemingly affected by the intrinsic arbitrariness in the definition of the atomic energies and it is ill-conditioned numerically, when evaluated from the Green-Kubo theory of linear response. To cope with these two problems we introduce two new concepts: a convective invariance principle for transport coefficients, in the first case, and multi-variate cepstral analysis, in the second. A combination of these two concepts allows one to substantially reduce the noise affecting the estimate of the thermal conductivity from equilibrium molecular dynamics, even for one-component systems.

arXiv comment9 pages, 5 figures; revised text; supplemental material included

References in corpus (4)

• Microscopic theory and quantum simulation of atomic heat transport
• Central limit theorem for Fourier transforms of stationary processes
• Accurate thermal conductivities from optimally short molecular dynamics simulations
• Gauge invariance of thermal transport coefficients

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