Efficient simulation of multidimensional phonon transport using energy-based variance-reduced Monte Carlo formulations
Name
Peraud-2011-Efficient simulation of multidimensional phonon transport using.pdf
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Author(s)
Peraud, Jean-Philippe Michel
Hadjiconstantinou, Nicolas
Date Issued
November 2011
Journal
Physical Review B
Publisher
American Physical Society (APS)
Citation
Péraud, Jean-Philippe M., and Nicolas G. Hadjiconstantinou. “Efficient Simulation of Multidimensional Phonon Transport Using Energy-based Variance-reduced Monte Carlo Formulations.” Physical Review B 84.20 (2011): n. pag. Web. 2 Mar. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
We present a Monte Carlo method for obtaining solutions of the Boltzmann equation to describe phonon transport in micro- and nanoscale devices. The proposed method can resolve arbitrarily small signals (e.g., temperature differences) at small constant cost and thus represents a considerable improvement compared to traditional Monte Carlo methods, whose cost increases quadratically with decreasing signal. This is achieved via a control-variate variance-reduction formulation in which the stochastic particle description solves only for the deviation from a nearby equilibrium, while the latter is described analytically. We also show that simulation of an energy-based Boltzmann equation results in an algorithm that lends itself naturally to exact energy conservation, thereby considerably improving the simulation fidelity. Simulations using the proposed method are used to investigate the effect of porosity on the effective thermal conductivity of silicon. We also present simulations of a recently developed thermal conductivity spectroscopy process. The latter simulations demonstrate how the computational gains introduced by the proposed method enable the simulation of otherwise intractable multiscale phenomena.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.84.205331
