Kubo formulas for dispersion in heterogeneous periodic nonequilibrium systems

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
T Guérin, David S Dean

Abstract

We consider the dispersion properties of tracer particles moving in nonequilibrium heterogeneous periodic media. The tracer motion is described by a Fokker-Planck equation with arbitrary spatially periodic (but constant in time) local diffusion tensors and drifts, eventually with the presence of obstacles. We derive a Kubo-like formula for the time-dependent effective diffusion tensor valid in any dimension. From this general formula, we derive expressions for the late time effective diffusion tensor and drift in these systems. In addition, we find an explicit formula for the late finite-time corrections to these transport coefficients. In one dimension, we give a closed analytical formula for the transport coefficients. The formulas derived here are very general and provide a straightforward method to compute the dispersion properties in arbitrary nonequilibrium periodic advection-diffusion systems.

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Citations

Oct 4, 2018·The Journal of Chemical Physics·M MangeatD S Dean
Jun 20, 2019·Physical Review. E·Matthieu MangeatDavid S Dean
Jun 24, 2020·The Journal of Chemical Physics·M MangeatD S Dean

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