Abstract
We study the mixing and dissipation properties of the advection–diffusion equation with diffusivity \(0 < \kappa \ll 1\) and advection by a class of random velocity fields on \(\mathbb {T}^d\), \(d=\{2,3\}\), including solutions of the 2D Navier–Stokes equations forced by sufficiently regular-in-space, non-degenerate white-in-time noise. We prove that the solution almost surely mixes exponentially fast uniformly in the diffusivity \(\kappa \). Namely, that there is a deterministic, exponential rate (independent of \(\kappa \)) such that all mean-zero \(H^1\) initial data decays exponentially fast in \(H^{-1}\) at this rate with probability one. This implies almost-sure enhanced dissipation in \(L^2\). Specifically that there is a deterministic, uniform-in-\(\kappa \), exponential decay in \(L^2\) after time \(t > rsim \left| \log \kappa \right| \). Both the \(\mathcal {O}(\left| \log \kappa \right| )\) time-scale and the uniform-in-\(\kappa \) exponential mixing are optimal for Lipschitz velocity fields. This work is also a major step in our program on scalar mixing and Lagrangian chaos necessary for a rigorous proof of the Batchelor power spectrum of passive scalar turbulence.
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Notes
Equivalently, we can think of \((u_t, x_t^\kappa , v_t^\kappa )\) as evolving on the sphere bundle \(\mathbf{H}\times S \mathbb {T}^d\), where \(S \mathbb {T}^d \cong \mathbb {T}^d \times \mathbb {S}^{d-1}\). In this parametrization, \(v_t^\kappa \) evolves according to the random ODE
$$\begin{aligned} \dot{v}_t^\kappa = (1 - v_t^\kappa \otimes v_t^\kappa ) D u_t(x_t^\kappa ) v_t^\kappa \, . \end{aligned}$$
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This material is based upon work supported by the National Science Foundation under Award No’s DMS-1552826, RNMS-1107444, DMS-1604805 and DMS-1803481.
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Bedrossian, J., Blumenthal, A. & Punshon-Smith, S. Almost-sure enhanced dissipation and uniform-in-diffusivity exponential mixing for advection–diffusion by stochastic Navier–Stokes. Probab. Theory Relat. Fields 179, 777–834 (2021). https://doi.org/10.1007/s00440-020-01010-8
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DOI: https://doi.org/10.1007/s00440-020-01010-8