Videos

Spontaneous Stochasticity and Anomalous Dissipation

Presenter
October 3, 2014
Abstract
Gregory Eyink Johns Hopkins University I will review the notions of anomalous dissipation and spontaneous stochasticity in turbulence and discuss their relations. Briefly, anomalous dissipation corresponds to the well-known "zeroth-law of turbulence", or non-vanishing energy dissipation in the inviscid limit. Spontaneous stochasticity is the statement that Lagrangian particle trajectories for fixed initial particle locations and for a fixed flow velocity are intrinsically random in the same limit ("God plays dice for classical dynamics too"). Relations between the two phenomena are known for turbulent scalar advection, since the late 20th-century work on the Kraichnan model. I present new results (with T. Drivas) for the Burgers model, which demonstrate similar relations there. I finally discuss Navier-Stokes turbulence, stating the results known, open questions, and some conjectures.