A toy model of turbulent shear flow using vortons

TL;DR

This paper presents a simplified toy model for turbulent shear flow using vortons, capturing key features of turbulence such as regime transitions and dissipation scaling with Reynolds number.

Contribution

The novel model introduces vortons as key structures to simulate shear flow turbulence, highlighting regime transitions and dissipation mechanisms.

Findings

Model exhibits laminar and turbulent regimes with distinct dissipation sources.

Dissipation and Grashof number scale with Reynolds number following power laws.

Captures essential turbulence features with a highly sparse, structure-focused approach.

Abstract

We introduce a novel toy model for shear flows, exploiting the spatial intermittency and the scale separation between large-scale flows and small-scale structures. The model is highly sparse, focusing exclusively on the most intense structures, which are represented by vortons: dynamically regularized quasi-singularities that experience rapid distortion from the large-scale shear. The vortons, in turn, influence the large-scale flow through the sub-grid stress tensor. Despite its simplicity, the model displays an interesting transition between two distinct regimes: (i) a laminar regime, where dissipation is entirely attributed to the large-scale flow, and the vortons dynamics is essentially diffusive, and (ii) a turbulent regime, in which most of the dissipation arises from the vortons. These regimes correspond to different scalings of dissipation and the Grashof number as functions of the Reynolds number, with power-law relationships that resemble those observed in classical turbulence.