# Energy Transfer from Large to Small Scales in Turbulence by Multiscale Nonlinear Strain and Vorticity Interactions.

@article{Johnson2020EnergyTF, title={Energy Transfer from Large to Small Scales in Turbulence by Multiscale Nonlinear Strain and Vorticity Interactions.}, author={Perry L. Johnson}, journal={Physical review letters}, year={2020}, volume={124 10}, pages={ 104501 } }

An intrinsic feature of turbulent flows is an enhanced rate of mixing and kinetic energy dissipation due to the rapid generation of small-scale motions from large-scale excitation. The transfer of kinetic energy from large to small scales is commonly attributed to the stretching of vorticity by the strain rate, but strain self-amplification also plays a role. Previous treatments of this connection are phenomenological or inexact, or cannot distinguish the contribution of vorticity stretching…

## 26 Citations

On the role of vorticity stretching and strain self-amplification in the turbulence energy cascade

- Physics, Environmental ScienceJournal of Fluid Mechanics
- 2021

Abstract The tendency of turbulent flows to produce fine-scale motions from large-scale energy injection is often viewed as a scale-wise cascade of kinetic energy driven by vorticity stretching. This…

Scale-dependent anisotropy, energy transfer and intermittency in bubble-laden turbulent flows

- PhysicsJournal of Fluid Mechanics
- 2021

Abstract Data from direct numerical simulations of disperse bubbly flows in a vertical channel are used to study the effect of the bubbles on the carrier-phase turbulence. We developed a new method,…

The energy cascade as the origin of intense events in small-scale turbulence

- Physics, Environmental ScienceJournal of Fluid Mechanics
- 2022

Abstract This work presents evidence of the relation between the dynamics of intense events in the dissipative range of turbulence and the energy cascade. The generalised (Hölder) means are used to…

Gabor mode enrichment in large eddy simulations of turbulent flow

- Environmental Science, PhysicsJournal of Fluid Mechanics
- 2020

Abstract A turbulence enrichment model for subfilter-scale motions in large eddy simulations (LES) is comprehensively evaluated in the context of a posteriori analysis. The paper further develops the…

Subgrid-scale models of isotropic turbulence need not produce energy backscatter

- Environmental Science, PhysicsJournal of Fluid Mechanics
- 2022

Abstract This investigation questions the importance of inverse interscale energy fluxes, the so-called energy backscatter, for the modelling of the energy cascade in large-eddy simulations (LES) of…

Turbulence and heat transfer on a rotating, heated half soap bubble

- Physics, Environmental ScienceJournal of Fluid Mechanics
- 2021

Abstract We use direct numerical simulations to study the two-dimensional flow of a rotating, half soap bubble that is heated at its equator. The heating produces buoyancy and rotation generates…

Temporal dynamics of the alignment of the turbulent stress and strain rate

- Physics, Engineering
- 2020

Energy transfer between scales in the turbulent cascade requires geometric alignment between scale-dependent turbulent stresses and strain rates. However, each of these tensors evolves dynamically…

A physics-inspired alternative to spatial filtering for large-eddy simulations of turbulent flows

- PhysicsJournal of Fluid Mechanics
- 2022

Abstract Large-eddy simulations (LES) are widely used for computing high Reynolds number turbulent flows. Spatial filtering theory for LES is not without its shortcomings, including how to define…

Lagrangian dynamics of the tensor diffusivity model for turbulent subfilter stresses

- Environmental Science
- 2021

Large-eddy simulations (LES) are most often considered attempts to numerically approximate the solution to the filtered Navier-Stokes equations (Leonard 1974; Meneveau & Katz 2000; Sagaut 2006). LES…

Hydrodynamic interactions and extreme particle clustering in turbulence

- PhysicsJournal of Fluid Mechanics
- 2021

Abstract Expanding recent observations by Hammond & Meng (J. Fluid Mech., vol. 921, 2021, A16), we present a range of detailed experimental data of the radial distribution function (r.d.f.) of…

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