Thermal fluctuations in the dissipation range of homogeneous isotropic turbulence

Authors

John B. Bell, Lawrence Berkeley National Laboratory
Andrew Nonaka, Lawrence Berkeley National Laboratory
Alejandro L. Garcia, San Jose State UniversityFollow
Gregory Eyink, Johns Hopkins University

Publication Date

5-25-2022

Document Type

Article

Publication Title

Journal of Fluid Mechanics

Volume

939

DOI

10.1017/jfm.2022.188

Abstract

Using fluctuating hydrodynamics we investigate the effect of thermal fluctuations in the dissipation range of homogeneous isotropic turbulence. Simulations confirm theoretical predictions that the energy spectrum is dominated by these fluctuations at length scales comparable to the Kolmogorov length. We also find that the extreme intermittency in the far-dissipation range predicted by Kraichnan is replaced by Gaussian thermal equipartition.

Funding Number

MPS-663054

Funding Sponsor

U.S. Department of Energy

Keywords

homogeneous turbulence, isotropic turbulence, turbulence simulation

Department

Physics and Astronomy

Recommended Citation

John B. Bell, Andrew Nonaka, Alejandro L. Garcia, and Gregory Eyink. "Thermal fluctuations in the dissipation range of homogeneous isotropic turbulence" Journal of Fluid Mechanics (2022). https://doi.org/10.1017/jfm.2022.188