Assessment of Small-scale Anisotropy in Stably Stratified Turbulent Flows using Direct Numerical Simulations

Author

Amrapalli Garanaik
Subhas Karan Venayagamoorthy, Missouri University of Science and TechnologyFollow

Abstract

In this study, the validity of the widely used Kolmogorov hypothesis of local isotropy of dissipative scales in stably stratified turbulent flows is investigated using high-resolution direct numerical simulations. Departure from isotropy is investigated for the first time in terms of the turbulent Froude number defined as Fr = ϵ/(NEk), where N is the buoyancy frequency, Ek is the turbulent kinetic energy, and ϵ is the rate of dissipation of turbulent kinetic energy. It is shown that for both ϵ and the rate of scalar (density) dissipation, ϵρ, the small-scale statistics are nearly isotropic in the weakly stratified turbulent regime (Fr > 1). For strongly stable flows (Fr

Recommended Citation

A. Garanaik and S. K. Venayagamoorthy, "Assessment of Small-scale Anisotropy in Stably Stratified Turbulent Flows using Direct Numerical Simulations," Physics of Fluids, vol. 30, no. 12, article no. 126602, American Institute of Physics, Dec 2018.

The definitive version is available at https://doi.org/10.1063/1.5055871

Department(s)

Civil, Architectural and Environmental Engineering

Publication Status

Available Access

Comments

National Science Foundation, Grant OCE-1151838

International Standard Serial Number (ISSN)

1089-7666; 1070-6631

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2025 American Institute of Physics, All rights reserved.

Publication Date

01 Dec 2018