Scalewise Return to Isotropy in Stratified Boundary Layer Flows


Journal Article

© 2020. American Geophysical Union. All Rights Reserved. Anisotropic turbulence is ubiquitous in atmospheric and oceanic boundary layers due to differences in energy injection mechanisms. Unlike mechanical production that injects energy in the streamwise velocity component, buoyancy affects only the vertical velocity component. This anisotropy in energy sources, quantified by the flux Richardson number Rif, is compensated by a “return to isotropy” (RTI) tendency of turbulent flows. Describing RTI in Reynolds-averaged models and across scales continues to be a challenge in stratified turbulent flows. Using phenomenological models for spectral energy transfers, the necessary conditions for which the widely-used Rotta model captures RTI across various Rif and eddy sizes are discussed for the first time. This work unravels adjustments to the Rotta constant, with Rif and scale, necessary to obtain consistency between RTI models and the measured properties of the atmospheric surface layer for planar-homogeneous and stationary flows in the absence of subsidence. A range of Rif and eddy sizes where the usage of a conventional Rotta model is prohibited is also found. Those adjustments lay the groundwork for new closure schemes.

Full Text

Duke Authors

Cited Authors

  • Ayet, A; Katul, GG; Bragg, AD; Redelsperger, JL

Published Date

  • August 27, 2020

Published In

Volume / Issue

  • 125 / 16

Electronic International Standard Serial Number (EISSN)

  • 2169-8996

International Standard Serial Number (ISSN)

  • 2169-897X

Digital Object Identifier (DOI)

  • 10.1029/2020JD032732

Citation Source

  • Scopus