气候变化领域集成服务门户(CCPortal): Scalewise Return to Isotropy in Stratified Boundary Layer Flows

CCPortal

DOI	10.1029/2020JD032732
	Scalewise Return to Isotropy in Stratified Boundary Layer Flows
	Ayet A.; Katul G.G.; Bragg A.D.; Redelsperger J.L.
发表日期	2020
ISSN	2169897X
卷号	125 期号:16
英文摘要	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. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	boundary layer turbulence; return to isotropy; Rotta model; stratified turbulence; turbulence closure models
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185827
作者单位	Ifremer, CNRS, IRD, Univ. Brest/ Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France; LMD/IPSL, ENS, PSL Université, École Polytechnique, Institut Polytechnique de Paris, Sorbonne Université, CNRS, Paris, France; Nicholas School of the Environment, Duke University, Durham, NC, United States; Department of Civil and Environmental Engineering, Duke University, Durham, NC, United States
推荐引用方式 GB/T 7714	Ayet A.,Katul G.G.,Bragg A.D.,et al. Scalewise Return to Isotropy in Stratified Boundary Layer Flows[J],2020,125(16).
APA	Ayet A.,Katul G.G.,Bragg A.D.,&Redelsperger J.L..(2020).Scalewise Return to Isotropy in Stratified Boundary Layer Flows.Journal of Geophysical Research: Atmospheres,125(16).
MLA	Ayet A.,et al."Scalewise Return to Isotropy in Stratified Boundary Layer Flows".Journal of Geophysical Research: Atmospheres 125.16(2020).