Evolution of a Stratified Turbulent Cloud under Rotation

Li，Tianyi1,2; Wan，Minping1,3; Chen，Shiyi1,3,4

2023-10-01

10.3390/atmos14101590

Atmosphere   影响因子和分区

2073-4433

Localized turbulence is common in geophysical flows, where the roles of rotation and stratification are paramount. In this study, we investigate the evolution of a stratified turbulent cloud under rotation. Recognizing that a turbulent cloud is composed of vortices of varying scales and shapes, we start our investigation with a single eddy using analytical solutions derived from a linearized system. Compared to an eddy under pure rotation, the stratified eddy shows the physical manifestation of a known potential vorticity mode, appearing as a static stable vortex. In addition, the expected shift from inertial waves to inertial-gravity waves is observed. In our numerical simulations of the turbulent cloud, carried out at a constant Rossby number over a range of Froude numbers, stratification causes columnar structures to deviate from vertical alignment. This deviation increases with increasing stratification, slowing the expansion rate of the cloud. The observed characteristics of these columnar structures are consistent with the predictions of linear theory, particularly in their tilt angles and vertical growth rates, suggesting a significant influence of inertial-gravity waves. Using Lagrangian particle tracking, we have identified regions where wave activity dominates over turbulence. In scenarios of milder stratification, these inertial-gravity waves are responsible for a significant energy transfer away from the turbulent cloud, a phenomenon that attenuates with increasing stratification.

inertial-gravity waves localized turbulence rotation stratification

SCI ; EI

英语

第一 ; 通讯

Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences

Environmental Sciences ; Meteorology & Atmospheric Sciences

WOS:001119480900001

MDPI

20234414998897

Energy transfer ; Gravity waves ; Turbulence ; Vortex flow

Fluid Flow, General:631.1 ; Mechanics:931.1 ; Gravitation, Relativity and String Theory:931.5

2-s2.0-85175343218

Scopus

1.Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Physics and INFN,University of Rome “Tor Vergata”,Rome,Via della Ricerca Scientifica 1,00133,Italy
3.Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications,Southern University of Science and Technology,Shenzhen,518055,China
4.Eastern Institute for Advanced Study,Ningbo,315201,China

Li，Tianyi,Wan，Minping,Chen，Shiyi. Evolution of a Stratified Turbulent Cloud under Rotation[J]. Atmosphere,2023,14(10).

Li，Tianyi,Wan，Minping,&Chen，Shiyi.(2023).Evolution of a Stratified Turbulent Cloud under Rotation.Atmosphere,14(10).

Li，Tianyi,et al."Evolution of a Stratified Turbulent Cloud under Rotation".Atmosphere 14.10(2023).