中文版 | English
Title

Large-scale coherent structure and canopy-level turbulence in the convective boundary layer over urban areas

Author
Corresponding AuthorWan,Minping
Publication Years
2023-10-01
DOI
Source Title
ISSN
0360-1323
EISSN
1873-684X
Volume244
Abstract
Thermally unstable stratification alters the winds over urban areas and excites organized, large-scale motions (LSMs) in the atmospheric boundary layer (ABL). The current understanding of the interaction between urban turbulence and buoyancy-induced coherent structures is rather limited due to their multiscale, multiphysics nature. Nine sets of large-eddy simulation (LES) are performed to critically examine the influence of atmospheric instability on turbulent boundary layers (TBLs) interacting with idealized urban roughness elements. Varying the stratification from neutral to almost free convective conditions enables the coherent structures to transit from horizontal rolls to open cellular patterns. The aerodynamic roughness parameters tend to decrease in more unstable stratification, potentially a result of buoyancy effects that might enhance organized ejections and suppress energetic sweeps within the roughness sublayers (RSLs). Unexpectedly, roughness-induced sweeps dominate the vertical momentum fluxes within urban canopies even under the most convective condition. However, decoupling the momentum and heat transports in highly convective states results in a subtle influence of urban roughness on the vertical heat fluxes therein. The spatial distribution of canopy-level turbulent momentum fluxes is found to be strongly modulated by the overlying large-scale coherent structures. The modulation is enhanced with increasing instability. In addition, urban-like surfaces elevate the large-scale rolls and assist them in forming under a weaker stratification than in canonical settings.
Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
First ; Corresponding
Funding Project
National Natural Science Foundation of China[12225204];Guangdong Science and Technology Department[2019B21203001];Guangdong Science and Technology Department[2020B1212030001];
WOS Research Area
Construction & Building Technology ; Engineering
WOS Subject
Construction & Building Technology ; Engineering, Environmental ; Engineering, Civil
WOS Accession No
WOS:001076996500001
Publisher
ESI Research Field
ENGINEERING
Scopus EID
2-s2.0-85170066774
Data Source
Scopus
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/559553
DepartmentDepartment of Mechanics and Aerospace Engineering
Affiliation
1.Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,China
2.Department of Mechanical Engineering,The University of Hong Kong,7/F, Haking Wong Building, Pokfulam Road,Hong Kong
First Author AffilicationDepartment of Mechanics and Aerospace Engineering
Corresponding Author AffilicationDepartment of Mechanics and Aerospace Engineering
First Author's First AffilicationDepartment of Mechanics and Aerospace Engineering
Recommended Citation
GB/T 7714
Zhou,Kangcheng,Liu,Chun Ho,Wan,Minping. Large-scale coherent structure and canopy-level turbulence in the convective boundary layer over urban areas[J]. Building and Environment,2023,244.
APA
Zhou,Kangcheng,Liu,Chun Ho,&Wan,Minping.(2023).Large-scale coherent structure and canopy-level turbulence in the convective boundary layer over urban areas.Building and Environment,244.
MLA
Zhou,Kangcheng,et al."Large-scale coherent structure and canopy-level turbulence in the convective boundary layer over urban areas".Building and Environment 244(2023).
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