Article
Construction & Building Technology
Xiaojun Ma, Yu Zhao, Xueying Wen, Jiujiu Chen
Summary: Creating a safe and comfortable outdoor building environment is a key issue in architectural design and regional planning. This paper introduces a compact wind tunnel platform that uses grids with unequal spacing to measure and study the wind environment around buildings. Compared with traditional wind tunnels, this compact wind tunnel is more flexible, convenient, and cost-effective. It has applicability in predicting and evaluating the outdoor wind environment around buildings.
Article
Meteorology & Atmospheric Sciences
Mostafa Momen
Summary: Baroclinicity significantly impacts stable atmospheric boundary layers by altering Ekman spiral shape and low-level jet height. It influences friction velocity, Obukhov length, shear production, and ABL height in weakly stable ABLs, but these variables converge to a constant asymptote as stability increases, regardless of baroclinicity regime. Strong turbulence destruction in very stable ABLs leads to decoupling of the surface from higher elevations, where baroclinicity effect is more pronounced.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2022)
Article
Construction & Building Technology
Dongpeng Guo, Fan Yang, Xuefeng Shi, Yunpeng Li, Rrentai Yao
Summary: The study utilized a renormalization group k-epsilon turbulence model to investigate the impact of a cubic building on flow structure and pollutant dispersion under different bulk Richardson numbers. The results of the computational fluid dynamics numerical simulation matched well with wind tunnel experiment results. As Rib increased, changes in the length of the windward cavity zone of the building were observed, with the flow field transitioning from dominant turbulent convection to laminar flow. Different stable stratifications had varying effects on pollutant diffusion near the building.
BUILDING AND ENVIRONMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Philip E. Hancock, Paul Hayden
Summary: Two cases of an overlying inversion imposed on a stable boundary layer are studied, showing horizontally homogeneous behavior over a streamwise fetch of more than eight boundary-layer heights, while the behavior of temperature and velocity in the lower portion of the boundary layer is more complex.
BOUNDARY-LAYER METEOROLOGY
(2021)
Article
Engineering, Civil
Bin Lu, Qiu-Sheng Li
Summary: This study reproduces a realistic one-thousand-meter height atmospheric boundary layer with wind veering phenomenon and examines the effects of the Coriolis force and terrain type on wind and turbulence characteristics. Results show that the Coriolis effect varies in three orthogonal directions, with a more significant impact on turbulence integral length scale in the streamwise direction.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Editorial Material
Mechanics
Nicholas J. Cook
Summary: This paper highlights the replication of an outdated method in a recent publication without proper acknowledgment, making it unworthy of publication in 2020.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2021)
Article
Construction & Building Technology
Gregory A. Kopp
Summary: This paper reviews and discusses the substantive changes to the ASCE 49-21 Standard, focusing on wind field simulations and wind load requirements. The modifications aim to ease the precise scaling requirements for flow simulations and propose research needs for aerodynamic mechanisms.
WIND AND STRUCTURES
(2023)
Review
Green & Sustainable Science & Technology
C. Perez Albornoz, M. A. Escalante Soberanis, V Ramirez Rivera, M. Rivero
Summary: Wind energy has experienced significant growth, thanks to the development of wind turbines and tall wind masts. Atmospheric stability plays a crucial role in the wind energy industry, impacting wind profile, energy production, and wake effects.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Mechanics
Mohamed Arif Mohamed, David Wood, Bing Feng Ng
Summary: In this study, an activated curvature production term was considered to describe turbulent flow over two-dimensional hills. The new term, referred to as the SR modification, depends on the difference between strain rate and rotation. It was compared to different turbulence models, and the Kato-Launder model showed the best overall predictions for various flow properties. The SR model was slightly less accurate but uniquely predicted flow separation and re-attachment in specific locations.
Article
Multidisciplinary Sciences
Luoqin Liu, Richard J. A. M. Stevens
Summary: Studying the flow structure in conventionally neutral atmospheric boundary layers is important for improving weather and climate forecast models, as well as for applications in the wind industry. This research introduces an innovative model based on the Ekman equations and the universal potential temperature flux profile, which accurately describes the vertical profiles of wind speed and shear stress, capturing features like wind veer profiles.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Jiadong Zeng, Zhitian Zhang, Mingshui Li, Zhiguo Li
Summary: This study investigated the spatial structure of large-scale boundary layer turbulence simulated by a wind tunnel, proposing improved coherence models based on experimental results. The passively simulated atmospheric turbulence was found to conform to isotropic turbulence assumption on the horizontal plane, but the interference of nonisotropic turbulence components cannot be ignored.
APPLIED SCIENCES-BASEL
(2021)
Article
Environmental Sciences
Dong Xie, Peilin Xiao, Ninghua Cai, Lixin Sang, Xiumin Dou, Hanqing Wang
Summary: In this study, a field tracing experiment was conducted to investigate the dispersion of pollutants from a nuclear power plant under neutral stratification weather conditions with a main wind direction of SSW. Based on this, a wind tunnel experiment was conducted to create a wind speed profile and turbulence intensity profile consistent with the site. The results showed that the wind tunnel tracer experiment had the same diffusion trend as the field experiment, validating the accuracy of the flow field.
Article
Green & Sustainable Science & Technology
Luoqin Liu, Richard J. A. M. Stevens
Summary: The impact of thermal stratification on wind turbine wakes in complex terrain was studied using large eddy simulations. Results showed that a hill wake significantly reduced power production of a downstream turbine in a convective boundary layer, but surprisingly increased power production in a stable boundary layer. This increase was attributed to enhanced mixing induced by the hill wake, leading to entrainment of kinetic energy from a low-level jet.
Article
Construction & Building Technology
Danijel Bosnar, Hrvoje Kozmar, Stanislav Pospisil, Michael Machacek
Summary: The study found that wind turbines experience significantly higher aerodynamic loads at high tip speed ratios and yaw angles, but these loads can be reduced by adjusting the pitch angle of the rotor blades and yaw angle of the wind turbine tower.
WIND AND STRUCTURES
(2021)
Article
Energy & Fuels
P. Sosa-Flores, J. F. Hinojosa, R. L. Duran
Summary: This study investigates the impact of different geometric shapes on the load coefficients of heliostats in the stow position. The results demonstrate that the differences in shape and size proportions between the front and rear sections affect the load coefficients significantly.