Journal of Wind Engineering and Industrial Aerodynamics最新文献

{"title":"Numerical investigation into the mechanism of dust deposition on photovoltaic panels in the presence of an electrostatic dust barrier","authors":"Xiaohong Yan","doi":"10.1016/j.jweia.2025.106071","DOIUrl":"10.1016/j.jweia.2025.106071","url":null,"abstract":"<div><div>The suppression of long-term suspended particle deposition remains a challenging problem. A strategy is proposed to suppress dust deposition by numerically predicting particle deposition behavior using the Eulerian-Lagrangian method. It has been observed that the deposition ratio increases with increasing ratio of gravity to drag force when an electrostatic barrier is not installed. However, when an electrostatic barrier is in place, particles are captured through both inertial and electrostatic mechanisms. The capture ratio of the electrostatic barrier increases with an increasing contribution of Coulomb force. The electrostatic mechanism results in a maximum enhancement of the capture ratio by about 50%. Additionally, the electrostatic barrier generates an air stream with low dust concentration, which effectively suppresses the dust deposition on the downstream PV panel under drag-force-dominant conditions. As a result, the surface dust concentration and the conversion efficiency loss of the PV panel can be maximally suppressed by about 90%.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"261 ","pages":"Article 106071"},"PeriodicalIF":4.2,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of levitation bogie structure aerodynamic loads on the dynamic performance of 600 km/h EMS maglev train","authors":"Yang Feng ,&nbsp;Chunfa Zhao ,&nbsp;Yeye Peng ,&nbsp;Wenzhao Zhang ,&nbsp;Dalian Yu ,&nbsp;Xin Liang","doi":"10.1016/j.jweia.2025.106070","DOIUrl":"10.1016/j.jweia.2025.106070","url":null,"abstract":"<div><div>As the operating speed of EMS high-speed maglev trains increases to 600 km/h, aerodynamic effects significantly impact running safety and stability. However, most studies considering aerodynamic loads by applying them to the carbody's mass center, overlooking the aerodynamic loads effects on bogie structures, such as skirt boards and levitation/guiding electromagnets. This study examines the dynamic performance of a Chinese 600 km/h maglev train. An aerodynamic model of a three-car trainset was developed to simulate running conditions at 600 km/h, both in open-line and tunnel scenarios. Aerodynamic loads on skirt boards, levitation, and guidance electromagnets were innovatively analyzed and applied to a maglev train dynamics model considering the skirt board. The findings reveal that aerodynamic loads on the levitation bogie at the train's front and rear are most significant, with lift and lateral forces posing potential running safety risks. During open-line operation, these loads exert minimal impact. However, in tunnels running condition, significant fluctuations occur during entry and pressure wave interactions, increasing dynamic responses and potentially compromising safety and levitation stability, and even bring levitation instability problem.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"261 ","pages":"Article 106070"},"PeriodicalIF":4.2,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modulating higher-order statistics of turbulent boundary layer wind fields using randomized grid roughness","authors":"Mariel Ojeda-Tuz ,&nbsp;Mohit Chauhan ,&nbsp;Pedro Fernández-Cabán ,&nbsp;Ryan Catarelli ,&nbsp;Michael Shields ,&nbsp;Kurtis Gurley","doi":"10.1016/j.jweia.2025.106042","DOIUrl":"10.1016/j.jweia.2025.106042","url":null,"abstract":"<div><div>Near ground wind velocity observations and wind tunnel measurements have identified height dependent non-Gaussian behavior in longitudinal wind turbulence. The potential sensitivity of bluff body peak pressure loads to non-Gaussian turbulence motivates an investigation to modulate longitudinal skewness in the approach flow through passive mechanical turbulence generation. It is currently an open question as to whether higher-order properties of turbulence can be modulated via roughness element grid. This research leverages outcomes from a recent active machine learning experimental study to modulate turbulence profiles in a boundary layer wind tunnel using an automated roughness grid. Reynolds stress fraction analyses of turbulence data from hundreds of non-homogeneous roughness configurations are related to the observed along wind turbulence skewness profile. The results identify a relationship between roughness element configuration features and resultant skewness profiles, providing insights into modulating higher-order longitudinal turbulence behavior in boundary layer wind simulation.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"261 ","pages":"Article 106042"},"PeriodicalIF":4.2,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discussion of: “A simplified analytical formula for the coefficient of 3rd-order Hermite model and its application” by Weihu Chen and Yuji Tian","authors":"Nicholas J. Cook","doi":"10.1016/j.jweia.2025.106058","DOIUrl":"10.1016/j.jweia.2025.106058","url":null,"abstract":"<div><div>This discussion relates Chen and Tian j.jweia.2024.105887 “new simplified formula” for the Hermite polynomial method to the original benchmark of Yang et al j.jweia.2012.12.014, examines the internal consistency of both approaches and evaluates the inherent model error of the mapping process. A view is expressed as to the suitability of applying the method to the ubiquitous disjoint mixture timeseries found in wind engineering applications.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"260 ","pages":"Article 106058"},"PeriodicalIF":4.2,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A proposed approach for combined wind and temperature loading of power transmission lines considering climate change effect","authors":"Mohammad Ali Jafari,&nbsp;Salman Rezazadeh Baghal,&nbsp;Amir Mahmoudi","doi":"10.1016/j.jweia.2025.106057","DOIUrl":"10.1016/j.jweia.2025.106057","url":null,"abstract":"<div><div>This paper presents a framework to derive bivariate hazard curves for minimum temperature and maximum concurrent wind speed to characterize the combined wind and temperature loading of power transmission lines. Hazard curves are extracted for mean recurrence intervals (MRIs) of 50, 150, and 500-years, following IEC-60826 standard criteria. The framework employs the Joint Probability-Based Approach (JPBA) and Force-Based Approach (FBA) using numerical sampling of basic meteorological variables from historical data. It incorporates climate change effects by modeling minimum daily temperature trends through SARIMA time series analysis and Neural-Prophet machine learning. Correcting environmental effects is crucial for reliable meteorological simulations and accurate climate change trend capture. Considering climate change at the studied station, the framework shows minimum temperature extremes rise by 5 °C, 3 °C and 1 °C for 500, 150, and 50-year MRIs respectively. It models maximum daily wind speed probability distributions with monthly parameter variations. Simulations over 5000 years produce hazard curves based on JPBA and FBA and comparisons with IEC-60826 standard loading cases indicate conservative estimates in the JPBA-based approach. The IEC-60826 standard's first loading case for the 50 and 150-year MRIs is lower than the FBA-based hazard curves for all spans, with increasing underestimation as span length decreases.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"260 ","pages":"Article 106057"},"PeriodicalIF":4.2,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rapid evaluation of drivers’ ride comfort on long-span suspension bridges under VIV using Gaussian process regression","authors":"Han Li ,&nbsp;Ziluo Xiong ,&nbsp;Jin Zhu ,&nbsp;Longwei Ma ,&nbsp;Yongle Li ,&nbsp;Zongyu Gao","doi":"10.1016/j.jweia.2025.106060","DOIUrl":"10.1016/j.jweia.2025.106060","url":null,"abstract":"<div><div>Vortex-induced vibration (VIV) significantly affects ride comfort and may necessitate traffic restrictions, disrupting economic and social activities. The combined impact of VIV and traffic on ride comfort is not well understood, and existing studies are often too time-consuming for timely bridge management decisions. This study aims to explore ride comfort on long-span suspension bridges (LSSBs) during VIV and develop an online prediction model for real-time evaluations, aiding bridge management decisions. A vortex-traffic-bridge (VTB) simulation platform is established to extract vehicle dynamic responses and calculate motion sickness incidence (MSI) for evaluating ride comfort during VIV. MSI is treated probabilistically due to traffic flow's stochastic nature. The optimal probabilistic distribution model (PDM) for MSI data is identified using Jensen-Shannon divergence. A Gaussian process regression (GPR) surrogate model is constructed with VIV mode, VIV amplitude, and traffic density as inputs, and PDM parameters for MSI as outputs. A case study of a prototype LSSB using the GPR surrogate model thoroughly investigates the influence of VIV mode, VIV amplitude, and traffic density on MSI. This model can timely predict drivers' MSI under VIV, aiding effective bridge management decisions.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"260 ","pages":"Article 106060"},"PeriodicalIF":4.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification of flow regimes and dispersion pathways around in-line cylinders","authors":"G. Duan ,&nbsp;R. Gao ,&nbsp;L. Zhao ,&nbsp;T. Yang ,&nbsp;T. Takemi","doi":"10.1016/j.jweia.2025.106046","DOIUrl":"10.1016/j.jweia.2025.106046","url":null,"abstract":"<div><div>Flow and dispersion over in-line cylinders have received considerably less attention compared to those around isolated cylindrical obstacles in the fluid dynamics literature and within cuboid-delimited street canyons in the urban boundary-layer context. This investigation reveals that tank canyons share similar flow characteristics with street canyons while demonstrating distinct features. The flow regime transition from isolated to wake interference and skimming with respect to the canyon aspect ratio (<span><math><mrow><mi>A</mi><mi>R</mi></mrow></math></span>), well established for urban canyons, is preserved in the case of tank canyons; however, turbulent flux exchanges across the canyon side open boundaries are more pronounced in the latter, attributed to reinforced flow encirclement around the cylindrical obstacles and enhanced horseshoe vortices. Dispersion pathways, in particular the centre-of-mass translation and mean tracer ages (<span><math><msub><mrow><mi>τ</mi></mrow><mrow><mi>a</mi></mrow></msub></math></span>), closely align with the flow regime. The overall monotonic increase in <span><math><msub><mrow><mi>τ</mi></mrow><mrow><mi>a</mi></mrow></msub></math></span> with <span><math><mrow><mi>A</mi><mi>R</mi></mrow></math></span>, alongside a notable (<span><math><mrow><mo>∼</mo><mn>30</mn><mtext>%</mtext></mrow></math></span>) decrease in the mean canyon circulation timescale (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>), offers useful insights for the parameterisation of key timescales associated with flow and ventilation in cylinder-delimited canyons. Knowledge of the microenvironments within tank canyons is vital for integrating complex petrochemical plants into urban topographies, constituting an integral part of urban micrometeorological systems.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"260 ","pages":"Article 106046"},"PeriodicalIF":4.2,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cladding pressure and load characteristics of a tall building under a simulated tornado-like vortex: An experimental study","authors":"Nayan Deep Tiwari,&nbsp;Partha P. Sarkar","doi":"10.1016/j.jweia.2025.106059","DOIUrl":"10.1016/j.jweia.2025.106059","url":null,"abstract":"<div><div>Tornadoes, characterized by their destructive wind forces and unpredictable nature, pose a significant threat to tall buildings. Understanding the cladding pressure distribution on tall buildings during tornado events is crucial for designing these structures that can withstand extreme forces. The present study provides a comprehensive analysis of the aerodynamic loads and cladding pressure characteristics of a tall building in a tornado by employing an aeroelastic model under a laboratory-simulated tornado at Iowa State University-Tornado Simulator (ISU-TS) facility. This study utilizes a 1:350 scale model of a tapered tall building with a circular cross-section to evaluate the dynamic loads and pressure distribution along the height and perimeter of the building during a stationary and translating tornado. Particular attention has been given to study the correlation of aerodynamic loads as a function of the radial distance from the tornado core, with the comparison of results between the stationary and translating tornado cases. The results indicate that peak aerodynamic loads on the tall building model occur once the tornado has passed the building's center. Correlation analysis shows that cross-correlation coefficient values of aerodynamic forces decrease more significantly with increasing radial distance from the tornado's core. Wavelet analysis results indicate that the critical time period, where peak aerodynamic forces occur, differs between the two directions, implying the building's vulnerability to peak loads is direction dependent.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"260 ","pages":"Article 106059"},"PeriodicalIF":4.2,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sensitivity analysis of wavy wall performance in turbulent separation control: Effects of amplitude and period variations","authors":"Piotr Kamiński,&nbsp;Witold Elsner,&nbsp;Artur Tyliszczak,&nbsp;Paweł Niegodajew","doi":"10.1016/j.jweia.2025.106048","DOIUrl":"10.1016/j.jweia.2025.106048","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The influence of transversely oriented sinusoidal wall corrugation on an incompressible isothermal flow in the near-wall region, subjected to adverse pressure gradient conditions at a friction Reynolds number of &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;τ&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2500&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, is investigated using Large Eddy Simulation. This study is a continuation of the work (Kamiński et al., 2024) devoted to dynamics of the flow in the regions of crests and downhill/uphill waviness parts, and where the impact of the local and global pressure gradient were analysed. It focuses on the influence of the waviness parameters, such as amplitude (&lt;span&gt;&lt;math&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;) and number of waviness periods (&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;) on the turbulent boundary layer separation. In terms of the effective slope, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mo&gt;∝&lt;/mo&gt;&lt;mrow&gt;&lt;mo&gt;|&lt;/mo&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;|&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, where &lt;span&gt;&lt;math&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; is the streamwise direction, the analysed cases included the configurations with &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; ranging from &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (flat wall) to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;2455&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;051&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, where &lt;span&gt;&lt;math&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; is the length of a single waviness). Specifically, the primary objective was to identify a combination of &lt;span&gt;&lt;math&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; that would result in the greatest increase in the wall-shear stress &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;τ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;w&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, relative to the flat plate configuration, aiming to achieve the maximum postponement of turbulent separation. It is shown that the waviness significantly affects the flow field by enhancing the turbulent kinetic energy that leads to increased &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;τ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;w&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;. In particular, it is shown that the enhancement in TKE depends mainly on &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and not on particular values of &lt;span&gt;&lt;math&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;. Namely, the cases which are significantly diversified by &lt;span&gt;&lt;math&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; but are characterised by the same &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; exhibit almost identical TKE profiles. The highest increase ","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"260 ","pages":"Article 106048"},"PeriodicalIF":4.2,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancements in the physical simulation of near-surface extreme wind phenomena using hybrid active-passive flow control in a large boundary layer wind tunnel","authors":"Y. Pinyochotiwong,&nbsp;R.A. Catarelli,&nbsp;T.A. Chen,&nbsp;B.M. Phillips,&nbsp;F.J. Masters,&nbsp;J.A. Bridge,&nbsp;K.R. Gurley","doi":"10.1016/j.jweia.2024.105997","DOIUrl":"10.1016/j.jweia.2024.105997","url":null,"abstract":"<div><div>This paper presents advancements in the reduced-scale physical simulation of near-surface synoptic and non-synoptic extreme wind phenomena in a long-fetch boundary layer wind tunnel (BLWT). This research was carried out at the University of Florida's BLWT, which is one of the National Science Foundation's (NSF) Natural Hazards Engineering Research Infrastructure (NHERI) Experimental Facilities (EF). Flow fields in the UF BLWT are created by three computer-controlled flow-conditioning stages: vaneaxial fans (VAF), automated roughness elements collectively called the Terraformer (TF), and a multi-fan array called the Flow Field Modulator (FFM). The VAF and TF together can generate traditional BLWT log law atmospheric surface layer (ASL) wind velocity profiles. The FFM provides additional mean flow shaping, active turbulence modulation, and the ability to create nonstationary flow fields toward simulating non-synoptic events. A novel governing convergence algorithm (GCA) was developed to provide seamless closed-loop control of the three flow-conditioning stages toward achieving target profiles in the downwind test section. Three case studies covering a broad range of target flow conditions are demonstrated. The first case is a stationary non-monotonic mean target profile, illustrating the mean flow shaping capabilities of the GCA. The second case is a nonstationary non-monotonic transitioning flow, illustrating how the FFM can be used to transition between two GCA-converged targets. The third case is a stationary ASL flow profile where the GCA is used to converge longitudinal mean, turbulence intensity, and integral length scale profiles simultaneously. The results demonstrate that a multi-stage flow control approach with closed-loop convergence can achieve user-specified complex and transient flow conditions. The resultant flow capabilities expand the traditional limits of flow simulation, bringing the breadth of behaviors in real wind events and our controlled study of them closer together.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"259 ","pages":"Article 105997"},"PeriodicalIF":4.2,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}