Journal of Wind Engineering and Industrial Aerodynamics最新文献

英文中文

Experimental simulation of downburst-like outflows and the associated dynamic properties of a self-supported transmission tower

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-10 DOI: 10.1016/j.jweia.2025.106032

Yongli Zhong , Eric Savory , Yichen Liu , Zhitao Yan , Yan Li , Qike Wei

This paper focuses on the replication of a downburst outflow with the plane wall jet approach and reports on the response of an aero-elastic model of a self-supported tower subjected to that outflow. The stationary and non-stationary wall jet flow is studied through velocity measurements at various elevations and downstream distances. The results indicate that the normalized mean velocity profiles from the current steady flow tests have a good agreement with the empirical models of the vertical profile for downbursts. The influence of the Reynolds number (Re) on the decay weakens when Re > 30,000. A rotating-gate device can generate the primary characteristics of the non-stationary downburst-like wind. The power spectral density of the residual turbulence from the generated non-stationary wind is consistent with the synoptic wind. The full-scale downburst recorded from the Andrews Air Force Base is used as the target event to verify the experimental procedure. The aero-elastic testing results show that the resonance contribution can reach more than 60% of the total fluctuating response of tower. There is no clear trend for the displacement and acceleration response with the change of downstream distance of the tower.

{"title":"Experimental simulation of downburst-like outflows and the associated dynamic properties of a self-supported transmission tower","authors":"Yongli Zhong , Eric Savory , Yichen Liu , Zhitao Yan , Yan Li , Qike Wei","doi":"10.1016/j.jweia.2025.106032","DOIUrl":"10.1016/j.jweia.2025.106032","url":null,"abstract":"<div><div>This paper focuses on the replication of a downburst outflow with the plane wall jet approach and reports on the response of an aero-elastic model of a self-supported tower subjected to that outflow. The stationary and non-stationary wall jet flow is studied through velocity measurements at various elevations and downstream distances. The results indicate that the normalized mean velocity profiles from the current steady flow tests have a good agreement with the empirical models of the vertical profile for downbursts. The influence of the Reynolds number (<em>Re</em>) on the decay weakens when <em>R</em>e > 30,000. A rotating-gate device can generate the primary characteristics of the non-stationary downburst-like wind. The power spectral density of the residual turbulence from the generated non-stationary wind is consistent with the synoptic wind. The full-scale downburst recorded from the Andrews Air Force Base is used as the target event to verify the experimental procedure. The aero-elastic testing results show that the resonance contribution can reach more than 60% of the total fluctuating response of tower. There is no clear trend for the displacement and acceleration response with the change of downstream distance of the tower.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"259 ","pages":"Article 106032"},"PeriodicalIF":4.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379143","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}

引用次数: 0

Vortex induced vibration analysis of a twin-box bridge deck by means of 3D LES simulations

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-08 DOI: 10.1016/j.jweia.2025.106015

A.J. Álvarez, F. Nieto

Twin-box decks are prone to suffer vortex-induced vibrations (VIV). Although this phenomenon has been widely studied experimentally, there are still gaps in our understanding about the complex interplay between the incoming flow, the windward and leeward boxes, and the potential oscillation of the deck. This work exploits the ability of 3D LES simulations to simulate complex aeroelastic phenomena to delve into the linkage between aerodynamic forcing and heave oscillation through detailed analysis of comprehensive datasets. Several reduced velocities are studied in the VIV-prone range of the bare deck of the Stonecutters Bridge, analysing the spectra of the time-histories of force coefficients, for the overall deck and individual boxes, and heave oscillations. Similarly, the contribution of the local lift coefficient has been studied along with the work done by the deck and the individual boxes at different reduced velocities. It has been found that the leeward box is the one governing the overall VIV response of the deck. The spanwise-averaged time-averaged work distribution around the deck permits the identification of those regions contributing to the heave oscillation build-up, enabling the design of aerodynamic countermeasures for mitigation of VIV tailored for the specific deck geometry and dynamical properties of the deck.

{"title":"Vortex induced vibration analysis of a twin-box bridge deck by means of 3D LES simulations","authors":"A.J. Álvarez, F. Nieto","doi":"10.1016/j.jweia.2025.106015","DOIUrl":"10.1016/j.jweia.2025.106015","url":null,"abstract":"<div><div>Twin-box decks are prone to suffer vortex-induced vibrations (VIV). Although this phenomenon has been widely studied experimentally, there are still gaps in our understanding about the complex interplay between the incoming flow, the windward and leeward boxes, and the potential oscillation of the deck. This work exploits the ability of 3D LES simulations to simulate complex aeroelastic phenomena to delve into the linkage between aerodynamic forcing and heave oscillation through detailed analysis of comprehensive datasets. Several reduced velocities are studied in the VIV-prone range of the bare deck of the Stonecutters Bridge, analysing the spectra of the time-histories of force coefficients, for the overall deck and individual boxes, and heave oscillations. Similarly, the contribution of the local lift coefficient has been studied along with the work done by the deck and the individual boxes at different reduced velocities. It has been found that the leeward box is the one governing the overall VIV response of the deck. The spanwise-averaged time-averaged work distribution around the deck permits the identification of those regions contributing to the heave oscillation build-up, enabling the design of aerodynamic countermeasures for mitigation of VIV tailored for the specific deck geometry and dynamical properties of the deck.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"258 ","pages":"Article 106015"},"PeriodicalIF":4.2,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349646","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}

引用次数: 0

Aerodynamic characteristics of windbreak wall–wind barrier transition section along high-speed railways during strong crosswinds

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-08 DOI: 10.1016/j.jweia.2025.106038

E Deng , Ling-Yi Diao , Huan Yue , Yue Dong

In the embankment–bridge transition section of high-speed railroads, solid windbreak walls and porous wind barriers serve as primary engineering measures to mitigate the effects of strong winds. This study investigates the mechanisms by which the aerodynamic performance of the transition section between solid windbreak walls and porous wind barriers deteriorates. Aerodynamic loads on trains, bridges, and wind barriers are analyzed in this study, which also examines the evolution of flow field characteristics and power spectral density (PSD) across spatial and temporal scales, based on wind tunnel tests, flow visualization tests, and computational fluid dynamics methods. The results reveal that the presence of double-sided wind barriers alters the distribution of turbulence intensity and vortex structures near the bridge–wind barriers compared to single-sided wind barriers. Additionally, double-sided wind barriers greatly increase the aerodynamic loads on trains and bridge–wind barriers compared to single-sided wind barriers. Furthermore, the peak PSD values for bridge-wind barriers with double-sided wind barriers are 1.9–4 times higher than those with single-sided wind barriers. Consequently, the single-sided wind barrier may be a more suitable choice for handling unidirectional crosswinds, considering construction costs and structural safety concerns for both the bridge and the wind barrier.

{"title":"Aerodynamic characteristics of windbreak wall–wind barrier transition section along high-speed railways during strong crosswinds","authors":"E Deng , Ling-Yi Diao , Huan Yue , Yue Dong","doi":"10.1016/j.jweia.2025.106038","DOIUrl":"10.1016/j.jweia.2025.106038","url":null,"abstract":"<div><div>In the embankment–bridge transition section of high-speed railroads, solid windbreak walls and porous wind barriers serve as primary engineering measures to mitigate the effects of strong winds. This study investigates the mechanisms by which the aerodynamic performance of the transition section between solid windbreak walls and porous wind barriers deteriorates. Aerodynamic loads on trains, bridges, and wind barriers are analyzed in this study, which also examines the evolution of flow field characteristics and power spectral density (PSD) across spatial and temporal scales, based on wind tunnel tests, flow visualization tests, and computational fluid dynamics methods. The results reveal that the presence of double-sided wind barriers alters the distribution of turbulence intensity and vortex structures near the bridge–wind barriers compared to single-sided wind barriers. Additionally, double-sided wind barriers greatly increase the aerodynamic loads on trains and bridge–wind barriers compared to single-sided wind barriers. Furthermore, the peak PSD values for bridge-wind barriers with double-sided wind barriers are 1.9–4 times higher than those with single-sided wind barriers. Consequently, the single-sided wind barrier may be a more suitable choice for handling unidirectional crosswinds, considering construction costs and structural safety concerns for both the bridge and the wind barrier.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"258 ","pages":"Article 106038"},"PeriodicalIF":4.2,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349008","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}

引用次数: 0

Numerical study on ventilation duct layout in subway stations for smoke control performance optimization

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-08 DOI: 10.1016/j.jweia.2025.106039

Chen Junfeng , Yang Dong , Zhong Maohua , Hua Fucai

Smoke is the most important threat to occupant safety in subway station fire accidents. However, only a few smoke control research has concerned the global ventilation system layout problem. With numerical simulation, this work explores the impact of ventilation system parameters on the smoke control efficiency in the hall area of a subway station. The proper ventilation duct layout distance is acquired according to the airflow field structure. The results suggest that: (1) The current ventilation system with two ducts 8m part in the subway station has been proved insufficient for smoke control with about 90% of the heat trapped in the station. (2) The lateral ventilation duct layout, i.e. the ventilation duct amount, is the decisive factor of the ventilation system efficiency. While ventilation volume and vent amount, which is generally considered important factors in traditional studies, show a limited impact on the overall ventilation efficiency. (3) A dimensionless airflow velocity is defined for ventilation duct influence range analysis. The influence range evaluation results are consistent with the tendency of smoke exhaust rate in different ventilation duct distance scenarios. The results could provide theoretical support for the ventilation duct layout design in subway stations.

{"title":"Numerical study on ventilation duct layout in subway stations for smoke control performance optimization","authors":"Chen Junfeng , Yang Dong , Zhong Maohua , Hua Fucai","doi":"10.1016/j.jweia.2025.106039","DOIUrl":"10.1016/j.jweia.2025.106039","url":null,"abstract":"<div><div>Smoke is the most important threat to occupant safety in subway station fire accidents. However, only a few smoke control research has concerned the global ventilation system layout problem. With numerical simulation, this work explores the impact of ventilation system parameters on the smoke control efficiency in the hall area of a subway station. The proper ventilation duct layout distance is acquired according to the airflow field structure. The results suggest that: (1) The current ventilation system with two ducts 8m part in the subway station has been proved insufficient for smoke control with about 90% of the heat trapped in the station. (2) The lateral ventilation duct layout, i.e. the ventilation duct amount, is the decisive factor of the ventilation system efficiency. While ventilation volume and vent amount, which is generally considered important factors in traditional studies, show a limited impact on the overall ventilation efficiency. (3) A dimensionless airflow velocity is defined for ventilation duct influence range analysis. The influence range evaluation results are consistent with the tendency of smoke exhaust rate in different ventilation duct distance scenarios. The results could provide theoretical support for the ventilation duct layout design in subway stations.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"258 ","pages":"Article 106039"},"PeriodicalIF":4.2,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349009","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}

引用次数: 0

An enhanced empirical model for moving downburst wind profiles: Integration with CFD simulations

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-07 DOI: 10.1016/j.jweia.2025.106037

Zhiyuan Fang , Zhisong Wang , Hanjie Huang

Downbursts are highly destructive local storm phenomena that pose significant threats to large-span engineering structures, such as transmission towers and power lines. Traditional radial wind profile models often rely on the vector superposition method to simulate moving downbursts. However, this approach inadequately captures the asymmetric effects of storm movement on the wind field structure. This paper proposes an enhanced empirical model that more accurately describes the radial wind profiles of moving downbursts. The model builds upon existing empirical approaches and is further refined through Computational Fluid Dynamics (CFD) simulations. The results demonstrate that the proposed model offers greater accuracy and flexibility in simulating moving downbursts compared to existing models, particularly in predicting wind loads on large-span structures. These findings provide a theoretical foundation for further refinement of downburst wind field models and serve as valuable references for the wind-resistant design of engineering structures.

引用次数: 0

Full-scale monitoring of a telecommunication lattice tower under synoptic and thunderstorm winds

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-06 DOI: 10.1016/j.jweia.2025.106022

Ileana Calotescu , Daniel Bîtcă , Maria Pia Repetto

This paper presents a full-scale monitoring system installed on a 50 m tall telecommunication lattice tower located in Sânnicolau Mare, Romania. The system has the dual purpose of measuring wind velocity and the wind-induced response of the tower, with particular attention to thunderstorms. It includes an ultrasonic anemometer, a temperature sensor, two triaxial accelerometers, six strain gauges and a video camera system. A first set of data recorded between January 2021 and December 2022 is analyzed in order to compare the dominant properties of thunderstorm and synoptic wind records and reveal the corresponding structural response. An improved approach to wind characterization based on anemometric and video data is proposed to separate the wind records into depressions and thunderstorms, highlighting the innovative use of video sequence to support classification of events. Anemometric and video data related to detected depressions and thunderstorms are presented, together with their full statistical characterizations. Wind induced structural response due to depression and thunderstorm records are described in terms of acceleration and strain. Patterns of depression and thunderstorm-induced response are presented, with the aim of emphasizing their diversity and complementing the identification of thunderstorms. Correlation of simultaneous wind velocity and structural response records is finally analyzed.

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引用次数: 0

Aerodynamics of a 5:1 rectangular cylinder under transient accelerated and decelerated winds

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-06 DOI: 10.1016/j.jweia.2025.106023

Qiang Zhou , Shuyang Cao , Md Mahbub Alam , Bing Han

The present study investigates the aerodynamic characteristics of a 5:1 rectangular cylinder subjected to transient accelerated and decelerated winds, utilizing synchronized pressure measurements in an actively controlled wind tunnel. This research addresses the limitations of existing wind-resistant design codes, which primarily consider synoptic winds, by focusing on the effects of non-synoptic winds. The results show that accelerating and decelerating winds significantly impact cylinder surface pressure, shear-layer reattachment position, spanwise cross-correlation of fluctuating pressure, and aerodynamic forces, with accelerating winds having a more pronounced effect than decelerating winds. Furthermore, the shear-layer reattachment position shifts upstream with increased wind acceleration or deceleration, resulting in a shorter separation bubble. Both accelerating and decelerating winds enhance fluctuating pressures, their spanwise correlations, flow two-dimensionality, and aerodynamic forces. Fluctuations in drag and lift coefficients exhibit an almost linear relationship with wind acceleration or deceleration.

{"title":"Aerodynamics of a 5:1 rectangular cylinder under transient accelerated and decelerated winds","authors":"Qiang Zhou , Shuyang Cao , Md Mahbub Alam , Bing Han","doi":"10.1016/j.jweia.2025.106023","DOIUrl":"10.1016/j.jweia.2025.106023","url":null,"abstract":"<div><div>The present study investigates the aerodynamic characteristics of a 5:1 rectangular cylinder subjected to transient accelerated and decelerated winds, utilizing synchronized pressure measurements in an actively controlled wind tunnel. This research addresses the limitations of existing wind-resistant design codes, which primarily consider synoptic winds, by focusing on the effects of non-synoptic winds. The results show that accelerating and decelerating winds significantly impact cylinder surface pressure, shear-layer reattachment position, spanwise cross-correlation of fluctuating pressure, and aerodynamic forces, with accelerating winds having a more pronounced effect than decelerating winds. Furthermore, the shear-layer reattachment position shifts upstream with increased wind acceleration or deceleration, resulting in a shorter separation bubble. Both accelerating and decelerating winds enhance fluctuating pressures, their spanwise correlations, flow two-dimensionality, and aerodynamic forces. Fluctuations in drag and lift coefficients exhibit an almost linear relationship with wind acceleration or deceleration.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"258 ","pages":"Article 106023"},"PeriodicalIF":4.2,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143354053","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}

引用次数: 0

Study of the applicability of different turbulence models in simulating vortex-induced vibration of a rectangular cylinder

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-05 DOI: 10.1016/j.jweia.2025.106031

Pengcheng Zou , Shuyang Cao , Da Cao

In this research, the practical applicability of LES, SST-DES and SST-URANS turbulence models to vortex-induced vibration (VIV) problems is investigated by employing a rectangular 5:1 cylinder as the study object. The efficacy of each model in predicting the displacement response, characterizing integrated aerodynamic forces, analyzing vortex shifting over the cylinder surface, and examining three-dimensional flow field effects is thoroughly assessed. The distribution characteristics and phase changes of aerodynamic force and flow field modes under vortex shedding frequency are analyzed based on the DMD method. All three turbulence models can accurately reproduce the lock-in phenomenon of VIV. The VIV response calculated by SST-DES is similar to experimental results and computation efficiency is improved by combining the features of LES and RANS. However, it is still challenging for SST-DES to capture the high-order vortex shedding frequency components of the flow fields in a similar manner to LES. In the SST-URANS simulation, greater work done by aerodynamic force leads to a larger steady-state amplitude. SST-URANS has difficulty in capturing small-scale vortex structures in the flow field and the main vortex location is closer to the leading edge than those obtained by LES and SST-DES. Compared with the results of LES, both SST-DES and SST-URANS overestimate the spanwise correlation of aerodynamic force, while SST-URANS weakens the three-dimensional effects of the flow fields, and the simulated vortex structure only exhibits a two-dimensional distribution. The simulation results supply data support and reference for the selection of turbulence models in the VIV simulations of prolate rectangular cylinders or bridges.

{"title":"Study of the applicability of different turbulence models in simulating vortex-induced vibration of a rectangular cylinder","authors":"Pengcheng Zou , Shuyang Cao , Da Cao","doi":"10.1016/j.jweia.2025.106031","DOIUrl":"10.1016/j.jweia.2025.106031","url":null,"abstract":"<div><div>In this research, the practical applicability of LES, SST-DES and SST-URANS turbulence models to vortex-induced vibration (VIV) problems is investigated by employing a rectangular 5:1 cylinder as the study object. The efficacy of each model in predicting the displacement response, characterizing integrated aerodynamic forces, analyzing vortex shifting over the cylinder surface, and examining three-dimensional flow field effects is thoroughly assessed. The distribution characteristics and phase changes of aerodynamic force and flow field modes under vortex shedding frequency are analyzed based on the DMD method. All three turbulence models can accurately reproduce the lock-in phenomenon of VIV. The VIV response calculated by SST-DES is similar to experimental results and computation efficiency is improved by combining the features of LES and RANS. However, it is still challenging for SST-DES to capture the high-order vortex shedding frequency components of the flow fields in a similar manner to LES. In the SST-URANS simulation, greater work done by aerodynamic force leads to a larger steady-state amplitude. SST-URANS has difficulty in capturing small-scale vortex structures in the flow field and the main vortex location is closer to the leading edge than those obtained by LES and SST-DES. Compared with the results of LES, both SST-DES and SST-URANS overestimate the spanwise correlation of aerodynamic force, while SST-URANS weakens the three-dimensional effects of the flow fields, and the simulated vortex structure only exhibits a two-dimensional distribution. The simulation results supply data support and reference for the selection of turbulence models in the VIV simulations of prolate rectangular cylinders or bridges.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"258 ","pages":"Article 106031"},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167360","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}

引用次数: 0

Eulerian RANS simulation of pollutant dispersion in atmospheric boundary layer considering anisotropic and near-source diffusivity behavior

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-05 DOI: 10.1016/j.jweia.2025.106036

Chao Lin , Ryozo Ooka , Hongyuan Jia , Alessandro Parente , Hideki Kikumoto

This study proposes an anisotropic concentration diffusivity model in the Reynolds-averaged Navier-Stokes equations (RANS) and the Eulerian dispersion model. The proposed model combines models to consider the turbulent anisotropic and near-source limited diffusivity based on the generalized gradient-diffusion hypothesis and travel time. The proposed model and conventional isotropic models were applied to predict the pollutant dispersion in an atmospheric boundary layer from elevated and ground-level sources. The predicted concentration profile and plume half-width were validated with a previous wind tunnel experiment in the literature. Both the proposed and isotropic models using the diffusivity limiter accurately predicted the mean concentration profiles at the central vertical plane. The isotropic models did not accurately predict the horizontal and vertical plume widths of the ground-level source while the proposed model successfully predicted those. The equivalent turbulent Schmidt numbers in the proposed model differed in each direction. The proposed model predicted counter-gradient turbulent diffusion in the streamwise direction. In addition, accurate Reynolds stress was found to be crucial for reproducing the anisotropic concentration diffusivity in the proposed model.

{"title":"Eulerian RANS simulation of pollutant dispersion in atmospheric boundary layer considering anisotropic and near-source diffusivity behavior","authors":"Chao Lin , Ryozo Ooka , Hongyuan Jia , Alessandro Parente , Hideki Kikumoto","doi":"10.1016/j.jweia.2025.106036","DOIUrl":"10.1016/j.jweia.2025.106036","url":null,"abstract":"<div><div>This study proposes an anisotropic concentration diffusivity model in the Reynolds-averaged Navier-Stokes equations (RANS) and the Eulerian dispersion model. The proposed model combines models to consider the turbulent anisotropic and near-source limited diffusivity based on the generalized gradient-diffusion hypothesis and travel time. The proposed model and conventional isotropic models were applied to predict the pollutant dispersion in an atmospheric boundary layer from elevated and ground-level sources. The predicted concentration profile and plume half-width were validated with a previous wind tunnel experiment in the literature. Both the proposed and isotropic models using the diffusivity limiter accurately predicted the mean concentration profiles at the central vertical plane. The isotropic models did not accurately predict the horizontal and vertical plume widths of the ground-level source while the proposed model successfully predicted those. The equivalent turbulent Schmidt numbers in the proposed model differed in each direction. The proposed model predicted counter-gradient turbulent diffusion in the streamwise direction. In addition, accurate Reynolds stress was found to be crucial for reproducing the anisotropic concentration diffusivity in the proposed model.</div></div>","PeriodicalId":54752,"journal":{"name":"Journal of Wind Engineering and Industrial Aerodynamics","volume":"258 ","pages":"Article 106036"},"PeriodicalIF":4.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of turbulence on vortex-excited coupled vehicle-bridge systems: Wind tunnel investigation

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics

Pub Date : 2025-02-03 DOI: 10.1016/j.jweia.2025.106020

Hao-Yang Li , You-Lin Xu , Ming-Shui Li , Le-Dong Zhu

An accurate assessment of driving comfort and safety of road vehicles on a long-span bridge subjected to vortex-induced vibration (VIV) is crucial for bridge managers to decide whether the bridge should be closed to traffic or not. However, the previous studies often overlook the effects of turbulence on coupled vehicle and bridge systems subjected to VIV although turbulence does exist on site. In this study, vortex-excited coupled truck-bridge deck models were tested in a big wind tunnel under smooth and turbulence flows. Vortex-induced response (VIR) and vortex-induced force (VIF) of the bridge deck and the aerodynamic forces on the truck were measured simultaneously. The effects of the turbulence on VIR and VIF of the bridge deck with the truck(s) placed on different lanes were explored. The effects of turbulence on the mean and peak aerodynamic forces as well as acceleration response of the truck on the vortex-excited bridge deck were also investigated. The results show that VIR and VIF of the bridge deck are significantly influenced by turbulence intensities and truck locations. The mean and peak aerodynamic forces as well as acceleration response of the truck also vary significantly with turbulence intensities and truck locations.

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