{"title":"The Wake Characteristics of a Sphere with a Uniaxial Through-hole in a Uniform Flow","authors":"Hayato Kato, K. Takamure, T. Uchiyama","doi":"10.5359/jwe.47.1","DOIUrl":"https://doi.org/10.5359/jwe.47.1","url":null,"abstract":"","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90338371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Estimation and Verification of Maximum Response Acceleration Based on Spectral Modal Analysis of a High-rise Building Using WRF Simulation Data","authors":"Yuki Takadate, T. Takemi, Y. Okuda","doi":"10.5359/jwe.47.27","DOIUrl":"https://doi.org/10.5359/jwe.47.27","url":null,"abstract":"","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88541457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Worldwide Status on Legal and Regulatory Frameworks with Provisions Related to Wind-resistant Design of Buildings","authors":"Akira Hayakawa, M. Matsui, Y. Tamura","doi":"10.5359/jwe.47.5","DOIUrl":"https://doi.org/10.5359/jwe.47.5","url":null,"abstract":"","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90531075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Haruo Oda, Wataru Mashiko, Eriko Tomokiyo, M. Noda
{"title":"Analysis of Roof Damage Distribution Caused by Typhoons and Damage Probability Estimation based on the Weakest Link Model","authors":"Haruo Oda, Wataru Mashiko, Eriko Tomokiyo, M. Noda","doi":"10.5359/jwe.47.18","DOIUrl":"https://doi.org/10.5359/jwe.47.18","url":null,"abstract":"","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84686654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Tachibana, R. Yoshie, Satoru Nakayama, Takeshi Kishida, K. Miyashita, R. Sasaki
This study aims to validate prediction of pollutant dispersion in urban area based on wind tunnel experiment. For this purpose, wind tunnel experiments and filed measurements of tracer gas dispersion were conducted in the campus of Tokyo Polytechnic University, and their results were compared. In addition, wind tunnel experiment was carried out under various conditions of experimental model scale, wind speed, and pollutant emission rates to confirm similarity law. The normalized concentration obtained by the wind tunnel experiments agreed well with the field measurement data. It was also confirmed that the normalized non-dimensional concentration was nearly independent of experimental model scale, wind speed, and pollutant emission rate. keywords: pollutant dispersion, field measurement, wind tunnel experiments, similarity law
{"title":"Comparison between Field Measurement and Wind Tunnel Experiments of Gas Dispersion in an Urban Area and Verification of Similarity Law","authors":"T. Tachibana, R. Yoshie, Satoru Nakayama, Takeshi Kishida, K. Miyashita, R. Sasaki","doi":"10.5359/jwe.47.39","DOIUrl":"https://doi.org/10.5359/jwe.47.39","url":null,"abstract":"This study aims to validate prediction of pollutant dispersion in urban area based on wind tunnel experiment. For this purpose, wind tunnel experiments and filed measurements of tracer gas dispersion were conducted in the campus of Tokyo Polytechnic University, and their results were compared. In addition, wind tunnel experiment was carried out under various conditions of experimental model scale, wind speed, and pollutant emission rates to confirm similarity law. The normalized concentration obtained by the wind tunnel experiments agreed well with the field measurement data. It was also confirmed that the normalized non-dimensional concentration was nearly independent of experimental model scale, wind speed, and pollutant emission rate. keywords: pollutant dispersion, field measurement, wind tunnel experiments, similarity law","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"166 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73010060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Hydro-VENUS is an energy harvester exploiting the flow-induced oscillation of a pendulum-like blade. In this study, the effects of the angular amplitude and non-dimensional flow velocity on the energy harvesting performance of the Hydro-VENUS are investigated through water channel tests. A semi-elliptical cross-section blade with the cross-sectional aspect ratio of 6 is employed in these tests. The experimental results revealed that the maximum power coefficient is obtained at specific angular amplitude and non-dimensional flow velocity. The approximate solution for the power coefficient is theoretically provided considering non-linearity of hydrodynamic forces acting on the blade. This theoretical approach revealed that the power coefficient is determined by tip speed ratio of the blade and the maximum power coefficient is obtained at specific tip speed ratio.
{"title":"Experimental and Theoretical Study on Energy Harvesting Performance of Galloping-Based Energy Harvester Using Rotationally Oscillating Blade","authors":"S. Hiejima, Kazuki Izumi","doi":"10.5359/JWE.46.1","DOIUrl":"https://doi.org/10.5359/JWE.46.1","url":null,"abstract":"The Hydro-VENUS is an energy harvester exploiting the flow-induced oscillation of a pendulum-like blade. In this study, the effects of the angular amplitude and non-dimensional flow velocity on the energy harvesting performance of the Hydro-VENUS are investigated through water channel tests. A semi-elliptical cross-section blade with the cross-sectional aspect ratio of 6 is employed in these tests. The experimental results revealed that the maximum power coefficient is obtained at specific angular amplitude and non-dimensional flow velocity. The approximate solution for the power coefficient is theoretically provided considering non-linearity of hydrodynamic forces acting on the blade. This theoretical approach revealed that the power coefficient is determined by tip speed ratio of the blade and the maximum power coefficient is obtained at specific tip speed ratio.","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81007316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The wind characteristics of downbursts are significantly different from those of turbulent boundary layers. The nonstationarity, especially caused by a severe moving downdraft and strong divergent outflow near the ground, causes serious damage to buildings. The present paper investigates the characteristics of downbursts and its effects on buildings, based on an experiment with three kinds of jets, i.e., a pulsed jet, a moving jet and a pulsed moving jet, using a moving jet simulator that we have developed. The effects of non-stationarity of downbursts on the wind pressures and forces acting on buildings with three different sizes and six different heights are discussed. Finally, an evaluation method of downburst-induced wind loads on buildings is proposed based on the experimental results.
{"title":"Experimental Study of Downburst-induced Wind Loading on Buildings with Different Sizes and Heights","authors":"Yumi Iida, Kazunori Asano, Y. Uematsu","doi":"10.5359/jwe.46.12","DOIUrl":"https://doi.org/10.5359/jwe.46.12","url":null,"abstract":"The wind characteristics of downbursts are significantly different from those of turbulent boundary layers. The nonstationarity, especially caused by a severe moving downdraft and strong divergent outflow near the ground, causes serious damage to buildings. The present paper investigates the characteristics of downbursts and its effects on buildings, based on an experiment with three kinds of jets, i.e., a pulsed jet, a moving jet and a pulsed moving jet, using a moving jet simulator that we have developed. The effects of non-stationarity of downbursts on the wind pressures and forces acting on buildings with three different sizes and six different heights are discussed. Finally, an evaluation method of downburst-induced wind loads on buildings is proposed based on the experimental results.","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88632521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Typhoon Jebi (T1821) derived significant damages around Kansai area in Japan and recorded the highest fire insurance payment. Therefore, the accurate estimation of wind field for Jebi is quite important for the future ratemaking. In this study, several models, which are an engineering typhoon model, a meteorological model and combined/maximum of those models were used for the estimation and validated by using measurements at weather stations and compared with fire insurance payment database. Wind speeds obtained from the engineering typhoon model show better agreement with measurements at weather stations than the meteorological model. On the other hand, the wind speed distribution from the meteorological model shows best agreement with damage occurrences in the insurance payment database, and the wind speeds are higher than the engineering model in those area. It is also found that the relation between estimated wind speeds and damage occurrences are slightly improved by considering seismic intensity of the 2018 Osaka earthquake as regression parameters.
{"title":"Evaluations of Wind Field Estimations for Typhoon Jebi (T1821) by Using Fire Insurance Experience in Kansai Area","authors":"Jun Tanemoto, Haruki Yamamoto","doi":"10.5359/jwe.46.47","DOIUrl":"https://doi.org/10.5359/jwe.46.47","url":null,"abstract":"Typhoon Jebi (T1821) derived significant damages around Kansai area in Japan and recorded the highest fire insurance payment. Therefore, the accurate estimation of wind field for Jebi is quite important for the future ratemaking. In this study, several models, which are an engineering typhoon model, a meteorological model and combined/maximum of those models were used for the estimation and validated by using measurements at weather stations and compared with fire insurance payment database. Wind speeds obtained from the engineering typhoon model show better agreement with measurements at weather stations than the meteorological model. On the other hand, the wind speed distribution from the meteorological model shows best agreement with damage occurrences in the insurance payment database, and the wind speeds are higher than the engineering model in those area. It is also found that the relation between estimated wind speeds and damage occurrences are slightly improved by considering seismic intensity of the 2018 Osaka earthquake as regression parameters.","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91174237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kazutaka Goto, H. Takimoto, Takeshi Kishida, H. Ono, A. Sato
Predictions of atmospheric dispersion based on wind-tunnel experiments and numerical simulations are generally executed under the quasi-steady state of wind fields. They however fail to consider the fluctuations in realistic wind directions. Therefore, the dispersion of air pollutants is often underestimated leading to an overestimation of their maximum concentration. For accurate estimations of atmospheric dispersion, it is important to know the variations in wind fields. In this study, the characteristics of the hourly standard deviation of wind direction fluctuation (σ θ ) were investigated using elevated observational data along the coast of the Japan Sea. The conditions of meteorological fields and of terrains were similar to those around thermal or nuclea r power plants. The results suggested that σ θ was mainly dependent on wind speed and the atmospheric stability. However , σ θ varied widely even for the same meteorological conditions, indicating the influences of the surrounding terrain and long-period wind fluctuations.
{"title":"Study on Characteristic of Standard Deviation of Wind Direction Fluctuation for Atmospheric Dispersion Simulation","authors":"Kazutaka Goto, H. Takimoto, Takeshi Kishida, H. Ono, A. Sato","doi":"10.5359/jwe.46.33","DOIUrl":"https://doi.org/10.5359/jwe.46.33","url":null,"abstract":"Predictions of atmospheric dispersion based on wind-tunnel experiments and numerical simulations are generally executed under the quasi-steady state of wind fields. They however fail to consider the fluctuations in realistic wind directions. Therefore, the dispersion of air pollutants is often underestimated leading to an overestimation of their maximum concentration. For accurate estimations of atmospheric dispersion, it is important to know the variations in wind fields. In this study, the characteristics of the hourly standard deviation of wind direction fluctuation (σ θ ) were investigated using elevated observational data along the coast of the Japan Sea. The conditions of meteorological fields and of terrains were similar to those around thermal or nuclea r power plants. The results suggested that σ θ was mainly dependent on wind speed and the atmospheric stability. However , σ θ varied widely even for the same meteorological conditions, indicating the influences of the surrounding terrain and long-period wind fluctuations.","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90382490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Study of Aerodynamic Coefficients on a Train Car Considering Turbulence Effects of Approaching Flow","authors":"Yosuke Nagumo, T. Ishihara","doi":"10.5359/jwe.44.90","DOIUrl":"https://doi.org/10.5359/jwe.44.90","url":null,"abstract":"","PeriodicalId":38974,"journal":{"name":"Journal of Wind Engineering","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88530856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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