Clarification of Generation Mechanism for Transient Fluid-induced Forces on Bluff Body due to Gusty Wind

阵风作用下钝体瞬态流体力产生机制的阐明

• 批准号: 21360213
• 负责人: SHIRATO Hiromichi
• 金额: $ 11.56万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21360213/
• 关键词: 風工学; 過渡流体力; 非定常空気力; 瞬発気流; 突風; 竜巻; 矩形断面; 5本円柱

An experimental setup which can reproduce lateral wind was newly manufactured and was used for the measurement of transient lift force on a square prism running along a guide rail. Some relationship to Karman vortex shedding was implied. The difficulty to identify each force component was also pointed out.Transient aerodynamic forces on a square prism and a group of 5 circular cylinders were measured by use of another existing wind tunnel which can also generate sudden increase of longitudinal wind velocity. It was found that the asymmetric generation of separation bubbles on both side surfaces was important for the mechanism of transient lift on a square prism. And the complex flow pattern around the 5 circular cylinders was found to determine the transient forces. The transient forces were well reproduced by CFD simulation which showed an evidence of relationship with Karman vortex. A simulation of time history of gusty wind due to an ideal tornado was conducted to discuss safety evaluation of a train wagon during tornado passage nearby.

研制了一套能再现侧向风的实验装置，用于测量沿沿着运动的方柱上的瞬态升力。这与卡门涡脱落有关。利用另一个同样能产生纵向风速突然增加的风洞，测量了作用在方柱体和5个圆柱体上的瞬态气动力。结果表明，分离气泡在两个侧面上的不对称产生是方柱瞬态升力产生的重要原因。并发现了5个圆柱体周围的复杂流态，以确定瞬态力。计算流体动力学模拟很好地再现了瞬态力，这表明了卡门涡的关系。为探讨列车在龙卷风过境时的安全性评估问题，对理想龙卷风引起的阵风时间历程进行了模拟。

项目成果

Transient Drag Force on 2-D Bluff Bodies under Gusty Wind Condition

阵风条件下二维断体的瞬态阻力

• 发表时间: 2009
• 期刊: Proceedings of the 7th Asia-Pacific Conference on Wind Engineering
• 作者: Hiromichi Shirato;Kohji Maeta;Yoshiaki Kato and Yuji Takasugi
• 通讯作者: Yoshiaki Kato and Yuji Takasugi

Flow Around a 2-D Bluff Body with Increasing Wind Velocity in Short Time Duration

短时间内风速增加的二维钝体周围的流动

• 发表时间: 2011
• 期刊: Proceedings of the 11th Asian Symposium on Flow Visualization
• 作者: Hiromichi Shirato;Osamu Sasaki;Kenji Inage
• 通讯作者: Kenji Inage

Study on Aerodynamic Forces of Basic Structural Sections by Gusty Wind

阵风作用下基本结构截面气动力研究

• 发表时间: 2010
• 期刊: Proceedings of the 23rd KKCNN Symposium on Civil Engieering
• 作者: Hiromichi Shirato;Yuichi Sato;Osamu Sasaki;Do Van Bao
• 通讯作者: Do Van Bao

突風作用下の柱状構造物の非定常空気力

阵风作用下柱状结构的非定常气动力

• 发表时间: 2011
• 期刊: 第60回理論応用力学講演会講演論文集
• 作者: 白土博通;佐々木治;稲毛健至
• 通讯作者: 稲毛健至

Transient Aerodynamic Forces due to Gusty Wind

阵风造成的瞬态空气动力

• 发表时间: 2010
• 作者: Hiromichi Shirato;Koji Maeta;Yoshiaki Kato;Yuji Takasugi;Osamu Sasaki
• 通讯作者: Osamu Sasaki