Clarification of localized structure in gust hazard from the viewpoint of turbulent organzied motion
从湍流有组织运动的角度阐明阵风灾害的局部结构
基本信息
- 批准号:24656127
- 负责人:
- 金额:$ 2.5万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Challenging Exploratory Research
- 财政年份:2012
- 资助国家:日本
- 起止时间:2012-04-01 至 2014-03-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Traveling microbursts were reproduced by dropping dense solution in a water tank. The velocity fields of them were measured through a DPIV method. Mean velocity trace of the simulated microbursts was similar to that of actual them. Turbulence intensity was only 10 % of the peak velocity. The horizontal velocity fields of gust front realized in the multifan wind tunnel were almost uniform. These facts show that localized wind hazards do not occur due to the turbulent fluctuation in atmospheric boundary layer. We found that the localized wind gust appeared when the downdraft was not disturbed by surrounding vortices and concentrated. The simulated localized wind gust was found to correspond to be 30 m/s in the actual microburst whose mean velocity is 16 m/s.
通过在水箱中滴下浓溶液来再现行进微暴流。用DPIV方法测量了它们的速度场。模拟微下击暴流的平均速度迹线与实际微下击暴流的平均速度迹线相似。湍流强度仅为峰值速度的10%。在多风扇风洞中得到的阵风锋水平速度场基本均匀。这些事实表明,由于大气边界层中的湍流脉动,局部风灾害不会发生。我们发现,当下沉气流不受周围涡的扰动而集中时,就会出现局部阵风。在平均风速为16 m/s的实际微下击暴流中,模拟的局部阵风风速为30 m/s。
项目成果
期刊论文数量(9)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Summaries to Technical Papers of Annual Meeteng, JAWE
JAWE年会技术论文摘要
- DOI:10.5359/jawe.38.105
- 发表时间:2013
- 期刊:
- 影响因子:0
- 作者:坂井勇斗;佐々浩司
- 通讯作者:佐々浩司
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{{ truncateString('SASSA Koji', 18)}}的其他基金
Study on severe storms causing tornadoes at Pacific coast ofJapan
日本太平洋沿岸强风暴引发龙卷风的研究
- 批准号:
22310112 - 财政年份:2010
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Clarification of turbulent fine-scale structure in a stable stratified flow
稳定分层流中湍流细尺度结构的澄清
- 批准号:
10650180 - 财政年份:1998
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
相似海外基金
Observational Study on the Movement of Gust phenomena and Cumulonimbus Initiation around the Metropolitan area, Japan
日本首都圈周边阵风现象运动和积雨云生成的观测研究
- 批准号:
23510232 - 财政年份:2011
- 资助金额:
$ 2.5万 - 项目类别:
Grant-in-Aid for Scientific Research (C)