[1]汪之松,思建有,方智远,等.考虑时空变化的雷暴冲击风风场特性[J].东南大学学报(自然科学版),2019,49(2):348-355.[doi:10.3969/j.issn.1001-0505.2019.02.021]
 Wang Zhisong,Si Jianyou,Fang Zhiyuan,et al.Wind field characteristics of thunderstorm considering spatiotemporal variation[J].Journal of Southeast University (Natural Science Edition),2019,49(2):348-355.[doi:10.3969/j.issn.1001-0505.2019.02.021]
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考虑时空变化的雷暴冲击风风场特性()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第2期
页码:
348-355
栏目:
建筑学
出版日期:
2019-03-20

文章信息/Info

Title:
Wind field characteristics of thunderstorm considering spatiotemporal variation
作者:
汪之松12思建有1方智远1唐阳红1
1重庆大学土木工程学院, 重庆 400045; 2重庆大学山地城镇建设与新技术教育部重点实验室, 重庆 400045
Author(s):
Wang Zhisong12 Si Jianyou1 Fang Zhiyuan1 Tang Yanghong1
1School of Civil Engineering, Chongqing University, Chongqing 400045, China
2Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China
关键词:
雷暴冲击风 时空变化 大涡模拟 风场特性
Keywords:
thunderstorm spatiotemporal variation large eddy simulation(LES) wind field characteristics
分类号:
TU14
DOI:
10.3969/j.issn.1001-0505.2019.02.021
摘要:
为研究雷暴冲击风全周期内风场时空变化特性,基于流体力学计算软件FLUENT,采用大涡模拟进行风场瞬态模拟,并结合风暴中心移动及出流风速衰减这2个影响风场特性的主要因素,更加接近真实地模拟实际雷暴冲击风的发展至消散过程.模拟结果表明:受风暴移动和下沉气流变化影响,整体风场呈现出不稳定、随时间和空间变化剧烈的特点;风暴前方存在较大旋涡,水平风速沿竖向分布呈现出典型的鼻状下击暴流风剖面;风暴中心移动路径附近位置的风速时程规律与实测数据特征基本吻合;风暴中心后方产生较多小漩涡,湍流度较大.因此,对于处在雷暴冲击风影响范围内的结构和建筑物,除了需要考虑雷暴冲击风的正面侵袭外,还应考虑风暴中心经过后尾流区域涡旋的影响.
Abstract:
To study the spatiotemporal variation characteristics of wind field in the whole period of thunderstorm impact wind, based on the fluid mechanics calculation software FLUENT, a wind field was simulated by the large eddy simulation(LES). The development and the dissipation of downburst events were simulated more realistically by using the main factors affecting wind field characteristics including the movement of the storm center and the attenuation of the outflow wind velocity. The simulation results show that the overall wind field is unstable and changes dramatically with time and space due to the movement of the storm and the variation of downdraft. In front of the storm, there are large vortices, and the vertical profile of the horizontal wind speed presents a typical nose-shaped thunderstorm velocity profile. The wind velocity time history near the central path of the storm is consistent with the measured data. There are several small vortices behind the center of the storm with a high degree of turbulence. Therefore, as for the structures and the buildings within the influence range of thunderstorm impact wind, the positive impact of thunderstorm impact wind and the influence of the vortex after the storm center passes through the wake area should be considered.

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备注/Memo

备注/Memo:
收稿日期: 2018-08-27.
作者简介: 汪之松(1980—),男,博士,副教授,wangzhisong@cqu.edu.cn.
基金项目: 国家自然科学基金资助项目(51208537).
引用本文: 汪之松,思建有,方智远,等.考虑时空变化的雷暴冲击风风场特性[J].东南大学学报(自然科学版),2019,49(2):348-355. DOI:10.3969/j.issn.1001-0505.2019.02.021.
更新日期/Last Update: 2019-03-20