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CLC number: TU318.1

On-line Access: 2017-10-06

Received: 2016-10-21

Revision Accepted: 2017-02-21

Crosschecked: 2017-09-07

Cited: 0

Clicked: 6399

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Wei Ding

http://orcid.org/0000-0002-5556-2364

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Journal of Zhejiang University SCIENCE A 2017 Vol.18 No.10 P.793-806

http://doi.org/10.1631/jzus.A1600691


Large eddy simulation of unsteady aerodynamic behavior of long-span vaulted roofs


Author(s):  Wei Ding, Yasushi Uematsu

Affiliation(s):  School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China; more

Corresponding email(s):   emily_dw@163.com

Key Words:  Long-span vaulted roof, Unsteady aerodynamic behavior, Large eddy simulation (LES), Wind tunnel experiment, Forced vibration test


Wei Ding, Yasushi Uematsu. Large eddy simulation of unsteady aerodynamic behavior of long-span vaulted roofs[J]. Journal of Zhejiang University Science A, 2017, 18(10): 793-806.

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author="Wei Ding, Yasushi Uematsu",
journal="Journal of Zhejiang University Science A",
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pages="793-806",
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doi="10.1631/jzus.A1600691"
}

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%T Large eddy simulation of unsteady aerodynamic behavior of long-span vaulted roofs
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%A Yasushi Uematsu
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DOI - 10.1631/jzus.A1600691


Abstract: 
This paper discusses the unsteady aerodynamic behavior of long-span vaulted roofs. First, a forced vibration test in a turbulent boundary layer is conducted in a wind tunnel. The models are force vibrated in the first anti-symmetric mode to investigate the effects of wind speed, rise/span ratio, and the amplitude and frequency of forced vibration on the distributions of wind pressures and unsteady aerodynamic forces. Then, a large eddy simulation (LES) is carried out to clarify the physical mechanism of wind-roof interaction as well as to investigate the influences of a roof’s vibration on the flow field around the roof. From the results of the wind tunnel experiment and the LES, we discuss the characteristics of unsteady aerodynamic forces on a long-span vaulted roof over a wide range of the reduced frequency of vibration. The effect of unsteady aerodynamic forces on the dynamic response of the roof is also discussed. A comparison between the wind tunnel experiment and the LES indicates that the LES can be used effectively to evaluate the unsteady aerodynamic behavior.

基于大涡模拟方法研究大跨度曲面屋盖非定常气动力的特性

目的:探讨作用于大跨度曲面屋盖非定常气动力的特性,为考虑非定常气动力影响的大跨度曲面屋盖抗风设计提供理论参考。
创新点:1. 采用强迫振动试验;2. 采用大涡模拟(LES)流入脉动风的生成方法;3. 研究大跨度曲面屋盖非定常气动力特性。
方法:1. 通过强迫振动风洞试验方法探讨风速、强迫振动振幅、屋盖的矢跨比和缩减频率对非定常气动力的影响;2. 采用计算流体力学数值模拟重现风洞试验,从而在更宽的缩减频率范围内分析非定常气动力的特性,并且通过可视化流场的分析探讨风与屋盖相互作用的机理。
结论:1. 屋盖的振动对屋盖表面的风压分布影响较大。2. 屋盖的振动可能抑制屋盖背风面漩涡的脱落。3. 根据风洞试验和数值模拟的结果分析得到的矢跨比、风速和振动振幅对气动阻尼系数和气动刚度系数的影响较小;气动阻尼系数和气动刚度系数主要随着缩减频率的变化而变化。4. 气动刚度系数为正值,使得结构的总刚度减小,从而减小结构的固有频率;气动阻尼系数为负值,使得结构总阻尼增加。5. 风洞试验和LES模拟结果的一致性可以说明,LES是一个能够有效研究非定常气动力特性的数值模拟方法。

关键词:大涡模拟;大跨度曲面屋盖;非定常气动力;风洞试验;强迫振动试验

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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