基于RANS/LES混合方法的箱梁气动导纳函数研究

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摘要为了研究RANS/LES混合方法在桥梁非定常气动力的应用以及大积分尺度湍流中桥梁断面的气动导纳函数，首先选取三种典型的RANS/LES混合方法，即SBES（stress-blended eddy simulation）方法、SAS（scale-adaptive simulation）方法、WMLES（wall-modeled LES）方法，分别对三种方法的特点和适用性进行简要的概述，然后在均匀流中将其用于箱梁断面和分离式双箱梁断面气动力的计算，最后在提出的改进湍流合成方法基础上，实现了与实际桥位处积分尺度类似的大积分尺度湍流模拟，在此流场中识别了箱梁断面的气动导纳函数。数值计算结果表明，SBES方法适用于弱流动不稳定和强流动不稳定流场气动力的模拟，SAS方法仅适用于显著流动分离的断面，而WMLES方法对两种断面整体表现都较差。对于流线型箱梁断面，大积分尺度湍流场中识别的升力气动导纳在低频处大于Sears函数和小尺度湍流场中的结果，并显著大于节段模型风洞试验结果。在高频处大积分尺度湍流场的结果与小尺度湍流场以及风洞试验结果吻合较好。研究结果表明，将传统小尺度格栅湍流场风洞试验识别的气动导纳用于桥梁抖振分析时，会导致低频处的抖振力显著偏小。

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	张伟峰1
	张志田2

关键词 ：桥梁断面, RANS/LES方法, 数值模拟, 大尺度湍流, 气动导纳

Abstract：In order to study the applicability of hybrid RANS/LES method in unsteady aerodynamic forces and aerodynamic admittance functions of bridge sections in large-scale turbulent flow, three typical hybrid RANS/LES methods, namely SBES（stress-blended eddy simulation）, SAS（scale-adaptive simulation） and WMLES (wall-modeled LES）, were briefly summarized. Then they were used in the simulation of aerodynamic forces of a streamlined box-girder section and twin-box girder section in uniform flow. Finally, based on an improved turbulence synthesis method, a large-scale turbulent flow comparable to the actual bridge site was synthesized, and the aerodynamic admittance functions of the box-girder section were identified. The numerical results show that the SBES method is suitable for the simulation of aerodynamic forces of weak unstable flow and strong unstable flow.The SAS method is only suitable for the section with significant flow separation. The WMLES method has poor performance for both sections. For the box-girder section, the lift aerodynamic admittances identified in the large-scale turbulent flow is large than the result in the small-scale turbulent flow and the Sears function, and is also significantly larger than the wind tunnel test result of the segmental model. At high frequency, the results in the large-scale turbulent flow are in good agreement with the results in the small-scale turbulent flow and wind tunnel test. The results show that when the aerodynamic admittances identified in the traditional small-scale grid generated turbulent flow are used for bridge buffeting analyses, the buffeting forces at low frequency will be significantly undervalued.

Key words： box-girder section RANS/LES method numerical simulation large-scale turbulent flow aerodynamic admittance

收稿日期: 2022-06-06 出版日期: 2023-09-28

引用本文:

张伟峰1，张志田2. 基于RANS/LES混合方法的箱梁气动导纳函数研究[J]. 振动与冲击, 2023, 42(18): 19-29.
ZHANG Weifeng1，ZHANG Zhitian2. Aerodynamic admittance functions of box girders based on hybrid RANS/LES methods. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(18): 19-29.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I18/19

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