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（英文）
发布时间：2019-07-05 09:59
【摘要】：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。
[Abstract]:Aim: to investigate the characteristics of non-steady aerodynamics of long-span curved roof, and to provide theoretical reference for wind resistance design of long-span curved roof considering the influence of unstable aerodynamics. Innovation: 1. Forced vibration test was used; 2. The generation method of large vortex simulation of (LES) inflow pulsating wind is adopted. The non-steady hydrodynamic characteristics of long-span curved roof are studied. Method: 1. The effects of wind speed, forced vibration amplitude, rise-span ratio and reduced frequency of roof on unstable aerodynamics are discussed by forced vibration wind tunnel test method. The numerical simulation of computational fluid dynamics is used to reproduce the wind tunnel test, so as to analyze the characteristics of unstable aerodynamics in a wider reduced frequency range, and the mechanism of interaction between wind and roof is discussed through the analysis of visual flow field. Conclusion: 1. The vibration of the roof has a great influence on the wind pressure distribution on the surface of the roof. 2. The vibration of the roof may inhibit the shedding of the vortex on the leeward surface of the roof. 3. According to the results of wind tunnel test and numerical simulation, the rise-span ratio, wind speed and vibration amplitude have little effect on the pneumatic damping coefficient and pneumatic stiffness coefficient, and the pneumatic damping coefficient and pneumatic stiffness coefficient mainly change with the reduction frequency. 4. The total stiffness coefficient of the structure is positive, so that the total stiffness of the structure is reduced, thus the natural frequency of the structure is reduced, and the total damping coefficient of the structure is negative, which increases the total damping of the structure. 5. The consistency between wind tunnel test and LES simulation results shows that LES is an effective numerical simulation method which can effectively study the unsteady aerodynamic characteristics.
【作者单位】： School
【基金】：Project supported by the Foundation of Jiangsu Collaborative Innovation Center for Building Energy Saving Construction Technology for Young Teachers(No.SJXTQ1515),China
【分类号】：TU352.2
，
本文编号：2510445
[Abstract]:Aim: to investigate the characteristics of non-steady aerodynamics of long-span curved roof, and to provide theoretical reference for wind resistance design of long-span curved roof considering the influence of unstable aerodynamics. Innovation: 1. Forced vibration test was used; 2. The generation method of large vortex simulation of (LES) inflow pulsating wind is adopted. The non-steady hydrodynamic characteristics of long-span curved roof are studied. Method: 1. The effects of wind speed, forced vibration amplitude, rise-span ratio and reduced frequency of roof on unstable aerodynamics are discussed by forced vibration wind tunnel test method. The numerical simulation of computational fluid dynamics is used to reproduce the wind tunnel test, so as to analyze the characteristics of unstable aerodynamics in a wider reduced frequency range, and the mechanism of interaction between wind and roof is discussed through the analysis of visual flow field. Conclusion: 1. The vibration of the roof has a great influence on the wind pressure distribution on the surface of the roof. 2. The vibration of the roof may inhibit the shedding of the vortex on the leeward surface of the roof. 3. According to the results of wind tunnel test and numerical simulation, the rise-span ratio, wind speed and vibration amplitude have little effect on the pneumatic damping coefficient and pneumatic stiffness coefficient, and the pneumatic damping coefficient and pneumatic stiffness coefficient mainly change with the reduction frequency. 4. The total stiffness coefficient of the structure is positive, so that the total stiffness of the structure is reduced, thus the natural frequency of the structure is reduced, and the total damping coefficient of the structure is negative, which increases the total damping of the structure. 5. The consistency between wind tunnel test and LES simulation results shows that LES is an effective numerical simulation method which can effectively study the unsteady aerodynamic characteristics.
【作者单位】： School
【基金】：Project supported by the Foundation of Jiangsu Collaborative Innovation Center for Building Energy Saving Construction Technology for Young Teachers(No.SJXTQ1515),China
【分类号】：TU352.2
，
本文编号：2510445
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