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arXiv 2104.08652physics.flu-dyn
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涡周围应变主导区对诱导气动载荷的意义

Significance of the strain-dominated region around a vortex on induced aerodynamic loads

Karthik Menon, Rajat Mittal

摘要:

涡流在近端表面上诱导气动载荷的能力在各种流动中起着重要作用。然而,大多数涡致效应的研究主要集中在分析旋转占主导地位的涡核的影响。在这项工作中,我们表明,不仅是由应变主导的区域所包围的粘性流中的涡,但这些区域是动态的重要性,有时甚至可以决定诱导的气动载荷。我们证明了这一点的俯仰翼型,表现出动态失速,并产生几个力诱导涡。使用数据驱动的力分割方法,我们量化的影响,以及涡相关的应变表明,我们目前的理解涡为主的现象,如动态失速,是不完整的,不考虑与涡相关的应变为主的区域的实质性影响。

英文摘要:

The ability of vortices to induce aerodynamic loads on proximal surfaces plays a significant role in a wide variety of flows. However, most studies of vortex-induced effects primarily focus on analyzing the influence of the rotation-dominated cores of vortices. In this work, we show that not only are vortices in viscous flows surrounded by strain-dominated regions, but that these regions are dynamically important and can sometimes even dictate the induced aerodynamic loads. We demonstrate this for a pitching airfoil, which exhibits dynamic stall and generates several force-inducing vortices. Using a data-driven force partitioning method, we quantify the influence of vortices as well as vortex-associated strain to show that our current understanding of vortex-dominated phenomena, such as dynamic stall, is incomplete without considering the substantial effect of strain-dominated regions that are associated with vortices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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