Sustaining processes from recurrent flows in body-forced turbulence

Sustaining processes from recurrent flows in body-forced turbulence
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体强迫湍流中循环流动的维持过程

DOI:
10.1017/jfm.2017.97
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发表时间:
2017
影响因子:
3.7
通讯作者:
Lucas D
Lucas D
中科院分区:
工程技术2区
文献类型:
--
作者:
Lucas D

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通过直接从体强迫三维湍流中提取不稳定的不变解,我们研究了在动量方程或涡量方程中,当强迫是大尺度和单向的时,在起作用的动力学过程。在前一种情况下,动力学过程从线性稳定剪切流的最近工作中熟悉-各种称为自持过程(Waleffe,Phys. Fluids,第9卷(4),1997年,第100页)。883-900)或涡旋-波相互作用(Hall & Smith,J. Fluid Mech.,第227卷,1991年,第227页。641-666; Hall & Sherwin,J. Fluid Mech.,第661卷,2010年,pp. 178-205)-即使在基流线性不稳定时也是重要的。在后一种情况下,强迫驱动泰勒-格林涡,从各种类型的周期性轨道孤立的观察到一些机制。特别是,两种不同的瞬态生长机制进行了讨论,以解释更复杂的状态。
By extracting unstable invariant solutions directly from body-forced three-dimensional turbulence, we study the dynamical processes at play when the forcing is large scale and unidirectional in either the momentum or the vorticity equations. In the former case, the dynamical processes familiar from recent work on linearly stable shear flows – variously called the self-sustaining process (Waleffe, Phys. Fluids, vol. 9 (4), 1997, pp. 883–900) or vortex–wave interaction (Hall & Smith, J. Fluid Mech., vol. 227, 1991, pp. 641–666; Hall & Sherwin, J. Fluid Mech., vol. 661, 2010, pp. 178–205) – are important even when the base flow is linearly unstable. In the latter case, where the forcing drives Taylor–Green vortices, a number of mechanisms are observed from the various types of periodic orbits isolated. In particular, two different transient growth mechanisms are discussed to explain the more complex states found.
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