Sustaining processes from recurrent flows in body-forced turbulence
Sustaining processes from recurrent flows in body-forced turbulence
复制标题
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
中科院分区:
文献类型:
--
作者:
Lucas D
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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