Dynamics Near the Subcritical Transition of the 3D Couette Flow II: Above Threshold Case

Dynamics Near the Subcritical Transition of the 3D Couette Flow II: Above Threshold Case
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3D Couette Flow II 亚临界转变附近的动力学:高于阈值情况

DOI:
10.1090/memo/1377
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发表时间:
2022
影响因子:
1.9
通讯作者:
Masmoudi, Nader
Masmoudi, Nader
中科院分区:
数学3区
文献类型:
--
作者:
Bedrossian, Jacob;Germain, Pierre;Masmoudi, Nader

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这是第二个在一对工程,研究小扰动的平面,周期性的三维Couette流在不可压缩的Navier-Stokes方程在高雷诺数Re。在这项工作中,我们表明,有常数,独立于,使足够有规律的扰动的大小为任何存在至少untiland一般演变为由于提升效应。此外,时间之后,解的流向依赖性被混合增强耗散效应迅速减小,并且解被吸引回“2.5维”流向独立解(有时称为“条纹”)类。这些条纹中最大的一条预计最终将在1000 ℃经历二次不稳定。因此,我们的工作强烈建议,对于所有(足够经常)的初始数据,通用性的“提升effectstreak growthstreak breakdown”的情况下,湍流过渡的3D Couette流在应用数学和物理文献中转发的阈值附近的稳定性。
This is the second in a pair of works which study small disturbances to the plane, periodic 3D Couette flow in the incompressible Navier-Stokes equations at high Reynolds number Re. In this work, we show that there is constant, independent of, such that sufficiently regular disturbances of sizefor anyexist at least untiland in general evolve to bedue to the lift-up effect. Further, after times, the streamwise dependence of the solution is rapidly diminished by a mixing-enhanced dissipation effect and the solution is attracted back to the class of “2.5 dimensional” streamwise-independent solutions (sometimes referred to as “streaks”). The largest of these streaks are expected to eventually undergo a secondary instability at. Hence, our work strongly suggests, for all (sufficiently regular) initial data, the genericity of the “lift-up effectstreak growthstreak breakdown” scenario for turbulent transition of the 3D Couette flow near the threshold of stability forwarded in the applied mathematics and physics literature.
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