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首页> 外文期刊>Physics of fluids >Codimension three bifurcation of streamline patterns close to a no-slip wall: A topological description of boundary layer eruption
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Codimension three bifurcation of streamline patterns close to a no-slip wall: A topological description of boundary layer eruption

机译:靠近防滑壁的流线模式的三维分叉:边界层喷发的拓扑描述

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摘要

A vortex close to a no-slip wall gives rise to the creation of new vorticity at the wall. This vorticity may organize itself into vortices that erupt from the separated boundary layer. We study how the eruption process in terms of the streamline topology is initiated and varies in dependence of the Reynolds number Re. We show that vortex structures are created in the boundary layer for Re around 600, but that these disappear again without eruption unless Re > 1000. The eruption process is topologically unaltered for Re up to 5000. Using bifurcation theory, we obtain a topological phase space for the eruption process, which can account for all observed changes in the Reynolds number range we consider. The bifurcation diagram complements previously analyzes such that the classification of topological bifurcations of flows close to no-slip walls with up to three parameters is now complete. (C) 2015 AIP Publishing LLC.
机译:靠近防滑壁的涡流会在壁上产生新的涡流。这种涡旋可将其自身组织成从分离的边界层喷出的涡旋。我们研究如何根据流线拓扑启动喷发过程,并根据雷诺数Re改变喷发过程。我们表明,在大约600的Re边界层中创建了涡旋结构,但是除非Re> 1000,否则它们会再次消失而不会喷发。对于Re高达5000,喷发过程在拓扑上没有改变。使用分叉理论,我们获得了拓扑相空间对于喷发过程,可以解释我们考虑的雷诺数范围内所有观察到的变化。分叉图是对先前分析的补充,以至于现在完成了具有多达三个参数的接近防滑壁的流动拓扑分叉的分类。 (C)2015 AIP Publishing LLC。

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