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arXiv 1503.06226physics.flu-dynnlin.PS
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有壁剪切流中的层流-湍流模式:Galerkin模型

Laminar-turbulent patterning in wall-bounded shear flows: a Galerkin model

K. Seshasayanan, P. Manneville

摘要:

在走向湍流的过程中,平面库埃特流--反向平移的平行板之间的流动--显示出令人困惑的稳定斜层流湍流模式。我们通过纳维-斯托克斯方程的Galerkin模型来处理这个问题。水动力场的壁面法线依赖性通过精确拟合边界条件的函数基展开来处理。这产生了一组偏微分方程的时空动力学的平面上的流动。截断这一组超出最低非平凡的顺序数值显示,产生预期的模式,因此提高了在粗糙的有效壁法线分辨率。开放的方法的观点进行了讨论。

英文摘要:

On its way to turbulence, plane Couette flow - the flow between counter-translating parallel plates - displays a puzzling steady oblique laminar-turbulent pattern. We approach this problem via Galerkin modelling of the Navier-Stokes equations. The wall-normal dependence of the hydrodynamic field is treated by means of expansions on functional bases fitting the boundary conditions exactly. This yields a set of partial differential equations for the spatiotemporal dynamics in the plane of the flow. Truncating this set beyond lowest nontrivial order is numerically shown to produce the expected pattern, therefore improving over what was obtained at cruder effective wall-normal resolution. Perspectives opened by the approach are discussed.

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