On the decay of dispersive motions in the outer region of rough-wall boundary layers
On the decay of dispersive motions in the outer region of rough-wall boundary layers
复制标题
粗壁边界层外部区域色散运动的衰减
DOI:
10.1017/jfm.2018.1019
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发表时间:
2019
影响因子:
3.7
通讯作者:
Meyers J
中科院分区:
文献类型:
--
作者:
Meyers J
In rough-wall boundary layers, wall-parallel non-homogeneous mean-flow solutions exist that lead to so-called dispersive velocity components and dispersive stresses. They play a significant role in the mean-flow momentum balance near the wall, but typically disappear in the outer layer. A theoretical framework is presented to study the decay of dispersive motions in the outer layer. To this end, the problem is formulated in Fourier space, and a set of governing ordinary differential equations per mode in wavenumber space is derived by linearizing the Reynolds-averaged Navier–Stokes equations around a constant background velocity. With further simplifications, analytically tractable solutions are found consisting of linear combinations of .
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