Stability of wall-bounded shear layers in the presence of simulated distributed surface roughness
Stability of wall-bounded shear layers in the presence of simulated distributed surface roughness
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DOI：
10.1017/s0022112096004429
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发表时间：
1997-03
影响因子：
3.7
通讯作者：
J. M. Floryan
中科院分区：
文献类型：
--
作者：
J. M. Floryan
考虑了受分布吸力修正的有壁剪切层的线性稳定性。为了模拟分布表面粗糙度，引入了壁面吸力。在所研究的所有情况下，即Poilluille和Couette流动和Blasius边界层，壁面抽吸能够引起一种新型的不稳定性，其特征在于流向涡的出现。计算结果表明，一个线性模型的吸力引起的流动修改提供了一个足够准确的基本状态的代表。因此，可以通过将任意吸力分布分解为傅立叶级数并在逐个模态的基础上进行稳定性分析（即，一劳永逸）来评估该分布的影响。
Linear stability of wall-bounded shear layers modified by distributed suction has been considered. Wall suction was introduced in order to simulate distributed surface roughness. In all cases studied, i.e. Poiseuille and Couette flows and Blasius boundary layer, wall suction was able to induce a new type of instability characterized by the appearance of streamwise vortices. Results of calculations show that a linear model of suction-induced flow modifications provides a sufficiently accurate representation of the basic state. The effects of an arbitrary suction distribution can, therefore, be assessed by decomposing this distribution into Fourier series and carrying out stability analysis on a mode-by-mode basis, i.e. once and for ever.