Secondary instability of roughness-induced transient growth

被引：34

作者：

Denissen, Nicholas A. ^{[1
]}

White, Edward B. ^{[2
]}

机构：

[1] Los Alamos Natl Lab, X Computat Phys Div, Los Alamos, NM 87545 USA

[2] Texas A&M Univ, Dept Aerosp Engn, College Stn, TX 77843 USA

来源：

PHYSICS OF FLUIDS | 2013年 / 25卷 / 11期

关键词：

PLATE BOUNDARY-LAYER; BYPASS TRANSITION; OPTIMAL PERTURBATIONS; OPTIMAL DISTURBANCES; ELEMENTS; FLOW; STREAKS; STABILITY; VORTICES; SURFACE;

D O I：

10.1063/1.4829482

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Calculations are performed to analyze the stability of steady roughness-induced transient growth to unsteady fluctuations. The basic states consist of an optimal transient growth model and a previously computed direct numerical simulation that fully resolves the three-dimensional roughness element. It is shown that sub-optimal transient growth produced by surface roughness is much more susceptible to destabilization than optimal perturbation predictions. The factors contributing to this behavior are analyzed in detail. Scaling properties from experiments allow computation of stability bounds for realistic surface roughness. These results are also used to explain the critical behavior seen in transition behind three-dimensional roughness elements. (C) 2013 AIP Publishing LLC.

引用

页数：18

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