On the linear stability of swept attachment-line boundary layer flow. Part 1. Spectrum and asymptotic behaviour

被引:20
|
作者
Obrist, D [1 ]
Schmid, PJ [1 ]
机构
[1] Univ Washington, Dept Appl Math, Seattle, WA 98195 USA
关键词
D O I
10.1017/S0022112003005779
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The temporal stability of swept attachment-line boundary layer flow based on a swept Hiemenz flow model is studied. Starting from the global stability problem and motivated by analytical free-stream solutions, a Hermite expansion is employed in the chordwise coordinate direction which results in coupled local stability problems: A complete study of the temporal spectrum is presented and the discrete and continuous modes are classified according to their symmetry, chordwise polynomial order and asymptotic decay. Uniform, Gortler-Hammerlin and higher-order modes are described in detail. Estimates are given for the location of the continuous spectrum, and bounds are derived for the validity of the linear approximation.
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页码:1 / 29
页数:29
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