A combined experimental/numerical study of unsteady phenomena in a laminar separation bubble

被引：101
|
作者：
Marxen, O [1 ]
Lang, M [1 ]
Rist, U [1 ]
Wagner, S [1 ]
机构：
[1] Univ Stuttgart, IAG, D-70550 Stuttgart, Germany
来源：
FLOW TURBULENCE AND COMBUSTION | 2003年 / 71卷 / 1-4期
关键词：
DNS; instability; LDA; PIV; separation; transition;
D O I：
10.1023/B:APPL.0000014928.69394.50
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A laminar boundary layer separates in a region of adverse pressure gradient on a flat plate and undergoes transition. Finally the turbulent boundary layer reattaches, forming a laminar separation bubble (LSB). Laminar-turbulent transition within such a LSB is investigated by means of Laser-Doppler-Anemometry (LDA), Particle Image Velocimetry (PIV), and direct numerical simulation (DNS). The transition mechanism occurring in the flow-field under consideration is discussed in detail. Observations for the development of small disturbances are compared to predictions from viscous linear instability theory (Tollmien-Schlichting instability). Non-linear development of these disturbances and their role in final breakdown to turbulence is analyzed.
引用
收藏
页码：133 / 146
页数：14
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