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

被引：106

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

页码：133 / 146

页数：14

共 17 条

[1] Direct numerical simulation of 'short' laminar separation bubbles with turbulent reattachment [J].