Turbulent pipe flow downstream of a 90° bend

被引：0

作者：

Hellström, Leo H.O. ^{[1
]}

Zlatinov, Metodi B. ^{[1
]}

Cao, Guangjun ^{[2
]}

Smits, Alexander J. ^{[1
,3
]}

机构：

[1] Mechanical and Aerospace Engineering, Princeton University, Princeton,NJ,08544, United States

[2] CARDC, PO Box 211, Mianyang, Sichuan,621000, China

[3] Mechanical and Aerospace Engineering, Monash University, VIC,3800, Australia

来源：

Journal of Fluid Mechanics | 2013年 / 735卷

关键词：

Principal component analysis - Boundary layer flow - Stereo image processing - Velocity measurement - Boundary layers - Vortex flow - Turbulent flow;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Time-resolved stereoscopic PIV was used to investigate the curvature-induced structures downstream of a 90° bend at Reynolds numbers between 20× 103 and 115× 103. Data were taken at three downstream locations to investigate the evolution of the structures. Snapshot proper orthogonal decomposition (POD) analysis shows that the most energetic structure is not the well-known Dean motion but a bimodal single cell structure with alternating direction of rotation, called the 'swirl switching' mode. The strengths of the Dean motion and the swirl-switching structures are similar, indicating that the difference in energy is related to their duration of occurrence, where the Dean motion is associated with a comparatively rapid transition between the two states in the swirl switching mode. © 2013 Cambridge University Press.

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