The Flow Around Surface-Mounted, Prismatic Obstacles Placed in a Fully Developed Channel Flow (Data Bank Contribution)

[+] Author and Article Information
R. Martinuzzi, C. Tropea

Lehrstuhl für Strömungsmechanik, Universität Erlangen-Nürnberg, D-8520 Erlangen, Germany

J. Fluids Eng 115(1), 85-92 (Mar 01, 1993) (8 pages) doi:10.1115/1.2910118 History: Received February 28, 1992; Online May 23, 2008


The flow field around surface-mounted, prismatic obstacles with different spanwise dimensions was investigated using the crystal violet, oil-film and laser-sheet visualization techniques as well as by static pressure measurements. The aim of this study is to highlight the fundamental differences between nominally two-dimensional and fully three-dimensional obstacle flows. All experiments were performed in a fully developed channel flow. The Reynolds number, based on the height of the channel, lay between 8 × 104 and 1.2 × 105 . Results show that the middle region of the wake is nominally two-dimensional for width-to-height ratios (W/H) greater than 6. The separated region in front of wider obstacles is characterized by the appearance of a quasi-regular distribution of saddle and nodal points on the forward face of the obstacles. These three-dimensional effects are considered to be inherent to such separating flows with stagnation.

Copyright © 1993 by The American Society of Mechanical Engineers
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