IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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| Fundamental study on generation mechanism of inner secondary flow in a corner formed by a vertical wall and a free surface |
| Author : |
Shun-Ichiro Hayashi, Terunori Ohmoto, Itsuro Honda, Ryu-ichi Hirakawa |
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A fully-developed turbulent open-channel flow was computed to clarify the generation mechanism of inner secondary flow in a mixed-boundary corner formed by a vertical wall and a free surface using direct numerical simulation (DNS). The Reynolds number for the simulations was Reτ=150 and the aspect ratio of channel width to flow depth was 2. The maximum-velocity-dip phenomena and stable secondary currents were reasonably reproduced. The significant results were the identification of inner secondary flow which rotates toward the wall at the free surface and down away from the surface along the wall. Then, in this paper, the Reynolds momentum equations were analyzed to discuss the generation mechanism. Detailed evaluation of Reynolds stress terms and pressure terms revealed that the imbalance between them causes the inner secondary flow.
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| File Size : |
552,420 bytes |
| File Type : |
Adobe Acrobat Document |
| Chapter : |
IAHR World Congress Proceedings
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| Category : |
32nd Congress - Venice (2007)
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| Article : |
THEME B: Data Acquisition and Processing For Scientific Knowledge and Public Awareness.
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| Date Published : |
01/07/2007 |
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