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Three-Dimensional Numerical Simulation and Analysis of Flows around a Submerged Weir in a Channel Bendway |
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| Authors: | Yafei Jia Steve Scott Yichun Xu Suiliang Huang Sam S. Y. Wang |
| Affiliation: | 1Research Associate Professor, National Center for Computational Hydroscience and Engineering, The Univ. of Mississippi, University, MS 38677. E-mail: jia@ncche.olemiss.edu 2U.S. Army Corps of Engineers, Engineering Research and Development Center, Coastal and Hydraulic Laboratory, Vicksburg, MS. E-mail: Steve.H.Scott@erdc.usace.army.mil 3Research Scientist, National Center for Computational Hydroscience and Engineering, The Univ. of Mississippi, University, MS 38677. E-mail: xu@ncche.olemiss.edu 4Visiting Research Associate, National Center for Computational Hydroscience and Engineering, The Univ. of Mississippi, MS 38677. 5Frederick A.P. Barnard Professor, Director, National Center for Computational Hydroscience and Engineering, The Univ. of Mississippi, University, MS 38677. E-mail: wang@ncche.olemiss.edu |
| Abstract: | To improve navigation conditions for barges passing through river channels, many submerged weirs (SWs) have been installed along the bendways of many waterways by the U.S. Army Corps of Engineers. This paper presents results from three-dimensional numerical simulations that were conducted to study the helical secondary current (HSC) and the near-field flow distribution around one SW. The simulated flow fields around a SW in a scale physical model were validated using experimental data. The three-dimensional flow fields around a SW, the influence of the SW on general HSC, and the implication of effectiveness of submerged weirs to realign the flow field and improve navigability in bendways were analyzed. The numerical simulations indicated that the SW significantly altered the general HSC. Its presence induced a skewed pressure difference cross its top and a triangular-shaped recirculation to the downstream side. The over-top flow tends to realign toward the inner bank and therefore improves conditions for navigation. |
| Keywords: | Numerical analysis Flow simulation Secondary flow Turbulent flow Three-dimensional models Channel bends Hydraulic structures Weirs |