Abstract
This paper addresses the problem of the renormalization group k - ε turbulence modeling of a vegetated multi-stage compound channel. Results from Micro acoustic Doppler velocimeter (ADV) tests are used with time and spatial averaging (doubleaveraging method) in the analysis of the flow field and the characterization. Comparisons of the mean velocity, the Reynolds stress, and the turbulent energy distribution show the validity of the computational method. The mean velocity profile sees an obvious deceleration in the terraces because of vegetation. Secondary flow exists mainly at the junction of the main channel and the vegetation region on the first terrace. The bed shear stress in the main channel is much greater than that in the terraces. The difference of the bed shear stress between two terraces is insignificant, and the presence of vegetation can effectively reduce the bed shear stress.
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Project supported by the National Natural Science Foundation of China (Grant No. 11372232), the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20130141110016) and the State Water Pollution Control and Management of Major Special Science and Technology (Grant No. 2012ZX07205-005-03).
Biography: WANG Wen (1986-), Male, Ph. D. Candidate
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Wang, W., Huai, Wx. & Gao, M. Numerical investigation of flow through vegetated multi-stage compound channel. J Hydrodyn 26, 467–473 (2014). https://doi.org/10.1016/S1001-6058(14)60053-6
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DOI: https://doi.org/10.1016/S1001-6058(14)60053-6