明渠中后台阶湍流的数值分析

Q4 Environmental Science
Bala Kawa M. Saleem, Andam Mustafa, Dalshad Ahmed Kareem, M. Yuce, M. Szydłowski, Nadhir Al-Ansari
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引用次数: 0

摘要

摘要在水深为1.5 m的条件下,对具有单个后向台阶(BFS)的明渠流场进行了计算试验。在计算流体动力学(CFD)模拟中,采用1.5和2两种不同的膨胀比,以及0.5、1、2、3、4、5、7.5和10 m/sec 8种不同的流速,研究了膨胀比和沿再附着长度流速的影响。使用市售的CFD软件ANSYS FLUENT进行计算。用实验结果验证了仿真结果。此外,采用两种方程湍流闭合模型进行了分析,K- ε族(标准、RNG和可实现)和K-ω族(Wilcox 's和SST K-ω)。分析表明,再附着长度随膨胀比、流速和雷诺数的增大而增大。在两种膨胀率和八种不同流速下得到的结果表明,一种湍流闭合模型与其他模型之间的差异不显著。此外,还观察到速度和膨胀比对再附着区大小都有影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Analysis of Turbulent Flow over a Backward-facing Step in an Open Channel
Abstract Computational examinations of the flow field in an open channel having a single Backward--Facing Step (BFS) with a constant water depth of 1.5 m were performed. The e ects of the expansion ratio, and the flow velocity along the reattachment length, were investigated by employing two di erent expansion ratios of 1.5 and 2, and eight various flow velocities of 0.5, 1, 2, 3, 4, 5, 7.5 and 10 m/sec in the Computational Fluid Dynamic (CFD) simulations. Commercially available CFD software, ANSYS FLUENT, was used for calculations. The simulation outcomes were verified using experimental results. Moreover, analyses were performed by using two equation turbulence closure models, K-ɛ family (standard, RNG and realizable), and K-ω family (Wilcox’s and SST K-ω). The analyses have revealed that the reattachment length increases with an increase in the expansion ratio, the flow velocity and the Reynolds number. The results obtained for two expansion rates and eight di erent flow velocities have shown insignificant di erences between one turbulence closure model and the others. Furthermore, it was observed that both velocity and expansion ratios have an e ect on the reattachment zone size.
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来源期刊
Archives of Hydroengineering and Environmental Mechanics
Archives of Hydroengineering and Environmental Mechanics Environmental Science-Water Science and Technology
CiteScore
1.30
自引率
0.00%
发文量
4
期刊介绍: Archives of Hydro-Engineering and Environmental Mechanics cover the broad area of disciplines related to hydro-engineering, including: hydrodynamics and hydraulics of inlands and sea waters, hydrology, hydroelasticity, ground-water hydraulics, water contamination, coastal engineering, geotechnical engineering, geomechanics, structural mechanics, etc. The main objective of Archives of Hydro-Engineering and Environmental Mechanics is to provide an up-to-date reference to the engineers and scientists engaged in the applications of mechanics to the analysis of various phenomena appearing in the natural environment.
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