Influence of a Modified Weir Profile on Velocity Field and Dissipation Rate in Stepped Spillways: A Comparative Study Using Physical Models and Computational Fluid Dynamics

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-07-03 DOI:10.47176/jafm.17.9.2572

†. H.Souli, J. Ahattab, S. Bensallam

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Abstract

Stepped spillways are specialized hydraulic structures crafted to optimize the effective dissipation of hydraulic energy along stepped chutes. The central objective is to scrutinize and improve the mitigation of flow separation occurring from the ogee crest to the stepped chute, focusing on various profiles within the critical zone (CZ) to understand its flow behavior. The study evaluates the impact of CZ profile alterations on velocity distribution, revealing a reduction in velocity ranging from 10% to 18% for nappe flow and 7% to 15% for skimming flow, with a dissipation rate 5% higher than other tested profiles in the CZ. By combining physical experiments and numerical simulations, the research aims to understand the complex dynamics of CZ flow. A comparative analysis is conducted, comparing turbulence models (specifically RNG) against experimental data for velocity and dissipation rate, considering different numbers of steps (N=16, 22, 56, 60). Moreover, the research seeks to unravel the effects of introducing additional steps within the CZ on crucial hydraulic parameters. The results indicate a significant improvement in flow patterns, velocity fields, and energy dissipation for the modified profile, highlighting the practical applicability of the proposed approaches in effectively sizing the CZ.

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阶梯式溢洪道中修正堰廓对流速场和耗散率的影响：使用物理模型和计算流体力学的比较研究

阶梯式溢洪道是一种专门的水力结构，旨在优化沿阶梯滑道的水力能量的有效消散。研究的核心目标是仔细检查并改进从楔形坡顶到阶梯式滑道的水流分离缓解措施，重点关注临界区（CZ）内的各种剖面，以了解其水流行为。研究评估了临界区剖面改变对流速分布的影响，结果表明，纳普流的流速降低了 10% 至 18%，撇流的流速降低了 7% 至 15%，消散率比临界区内其他测试剖面高出 5%。通过将物理实验和数值模拟相结合，该研究旨在了解 CZ 流的复杂动态。研究进行了对比分析，将湍流模型（特别是 RNG）与速度和耗散率的实验数据进行了比较，并考虑了不同的阶数（N=16、22、56、60）。此外，研究还试图揭示在 CZ 内引入额外台阶对关键水力参数的影响。结果表明，修改后的剖面在流动模式、速度场和能量耗散方面都有明显改善，突出表明了所建议的方法在有效确定 CZ 大小方面的实际适用性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.