Transition from undular jump to breaking jump

IF 1.7 3区工程技术 Q3 ENGINEERING, CIVIL

Journal of Hydraulic Research Pub Date : 2023-09-25 DOI:10.1080/00221686.2023.2239188

Manoj Langhi, Takashi Hosoda

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引用次数: 0

Abstract

ABSTRACTIn the present study, a one-dimensional governing equation with a vertical acceleration term is used to analyse the free surface profile of various types of jumps. Initially, the surface profile of various types of jumps are reproduced analytically by using a suitable eddy diffusivity term. The approximations of the surface profile for various jumps are then verified numerically. Based on the comparisons, an empirical relationship between the Froude number and the turbulent diffusivity coefficient is established. The proposed empirical relationship is used in the governing equation to compute the various jumps, where an implicit two dimensional flow is assumed. The obtained results are compared with the experimental data to assure the transition of flow from undular jump to breaking jump. The comparisons of numerical results of wave profiles, pressure distribution, wave length and wave amplitude with the existing experimental data for various Froude numbers indicated the suitability of the proposed empirical relationship. Finally, the transitions of flow from undular jump to breaking hydraulic jump are discussed.Keywords: Froude numberhydraulic jumpopen channel flowsurface profileundular jump

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从波浪形跳跃过渡到突破跳跃

摘要本文采用一个带垂直加速度项的一维控制方程来分析各种类型跳跃的自由表面轮廓。首先，利用合适的涡扩散系数项解析再现了各种类型跳变的表面轮廓。然后用数值方法验证了各种跳跃的表面轮廓的近似。在此基础上，建立了弗劳德数与湍流扩散系数之间的经验关系。所提出的经验关系在控制方程中用于计算各种跳跃，其中假设隐含的二维流动。将所得结果与实验数据进行了比较，以保证流动从波浪跃变到破跃变。将不同弗劳德数下的波浪剖面、压力分布、波长和波幅的数值结果与已有的实验数据进行了比较，表明了所提经验关系的适用性。最后，讨论了水流从波浪跃变到破裂跃变的过程。关键词:弗劳德数;液压跳井;流道

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来源期刊

Journal of Hydraulic Research 工程技术-工程：土木

CiteScore

4.90

自引率

4.30%

发文量

审稿时长

6.6 months

期刊介绍： The Journal of Hydraulic Research (JHR) is the flagship journal of the International Association for Hydro-Environment Engineering and Research (IAHR). It publishes research papers in theoretical, experimental and computational hydraulics and fluid mechanics, particularly relating to rivers, lakes, estuaries, coasts, constructed waterways, and some internal flows such as pipe flows. To reflect current tendencies in water research, outcomes of interdisciplinary hydro-environment studies with a strong fluid mechanical component are especially invited. Although the preference is given to the fundamental issues, the papers focusing on important unconventional or emerging applications of broad interest are also welcome.