Discharge measurement and control structures are widely employed in hydraulic engineering applications. The objective of this study is to numerically investigate the modelling of two different structures, namely sharp‐crested weirs as Problem 1 and combined weir and gate systems as Problem 2. The research methodology herein is based on the comparison of results of numerical simulations with experimental data for both problems separately. For the purpose of performing numerical simulations, the Reynolds‐averaged Navier–Stokes (RANS) equations are solved by finite volume formulation using commercially available Flow‐3D software. Assessment of empirical data and numerical findings for both problems reveals that discharge rates agree reasonably well. In addition, using the capabilities of numerical modelling, weir and gate discharge coefficients in the combined system are calculated separately which were not easy to obtain in experimental studies. It is seen that gate and weir discharge coefficients of the combined system are different and higher than the corresponding coefficients of the individual systems. © 2020 John Wiley & Sons, Ltd.

中文翻译：

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收缩尖顶堰和堰门组合系统的数值模拟

流量测量和控制结构广泛用于水利工程应用。本研究的目的是对两种不同结构的建模进行数值研究，即问题1的尖顶堰和问题2的堰门系统组合。本文的研究方法基于数​​值模拟结果与实验结果的比较两个问题的数据分别。为了进行数值模拟，使用市售的Flow-3D软件通过有限体积公式求解了雷诺平均Navier-Stokes（RANS）方程。对这两个问题的经验数据和数值结果的评估表明，排放率相当吻合。此外，利用数值建模的功能，组合系统中的堰和栅放电系数是分别计算的，在实验研究中不容易获得。可以看出，组合系统的浇口和堰排放系数是不同的，并且高于各个系统的相应系数。分级为4 +©2020 John Wiley＆Sons，Ltd.