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Numerical Study of Discharge-Head Relationship of Piano Key Weirs for Low Heads
Water Resources ( IF 1 ) Pub Date : 2021-04-04 , DOI: 10.1134/s0097807821020020
Amiya Abhash , K. K. Pandey

Abstract

Piano Key Weirs (PKW) is a free-flowing weir, and an improvement over the labyrinth weir family. PKW has higher discharge for the same head as compared to other types of weirs. They tend to reduce the upstream submergence in reservoirs or other flow systems and can be effectively used for flood risk mitigation. CFD studies have been carried out earlier but mostly for H/P (Total head to height ratio) greater than 0.1. The present paper investigates the use and validation of Computational Fluid Dynamics (CFD) for modeling Open Channel flows over common hydraulic structures such as PKW for small discharges with the entire range of head to height ratio h/P from 0.035 to 0.1, where h is not the total head upstream of PKW but the head measured at the crest of PKW. The numerical results have been validated with experimental results. Since the discharge is minimal surface tension force has been incorporated in the numerical model. The numerical model is a half PKW unit model with the same geometrical parameters as the experimental setup from Literature. The results show that CFD simulations can reproduce flow depths near PKW with reasonably good accuracy. The present paper compares the head obtained from CFD with that of empirical formula in the Literature but with head measured at the crest of PKW. Investigation of water surface profile and velocity profile near the upstream of PKW has also been carried out.



中文翻译:

低头钢琴键堰的排量头关系数值研究

摘要

钢琴键堰(PKW)是一种自由流动的堰,是对迷宫堰系列的改进。与其他类型的堰相比,PKW在相同扬程下具有更高的流量。它们往往会减少水库或其他流量系统中的上游淹没,并可以有效地用于减轻洪水风险。CFD研究已经进行得较早,但大多数情况下H / P(总身高比)大于0.1。本论文研究了使用和计算流体动力学(CFD)审定用于建模明渠流过共同的液压的结构,例如用于PKW小放电头与高度之比的整个范围ħ / P为0.035〜0.1,这里ħ不是PKW上游的总水头,而是在PKW的波峰处测得的水头。数值结果已通过实验验证。由于放电是最小的,因此表面张力已被包含在数值模型中。数值模型是半PKW单元模型,具有与文献中的实验设置相同的几何参数。结果表明,CFD仿真可以以相当好的精度重现PKW附近的流深。本文比较了从CFD获得的水头与文献中的经验公式的水头,但与在PKW峰值处测量的水头进行了比较。还对PKW上游附近的水面轮廓和速度轮廓进行了研究。

更新日期:2021-04-04
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