EFFECTS OF A SHARP BEND ON DAM-BREAK FLOW

机译：大幅弯曲对DAM-BREAK流量的影响

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Forecasting the exact velocity and thus the arrival time of a dam-break wave is a keyissue of risk assessment, and quite difficult to achieve especially in natural valleyswith complex geometry. In this paper, two dam-break experiments are presented,whereby the effects of a sharp bend on the dam-break flow were studied. Thelaboratory experiments consisted of a dam break in a channel with a respectively 90°an 45° bend and were carried out in the Civil Engineering Department Laboratory ofthe Université catholique de Louvain (UCL, Belgium). The measured flow iscompared with a numerical simulation by a Boltzmann finite-volume model, and goodagreement is obtained in both the 90° and 45° bend cases. It is then shown how thebend influences the flow, as well upstream and downstream, by means of the dambreakfront characteristic. Upstream, the formation of a bore travelling back to thereservoir leads to an important rise of the water level. Downstream, the local slowingof the wave clearly appears, as well as the dependence upon the sharpness of thebend.

机译：预测溃坝波的确切速度和到达时间是风险评估的关键问题，尤其是在几何形状复杂的天然山谷中，这是很难实现的。本文提出了两个溃坝实验，研究了急弯对溃坝流量的影响。实验室实验由分别在90°和45°弯曲的河道中的溃坝组成，并在卢瓦尔大学天主教大学土木工程系实验室（比利时UCL）进行。测得的流量与Boltzmann有限体积模型的数值模拟进行了比较，并且在90°和45°弯曲情况下均获得了良好的一致性。然后通过水坝溃决特征显示了弯曲如何影响水流以及上游和下游。在上游，形成一个向水库运回的钻孔导致水位大幅上升。在下游，明显出现波浪的局部减慢，以及对弯曲锐度的依赖性。

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《Congress of the International Association for Hydraulics Research;Biennial congress of the International Association for Hydraulics Research》|1999年|p.1-7|共7页
会议地点 Graz(AT);Graz(AT)
作者
S. SOARES FRAZ?O; Y. ZECH;
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Civil Engineering Department Université catholique de LouvainVinci - Place du Levant 1 B-1348 Louvain-la-NeuveTel : +32-10-47 21 24 Fax : +32-10-47 21 79 soares@gc.ucl.ac.be;

Civil Engineering Department Université catholique de LouvainVinci - Place du Levant 1 B-1348 Louvain-la-NeuveTel : +32-10-47 21 24 Fax : +32-10-47 21 79;

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关键词
dam break; ; bend; ; physical model; ; hydraulic jump; ; bore;

机译：溃坝;弯曲; ;物理模型;液压跳跃;无聊;

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1. Modeling dam-break flows in channels with 90 degree bend using an alternating-direction implicit based curvilinear hydrodynamic solver [J] . Wood Amanda, Wang Keh-Han Computers & Fluids . 2015,第Null期

机译：使用交替方向基于隐式的曲线水动力求解器模拟90度弯曲通道中的溃坝流
2. Experimental and Numerical Investigation on Vanes' Effects on the Flow Characteristics in Sharp 60° Bends [J] . Akhtari Ali Akbar, Seyedashraf Omid KSCE journal of civil engineering . 2018,第4期

机译：叶片对尖锐60°弯曲流动特性影响的实验和数值研究
3. Unchannelized dam-break flows: Effects of the lateral spreading on the flow dynamics [J] . Girolami L., Wachs A., Vinay G. Physics of fluids . 2013,第4期

机译：无沟渠溃坝水流：横向扩展对水流动力学的影响
4. EFFECTS OF A SHARP BEND ON DAM-BREAK FLOW [C] . S. SOARES FRAZ?O, Y. ZECH Biennial congress of the International Association for Hydraulics Research . 1999

机译：尖锐弯曲对坝断流的影响
5. Use of vanes in sharp bends to improve open-channel flow characteristics: Laboratory and numerical experiments. [D] . Han, Sang soo. 2010

机译：在急转弯中使用叶片以改善明渠流动特性：实验室和数值实验。
6. Revisiting the Anomalous Bending Elasticity of Sharply Bent DNA [O] . Peiwen Cong, Liang Dai, Hu Chen, 2015

机译：重新审视急剧弯曲的DNA的异常弯曲弹性
7. Computations of open channel flows in a shallow sharp bend using depth-averaged 2D models with secondary flow effects [O] . Fei YANG, Ichiro KIMURA, Yasuyuki SHIMIZU, 2016

机译：使用具有二次流量效果的深度平均的2D模型，在浅锐弯曲中的开放通道的计算流动

EFFECTS OF A SHARP BEND ON DAM-BREAK FLOW

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