Numerical Study of Hydraulic Jump on Rough Beds Stilling Basins
Numerical Study of Hydraulic Jump on Rough Beds Stilling Basins
复制标题
粗床消力池水跃数值研究
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Abbaspour
中科院分区：
文献类型：
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作者：
S. Ebrahimi;F. Salmasi;A. Abbaspour
水跃现象是明渠中最常见的现象之一。水跃是通过消耗大量能量而从超临界流快速转变为亚临界流的过程。消力池底糙率是控制、减小水跃长度、增加水跃能量损失的重要因素。本文采用标准k-ε模型对三角形和矩形粗糙面上的水跃进行了二维数值模拟。使用VOF方法确定自由表面。共16模拟弗劳德数从3到7的范围内进行了模拟。结果表明，与经典水跃相比，水跃的跃深和跃长减小，能量损失增大。模型计算结果与实验数据吻合较好。研究得出了一些经验关系式，用于确定粗糙床上不同水流条件下的水深和床面切应力。
The hydraulic jump phenomenon is one of the most common phenomena in open channels. A hydraulic jump is a rapid transition from a supercritical flow into a subcritical flow by dissipating a lot of energy. Stilling basins bottom roughness is an important factor to control, reducing jump length and increase energy losses by hydraulic jump. In present study, 2-dimensional numerical simulation of hydraulic jump on rough beds including triangular and rectangular sheets by using standard k-e model was evaluated. The free surface was determined using the VOF method. Total of 16 simulations were simulated for a range of the Froude number from 3 to 7. The results showed that the sequent depth and length of hydraulic jump are reduced while the energy loss is increased, comparing with classic jump. Also there was a good agreement between modelled results and experimental data. The investigation resulted in some empirical relations to define the sequent depth and bed shear stress for different flow conditions on used rough beds.