基于不同数学模型对某弯道式渠首水沙运动的数值模拟对比研究

以新疆某弯道式渠首为研究对象,分别采用CCHE和Fluent建立数学模型,对该渠首水沙运动规律进行数值模拟研究,并将模拟数据与物理模型试验结果进行比较分析。研究结果表明:两种数值模型的计算结果与物理模型结果吻合都较好,但与Fluent模型相比,在水流流态方面,CCHE模型能更准确地反映弯道下段自由水面的横比降现象;在泥沙横向淤积方面,CCHE模型可充分体现环流作用下泥沙冲淤效果;在计算用时方面,CCHE模型也明显耗时更少,证明CCHE模型能够更高效、更准确地模拟预测弯道水沙运动。

Numerical simulation study on flow and sediment movement of a bend canal based on different mathematical models

Taking a certain bend channel head in Xinjiang as the research object, this study uses CCHE and Fluent respectively to establish a mathematical model to study the law of water and sediment movement in the head canal and compare the simulation results with the experimental results of the physical model. The results show that the calculated results of the two numerical models are in good agreement with the physical model results. However, compared with the Fluent model, the CCHE model more closely reflects the horizontal drop phenomenon of the free surface in the lower curve. CCHE model can fully reflect the effect of sediment erosion and deposition under the river bend. CCHE model obviously consumes less time in terms of calculating time, which proves that CCHE model can more effectively and accurately predict the water and sediment movement of the bend channel.