布设丁坝对60°弯道水流特性影响的数值模拟研究
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摘要
分别采用RNG k-ε模型和大涡模型结合气液两相流模型对60°弯道内布设丁坝前后的水流特性进行了数值模拟研究,采用VOF法捕捉自由水面,采用隐式算法SIMPLE(Semi-Implicit Method for Pressure-Linked Equations)求解速度与压力耦合方程组,有限体积法用来离散控制方程。对弯道内的水位、流速、弯道横比降的模拟值与实验值进行了比较分析,得出:大涡模型对弯道内水流流态的模拟精度较低,与之相比,采用RNG k-ε模型能更好地模拟出弯道内布设丁坝前后的流场特性。
With RNG k-εmodel and large eddy model, combining with gas-liquid two-phase flow model, numerical simulation was conducted to study the flow characteristics of a 60°bend before and after designing a groin. Free water surface was captured by VOF method. Coupled equations of velocity and pressure were solved by SIMPLE, i.e.the semi-implicit method for pressure-linked equations. The finite volume method is used to discrete governing equations. The simulation results and testing results of water level, flow velocity and bend transverse gradient were compared, based on which it is concluded that for simulation of bend flow pattern, the accuracy of large eddy model is relatively low while that of RNG k-ε model is better.
With RNG k-εmodel and large eddy model, combining with gas-liquid two-phase flow model, numerical simulation was conducted to study the flow characteristics of a 60°bend before and after designing a groin. Free water surface was captured by VOF method. Coupled equations of velocity and pressure were solved by SIMPLE, i.e.the semi-implicit method for pressure-linked equations. The finite volume method is used to discrete governing equations. The simulation results and testing results of water level, flow velocity and bend transverse gradient were compared, based on which it is concluded that for simulation of bend flow pattern, the accuracy of large eddy model is relatively low while that of RNG k-ε model is better.
引文
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[2]许慧,李国斌,尚倩倩,等.淹没丁坝群二维水流数值模拟新方法[J].水科学进展,2014,25(3):407-413.
[3]宁健,李国栋,马淼.河宽缩窄率对河床冲刷形态影响数值模拟研究[J].水力发电学报,2017,36(8):43-49.
[4]孙瑶,花健灵,常俊德,等.基于弯道流凌影响的丁坝布置形式的数值模拟[J].应用科技,2017,44(3):5-11.
[5]韩晗,张曼,林斌亮,等.连续丁坝回流特性实验研究[J].水力发电学报,2017,36(10):84-92.
[6]钟亮,孙建云,刘珺洁,等.阶梯形丁坝下游回流规律分析[J].水利水运工程学报,2017(5):7-19.
[7]崔占峰,张小峰,冯小香.丁坝冲刷的三维紊流模拟[J].水动力学研究与进展,2008,23(1):33-41.
[8] A.A. Dehghania,H.Md. Azamathullab,S.A. Hashemi Najafi et al. Local scouring around L-head groynes[J]. Journal of Hydrology,2013,50(4):125-131.
[9] Abdul Karim Barbhuiya,Sumit Talukdar. Scour and three dimensional turbulent flow fields measured by ADV at a 90°horizontal forced bend in a rectangular channel[J]. Flow Measurement and Instrumentation,2010(21):312-321.
[10]魏文礼,戴会超.紊流模型理论及工程应用[M].西安:陕西科学技术出版社,2006.
[11]周俊波,刘洋.FLUENT6.3流场分析从入门到精通[M].北京:机械工业出版社,2011.
[12]周阳.丁坝对弯道水流流态影响的试验研究[D].沈阳:沈阳农业大学,2006.