低Fr数宽尾墩消力池流场的三维数值模拟.docVIP

低Fr数宽尾墩消力池流场的三维数值模拟 周喜德2，殷彤1*，雷云华3，牛志攀*1，张建民1 （1、水力学与山区河流开发保护国家重点实验室（四川大学），成都，610065） （2、成都理工大学，成都，610059） （3、中国水电顾问集团成都勘测设计研究院，成都，610000） 摘要: 宽尾墩消力池在许多工程中得到应用，而低Fr数宽尾墩消力池内部流场较为复杂，实验结合数值模拟旨在达到工程中体型优化的目的。针对实验观察难以获得详细的各项水力参数的问题，本文采用RNGk-ε紊流模型结合自由面追踪的VOF方法对低Fr数宽尾墩消力池内部流场进行了数值模拟，获得了水流形态，流速分布和紊动能分布特性。两种体型消力池内水位沿程分布、临底流速等水力学参数的计算值与试验值吻合良好，说明本文中数值模拟是稳定可靠的。对比两种方案的水流形态及流场特性发现，推荐体型消力池流场稳定性较好，水流无横向流动，运行方式灵活，并获得了模型试验难以测量的流场详细信息，结果令人满意。 关键词：紊流数值模拟；VOF法；流场；宽尾墩；消力池；体型优化 3D Numerical Simulation of Turbulent Flow with Lower Fr Number in Stilling Basin with Flaring Gate Pier Zhou Xide2, Yin Tong1*, Lei Yunhua3, Niu Zhipan1, Zhang Jianmin1 (1. State Key Lab. of Hydraulics and Mountain River Engineering, Sichuan University ,Chengdu Sichuan 610065;) (2. Chengdu University of Technology, Chengdu Sichuan 610059) (3. Hydrochina Chengdou Engineering Corporation, Chengdu Sichuan 610072) Abstract: Flaring gate pier was used in many practical engineering, while the flow field is very complex in the stilling basin with low Fr number. In this paper, the RNG k-εturbulent model with VOF method was used to simulate the flow in stilling basin with flaring gate pier, which is served for shape optimization of engineering application. The Fr Number of this flow is no more than 3.0. The calculated result was well agree with the experimental result. Characteristics of hydraulic and turbulent kinetic energy of the flow were simulated and analyzed aim at two different geometry of stilling basin. It is hard to measure these mentioned hydraulic characteristics detailedly in physical model, and the measurement error was not avoided. The flow field of the recommend shape is more steady, without transverse flow, and the operational ways of which is more flexible. This kind of numerical simulation, when applied in aspect of the design of discharge structure, possesses obvious advantages. Key Words: Turbulent numerical simulation; VOF; Hydraulic characteristics; Stilling basin; Flaring gate pier; Shape optimizat