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Numerical simulation of air-water two-phase flow over stepped spillways

Science china(Technological Sciences) 2006年第6期49卷 674-684页

作者： cheng xiangju1, chen yongcan1 & luo lin2.1. department of hydraulic engineering, Tsinghua University,{2., china 2. State Key Laboratory of hydraulics and Mountain River engineering, Sichuan University, chengdu 610065, china department of hydraulic{2. Tsinghua University Beijing 100084 China State Key Laboratory of hydraulics Mountain River engineering Sichuan University Chengdu 610065 China

Stepped spillways for significant energy dissipation along the chute have gained interest; popularity among researchers; dam engineers. Due to the complexity of air-water two-phase flow over stepped spillways, the finite volume computational fluid dynamics module of the FLUENT software was used to simulate the main characteristics of the flow. Adopting the RNG k- turbulence model, the mixture flow model for air-water two-phase flow was used to simulate the flow field over stepped spillway with the PISO arithmetic technique. The numerical result successfully reproduced the complex flow over a stepped spillway of an experiment case, including the interaction between entrained air bubbles; cavity recirculation in the skimming flow regime, velocity distribution; the pressure profiles on the step surface as well. The result is helpful for understanding the detailed information about energy dissipation over stepped spillways.

关键词： stepped spillway, mixture model, RNG k-εmodel, air-water two-phase flow.

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RE-AERATION LAW OF WATER FLOW OVER SPILLWAYS

引用

Journal of Hydrodynamics 2006年第2期18卷 231-236页

作者： cheng Xiang-ju luo {2. chen Yong-can ZHAO Wen-qian department of hydraulic{2. Tsinghua University Beijing 100084 China State Key Laboratory of hydraulics and Mountain River engineering Sichuan University Chengdu 610065China departmentof hydraulic{2. Tsinghua University Beijing 100084 China

In order to explore the re-aeration law of water flow over spillway, the transfer process of oxygen in water flow over spillway was studied. The interfacial mass transfer coefficients were obtained by experiments. The flow fields and the turbulence characteristics are simulated by numerical methods. The fractional Volume Of Fluid （VOF） model of the air-water two phase flows was introduced to track the interface. Consequently, the quantitative expression of the interfacial mass transfer coefficients related with velocity and kinetic energy at the free surface was derived and the re-aeration model for the water flow over spillway was established. The examination with the experimental data of different conditions shows the validity of the re-aeration model for the water flow over spillways. This study will be important to evaluate the dissolved oxygen concentration and self-purification ability of rivers.

关键词： re-aeration mass transfer coefficient spillway

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