| Numerical Simulation of Open-Channel Flow in 90-Degree Combining Junction |
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| 引用本文： | 武蓉,茅泽育. Numerical Simulation of Open-Channel Flow in 90-Degree Combining Junction[J]. 清华大学学报, 2003, 8(6): 713-718 |
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| 作者姓名： | 武蓉 茅泽育 |
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| 作者单位： | DepartmentofHydraulicandHydropowerEngineering,TsinghuaUniversity,Beijing100084,China |
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| 基金项目： | the National Natural Science Foundationof China(No. 5 0 0 790 0 8) |
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| 摘 要： | Combining flows often occur in open channel networks of drainage systems and river engineering. Open-channel junction flows were analyzed by solving the depth-averaged two-dimensional, elliptic Reynolds-averaged Navier-Stokes equations with the Hanjalic-Launder (H-L) modification to the κ-ε turbulence model without the free surface “rigid lid” approximation with an efficient finite-volume procedure. The model can also analyze flows with separation. The model was used to analyze the relative importance of various factors and was compared with laboratory measurements. The H-L modification produced much better simulations of the separation zone size with 20% better accuracy than the standard κ-ε model. The H-L modification was then used to study the characteristic of junction flows and the separation zones with different discharge ratios. The simulational results show that separation zone size decreases as the discharge ratio of the upstream main channel to the downstream channel increases.
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| 关 键 词： | 数字仿真 排水系统 河道节点 κ-ε紊流模型 |
Numerical Simulation of Open-Channel Flow in 90-Degree Combining Junction |
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| WU Rong,MAO Zeyu. Numerical Simulation of Open-Channel Flow in 90-Degree Combining Junction[J]. Tsinghua Science and Technology, 2003, 8(6): 713-718 |
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| Authors: | WU Rong MAO Zeyu |
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| Affiliation: | Department of Hydraulic and Hydropower Engineering, Tsinghua University,Beijing 100084, China;Department of Hydraulic and Hydropower Engineering, Tsinghua University,Beijing 100084, China |
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| Abstract: | Combining flows often occur in open channel networks of drainage systems and river engineering. Open-channel junction flows were analyzed by solving the depth-averaged two-dimensional, elliptic Reynolds-averaged Navier-Stokes equations with the Hanjalic-Launder (H-L) modification to the k-ε turbulence model without the free surface "rigid lid" approximation with an efficient finite-volume procedure. The model can also analyze flows with separation. The model was used to analyze the relative importance of various factors and was compared with laboratory measurements. The H-L modification produced much better simulations of the separation zone size with 20% better accuracy than the standard k-ε model. The H-L modification was then used to study the characteristic of junction flows and the separation zones with different discharge ratios. The simulational results show that separation zone size decreases as the discharge ratio of the upstream main channel to the downstream channel increases. |
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| Keywords: | open-channel junction junction flow Hanjalic-Launder (H-L) model |
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