| APPLICATION OF A MODIFIED QUICK SCHEME TO DEPTH- AVERAGED κ-ε TURBULENCE MODEL BASED ON UNSTRUCTURED GRIDS |
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| 作者姓名： | HUA Zu-lin XING Ling-hang GU Li |
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| 作者单位： | Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China, |
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| 基金项目： | Project supported by the National Nature Science Foundation of China （Grant Nos. 50679019 and 50009001）, the National Basic Research Program of China （973 Program, Grant No. 2008CB418202） and the Social Technology Development Foundation of Jiangsu Province （Grant No.BS2006095）. |
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| 摘 要： | The modified QUICK scheme on unstructured grid was used to improve the advection flux approximation, and the depth-averaged κ-ε turbulence model with the scheme based on FVM by SIMPLE series algorithm was established and applied to spur-dike flow computation. In this model, the over-relaxed approach was adopted to estimate the diffusion flux in view of its advantages in reducing errors and sustaining numerical stability usually encountered in non-orthogonal meshes. Two spur-dike cases with different defection angles （90°and 135°） were analyzed to validate the model. Computed results show that the predicted velocities and recirculation lengths are in good agreement with the observed data. Moreover, the computations on structured and unstructured grids were compared in terms of the approximately equivalent grid numbers. It can be concluded that the precision with unstructured grids is higher than that with structured grids in spite that the CPU time required is slightly more with unstructured grids Thus, it is significant to apply the method to numerical simulation of practical hydraulic engineering.
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| 关 键 词： | 栅格 湍流 模型设计 深度 |
| 收稿时间： | 9 July 2007 |
APPLICATION OF A MODIFIED QUICK SCHEME TO DEPTH- AVERAGED κ-ε TURBULENCE MODEL BASED ON UNSTRUCTURED GRIDS |
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| HUA Zu-lin XING Ling-hang GU Li.APPLICATION OF A MODIFIED QUICK SCHEME TO DEPTH- AVERAGED κ-ε TURBULENCE MODEL BASED ON UNSTRUCTURED GRIDS[J].Journal of Hydrodynamics,2008,20(4):514-523. |
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| Authors: | HUA Zu-lin XING Ling-hang GU Li |
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| Affiliation: | Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China, |
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| Abstract: | The modified QUICK scheme on unstructured grid was used to improve the advection flux approximation, and the depth-averaged κ–? turbulence model with the scheme based on FVM by SIMPLE series algorithm was established and applied to spur-dike flow computation. In this model, the over-relaxed approach was adopted to estimate the diffusion flux in view of its advantages in reducing errors and sustaining numerical stability usually encountered in non-orthogonal meshes. Two spur-dike cases with different defection angles (90° and 135°) were analyzed to validate the model. Computed results show that the predicted velocities and recirculation lengths are in good agreement with the observed data. Moreover, the computations on structured and unstructured grids were compared in terms of the approximately equivalent grid numbers. It can be concluded that the precision with unstructured grids is higher than that with structured grids in spite that the CPU time required is slightly more with unstructured grids. Thus, it is significant to apply the method to numerical simulation of practical hydraulic engineering. |
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| Keywords: | unstructured grid modified QUICK FVM κ-ε turbulence model spur-dike |
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