原文传递
Performance of Three-Dimensional Modeling for Flow Structures in Channel Bends
| 题名： | Performance of Three-Dimensional Modeling for Flow Structures in Channel Bends |
| 其他题名： | Balen,V.W.,Uijttewaal,W.S.J.,and Blanckaert,K.(2010)."Large-eddy simulation of a curved open-channel flow over topography."Phys.Fluids,22(7),075108. |
| 正文语种： | 英文 |
| 作者： | Y. Xiao |
| 关键词： | Secondary flow;Channel bends;Flow structure;Three-dimensional numerical model;Turbulence model |
| 摘要： | Natural channels are seldom straight and commonly take sinuous patterns with turbulent and strongly three-dimensional (3D) flows in the bends. A 3D hydrodynamic model [Reynolds-averaged Navier-Stokes (RANS)] with major 3D flow features and different turbulence submodels was developed in a curvilinear, nonorthogonal coordinate system. A typical consecutive bend experiment was chosen as the verification case. A bend flow characteristic model with two turbulence submodels (k-« and shear-stress transport model) was developed using different grid mesh systems. A comparative assessment of the models was performed. The model verification was conducted by comparing the simulated velocity distribution, flow structure, and secondary current development with the experimental measurements. Differences between the simulations and measurements were observed when the secondary current or separation layer occurred. This indicates that the simulation accuracy in the high-sinuosity bends decreases with the development of channel bends. Comparison of the results obtained by the 3D RANS model with experimental and field data, and numerical predictions, validates that the k-« model with the fine-grid system is capable of simulating flow fields in curved open channels with reasonable accuracy. |
| 出版年： | 2017 |
| 论文唯一标识： | P-108Y2017V143N06004 |
| 英文栏目名称： | TECHNICAL NOTES |
| doi： | 10.1061/(ASCE)WW.1943-5460.0000418 |
| 期刊名称： | Journal of Waterway, Port, Coastal, and Ocean Engineering |
| 拼音刊名(出版物代码)： | P-108 |
| 卷： | 143 |
| 期： | 06 |
| 页码： | 20-30 |
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