| 符传君,练继建.溃坝水流在复杂河道中传播的三维数值模拟[J].水利学报,2007,38(10):1151-1157 |
| 溃坝水流在复杂河道中传播的三维数值模拟 |
| Three dimensional numerical simulation of dam break flow in complicated river sections |
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| DOI： |
| 中文关键词: 溃坝 复杂河道 三维数值模拟 有限体积法 VOF法 |
| 英文关键词: complicatedlriver channel three dimensional numerical simulation finite volume method VOF method |
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| 摘要点击次数: 1854 |
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| 中文摘要: |
| 为研究河道弯曲和障碍物对溃坝波传播的影响，采用有限体积法对描述水流运动紊流模型和描述自由水面运动的VOF方程进行离散，建立了溃坝水流运动的三维数学模型，并对急弯河道进行了数值模拟计算。急弯河道溃坝波传播过程的模拟结果与前人实体模型试验结果基本一致。利用该模型研究了丁坝附近溃坝波传播的特性和溃坝水流的内部结构，数值模拟结果表明，溃坝波的传播受河道弯曲或障碍物的影响，产生反射和绕射，使得局部溃坝水流呈明显的三维特性。上游丁坝迎水面受到溃坝波波前的直接冲击，其动水压力远大于作用于下游丁坝的动水压力。另外，障碍物对溃坝水流的影响主要局限在障碍物上游和下游一定范围内，在此范围外，水流呈二维或一维特性。 |
| 英文摘要: |
| Based on finite volume method, a three dimensional numerical model for dam break flow was established by discretization of Reynolds Equations, turbulence model and VOF equation. The process of dam break wave propagation in a river with sharp bend was calculated by using this model. The result of simulation is in good agreement with the experimental data given by other authors. The dam break wave propagation and internal structure of dam break flow in the vicinity of spur dikes were also studied with this model. Simulation results reveal that the reflection and diffraction of dam break wave may occur near obstructions in river channel, where dam break flow exhibits three dimensional characteristics. The hydrodynamic pressure acting on the leading face of the upstream spur dike is much greater than that of downstream dike because of the direct impaction of dam break wave. However, the influence of obstructions on dam break flow is limited in a certain river section, beyond this region the flow exhibits two dimensional or one dimensional features. |
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