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首页> 外文会议>IAHR World Congress >DEVELOPMENT AND VALIDATION OF A 3D NUMERICAL MODEL TO SIMULATE FLOODS IN NATURAL STREAMS
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DEVELOPMENT AND VALIDATION OF A 3D NUMERICAL MODEL TO SIMULATE FLOODS IN NATURAL STREAMS

机译：三维数值模型的发展与验证模拟自然流中洪水的洪水

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The paper discusses the development and validation of a 3D RANS model using the commercial code STAR-CCM+ to simulate flooding in natural streams. The Volume of Fluid (VOF) method is used to calculate the deformations of the free surface. The k-ω turbulence model is used to account for turbulence effects. Simulations conducted for this type of applications conducted on meshes containing 1-10 million grid cells show that the code scales well. Validation results are presented for a standard test case corresponding to steady flow in an S-shaped open channel of trapezoidal cross section. The predictions of the free surface deformations and streamwise velocity profiles in selected cross sections are found to agree well with experimental data. Then, the model is applied to predict flow and free surface elevations in a 1-km long reach of the Iowa River near Iowa City. The simulation successfully captures the centerline variation of the free surface elevation, while mass conservation errors are small across the domain. Ongoing applications of the present model include performing unsteady flow simulations corresponding to the propagation of a flood wave in a natural channel and assessing the performance and limitations of popular 2D models used to predict flood propagation in natural environments.
机译：本文讨论了使用商业代码Star-CCM +模拟自然流中洪水的3D RAN模型的开发和验证。流体（VOF）方法的体积用于计算自由表面的变形。 K-Ω湍流模型用于算出湍流效应。在含有1-10万个网格单元格的网格上进行这种类型的应用进行了模拟，表明代码符合良好。验证结果用于对应于梯形横截面的S形开放通道中的稳定流动的标准测试案例。发现选择横截面中自由表面变形和流动速度分布的预测与实验数据很好。然后，该模型用于预测Iowa City附近的1公里长的Iowa河流的流动和自由表面升高。模拟成功捕获了自由表面高度的中心线变化，而域中的质量保护误差很小。本模型的持续应用包括执行与自然信道中的泛波传播的不稳定流模拟，并评估用于预测自然环境中的洪水传播的流行2D模型的性能和限制。

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