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3D numerical simulation of free surface flows over hydraulic structures in natural channels and rivers

机译：天然河道和河流中水力结构上自由表面流的3D数值模拟

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摘要

In this paper, a three-dimensional numerical model is developed, in which an Euler implicit method for the temporal discretization and the Finite Volume Method for the spatial discretization are applied to solve the Reynolds-averaged Navier-Stokes (RANS) equations for free surface flows over hydraulic structures in natural channels and rivers. At the free surface two different methods, the front-tracking and the front-capturing, are applied to calculate free surface profiles. The model has been validated against typical benchmarking experiments, and applied to a number of practical applications for natural rivers in Germany. Due to the limitation of the observation data in some application cases, in order to verify our numerical model, we besides have modified and applied the well-known open source CFD toolbox OpenFOAM to the same applications, then compared the results obtained from the OpenFOAM with our model results.
机译：本文建立了一个三维数值模型，在该模型中，采用了时间离散化的Euler隐式方法和空间离散化的有限体积方法来求解自由表面的雷诺平均Navier-Stokes（RANS）方程。流过自然通道和河流中的水工建筑物。在自由表面上，使用两种不同的方法，即前跟踪和前捕获，来计算自由表面轮廓。该模型已针对典型的基准实验进行了验证，并已应用于德国天然河流的许多实际应用。由于观测数据在某些应用案例中的局限性，为了验证我们的数值模型，我们还对著名的开源CFD工具箱OpenFOAM进行了修改和应用，然后将OpenFOAM的结果与我们的模型结果。

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