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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Large-eddy simulation study of turbulent flow over a complex topography using the terrain-following coordinate transformation method: application to aeolian dunes.
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Large-eddy simulation study of turbulent flow over a complex topography using the terrain-following coordinate transformation method: application to aeolian dunes.

机译：APS-APS流体动力学分部第70届年会-事件-使用地形跟随坐标变换方法对复杂地形上的湍流进行大涡模拟研究：应用于风沙丘。

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Modeling of turbulent flow over complex topography is of great interest in many engineering applications. However, accurate modeling of turbulent flow over complex topography still presents major technical challenges. The immersed boundary method (IBM) has been widely used to deal with the arbitrary domain geometry, due to its advantage of keeping the computation grid and, thus, preservation of the original numerical formulation. But IBM can introduce wall-modeling errors since the terrain and computational mesh points are not collocated. Terrain-following coordinate transformation, however, obviates wall-modeling errors. In this study, an existing large-eddy simulation (LES) code has been generalized for coordination transformation in the wall-normal direction, and applied to flow over a series of topographic configurations (flat surface, as a baseline for comparison, spanwise ridge, and an aeolian dune digital elevation map). Validation of simulation data has, firstly, been performed via comparison with first- and second-order data experimental data. Secondly, for the three-dimensional hill and dune cases, an LES simulation with IBM will be also performed. The implications of these results for physics-based, aeolian morphodynamic modeling will be discussed.
机译：在许多工程应用中，对复杂地形上的湍流建模非常感兴趣。但是，在复杂地形上对湍流进行精确建模仍存在重大技术挑战。由于其具有保持计算网格并因此保留原始数值公式的优势，因此浸入边界方法（IBM）已被广泛用于处理任意域几何。但是，由于地形和计算网格点未并置，IBM可能会引入墙建模错误。但是，跟随地形的坐标转换消除了墙建模误差。在这项研究中，已将现有的大涡模拟（LES）代码进行了通用化，以在壁法线方向上进行坐标转换，并将其应用于流经一系列地形配置（平坦表面（作为比较的基准），展向脊，以及风沙丘数字高程图）。首先，通过与一阶和二阶数据实验数据进行比较来进行模拟数据的验证。其次，对于三维丘陵和沙丘案例，还将与IBM进行LES模拟。将讨论这些结果对基于物理学的风沙形态动力学建模的意义。

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