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首页> 外文期刊>European Journal of Mechanics, B. Fluids >Run-up flow of a collapsing bore over a beach
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Run-up flow of a collapsing bore over a beach

机译：塌陷海滩上空的上升流

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摘要

The collapse of a 2D bore propagating shoreward on a sloping beach and the subsequent run-up from the shoreline and run-down are simulated using a Reynolds Averaged Navier-Stokes (RANS) model based on a Volume of Fluid (VOF) method. The results are compared with experimental results. The bore collapse phenomenon is first studied and the transition between bore collapse and run-up is characterized. Numerical results indicate that the bore collapse phenomenon is not completed at the shoreline. The transition is further upslope and the energy at the transition includes a significant part of potential energy unlike that predicted by the classical theory of Whit ham. The swash flow is investigated, showing the dissymmetry between run-up and run-down. Taking into account the modeling of turbulence slightly reduces the run-up height and allows recovering the value experimentally recorded. The bottom shear stress variations were computed from the results of numerical simulations. The maximum bottom shear stress is at any time found in the vicinity of the bore head. It is maximum at the transition between bore collapse and run-up flow and decreases while the run-up flow climbs on the beach.
机译：使用基于流体体积（VOF）方法的雷诺平均Navier-Stokes（RANS）模型，模拟了在倾斜海滩上向海岸传播的2D孔的坍塌以及随后从海岸线的上升和下降。将结果与实验结果进行比较。首先研究了钻孔塌陷现象，并表征了钻孔塌陷与上升之间的过渡。数值结果表明，孔塌陷现象没有在海岸线完成。该转变是进一步的上升，并且转变中的能量包括势能的很大一部分，这与经典的惠特·汉姆理论所预测的不同。研究了斜流，显示了上升和下降之间的不对称性。考虑到湍流的建模，会稍微减小加速高度，并允许恢复实验记录的值。从数值模拟的结果计算出底部剪切应力的变化。在井头附近的任何时候都可以找到最大的底部剪切应力。它在钻孔塌陷和上升流之间的过渡处最大，而在上升流在海滩上爬升时减小。

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