论文标题
经典液压跳跃的LE：建模参数对预测精度的影响
LES of a classical hydraulic jump: Influence of modelling parameters on the predictive accuracy
论文作者
论文摘要
报道了从Inlet Froude 2号的经典液压跳跃大型模拟的结果。使用基于通用的有限体积的代码OpenFOAM进行计算，主要目标是评估建模参数对预测精度的影响，并建立相关的最佳实践指南。进行了密集的计算网格上的基准模拟，并发现与现有参考文献的良好一致。其余模拟涵盖了建模参数的不同选择：几何与代数界面捕获，三个网格分辨率水平，对流通量插值方案的四个选择。几何界面捕获可提高准确性，但数值稳定性恶化并增加了模拟时间。有趣的是，在准确性和稳定性方面，数值耗散显示可系统地改善结果。发现这三个网格的密度是基准模拟中使用的网格的两倍，这足以忠于忠实地再现所有感兴趣的数量。因此，建议使用此网格，几何界面捕获以及对流通量的二阶向上方案。
Results from large-eddy simulations of a classical hydraulic jump at inlet Froude number 2 are reported. The computations are performed using the general-purpose finite-volume based code OpenFOAM, and the primary goal is to evaluate the influence of modelling parameters on the predictive accuracy, as well as establish associated best-practice guidelines. A benchmark simulation on a dense computational mesh is conducted, and good agreement with existing reference data is found. The remaining simulations cover different selections of modelling parameters: geometric vs algebraic interface capturing, three mesh resolution levels, four choices of the convective flux interpolation scheme. Geometric interface capturing leads to better accuracy but deteriorated numerical stability and increased simulation times. Interestingly, numerical dissipation is shown to systematically improve the results, both in terms of accuracy and stability. The densest of the three grids, which is twice as coarse as the grid used in the benchmark simulation, was found to be sufficient for faithfully reproducing all the considered quantities of interest. The recommendation is therefore to use this grid, geometric interface capturing, and a second-order upwind scheme for the convective fluxes.
