Assessment of spurious mixing in adaptive mesh simulations of the two-dimensional lock-exchange
Assessment of spurious mixing in adaptive mesh simulations of the two-dimensional lock-exchange
复制标题
DOI：
10.1016/j.ocemod.2013.10.003
复制
发表时间：
2014
期刊：
影响因子：
3.2
通讯作者：
H. Hiester;M. Piggott;P. Farrell;P. Allison
中科院分区：
文献类型：
--
作者：
H. Hiester;M. Piggott;P. Farrell;P. Allison
数值模拟用于评估自适应网格对二维锁交换流的影响。特别是，通过计算背景势能来量化二重混合。指导网格自适应的度量选择是自适应网格模拟成功的基础。评估不同基于 Hessian 的指标的性能，并评估与固定网格模拟相比表现优于和表现不佳的情况。性能差异是由于度量的不同形式以及较小规模的波动可以影响适应的网格的程度造成的。性能最佳的度量所产生的二重混合水平可与使用多一到两个数量级网格顶点的高分辨率固定网格模拟相媲美。混合与 Özgökmen 等人的数值模拟的比较。 (2007) 还证明了自适应网格模拟的有效性。
Numerical simulations are used to evaluate the impact of adaptive meshes on the two-dimensional lock-exchange flow. In particular, the diapycnal mixing is quantified through calculation of the background potential energy. The choice of metric, which guides the mesh adapt, is fundamental to the success of an adaptive mesh simulation. The performance of different Hessian-based metrics is assessed and cases that both outperform and underperform, compared to fixed mesh simulations, are evaluated. The differences in performance result from the different forms of the metric and the extent to which smaller-scale fluctuations can influence the adapted mesh. The best performing metric produces levels of diapycnal mixing that are comparable to high resolution fixed mesh simulations that use one to two orders of magnitude more mesh vertices. Comparison of the mixing with the numerical simulations of Özgökmen et al. (2007) also demonstrates the validity of the adaptive mesh simulations.