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On utility of triangular C-grid type discretization for numerical modeling of large-scale ocean flows

机译:三角C网格离散化在大规模海流数值模拟中的应用

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摘要

Ocean circulation models based on triangular C-grid discretization are frequently employed to simulate coastal ocean dynamics on unstructured meshes. It is shown that on time and space scales dominated by slow geostrophic dynamics, this discretization tends to exhibit checkerboard noise in the field of horizontal velocity divergence and vertical velocity, respectively. The noise is linked to the geometry of triangular C-grid and is amplified in regimes that are close to geostrophic balance through the particular structure of the Coriolis operator. It can be partly suppressed in some cases but remains a problem in a general case and makes the triangular C-grid a suboptimal choice for large-scale ocean modeling.
机译:基于三角C网格离散化的海洋环流模型经常用于模拟非结构化网格上的沿海海洋动力学。结果表明,在时间和空间尺度上,地转动力学缓慢,这种离散趋向于在水平速度发散和垂直速度领域分别显示棋盘噪声。噪声与三角形C形网格的几何形状相关,并通过科里奥利算子的特定结构在接近地转平衡的状态下被放大。在某些情况下,可以部分抑制它,但在一般情况下,它仍然是一个问题,使三角形C网格成为进行大规模海洋建模的次佳选择。

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