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Method for efficient prevention of gravity wave decoupling on rectangular semi-staggered grids

机译:矩形半交错网格上有效防止重力波解耦的方法

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Generation of short gravity wave noise often occurs on semi-staggered rectangular grids as a result of sub-grid decoupling when there is a strong forcing in the mass field. In this study a numerical scheme has been proposed to prevent the generation of the gravity wave decoupling. The proposed numerical method provides efficient communication between decoupled gravity wave finite-difference solutions by a simple averaging of a term in the height tendency in the continuity equation. The proposed method is tested using a shallow water sink model developed for the purpose of this study. It has been demonstrated that this method outperforms other existing approaches. The new scheme is time efficient, based on explicit time integration and can be easily implemented. The proposed method is applicable in hydrodynamic models specified on semi-staggered B or E grids.
机译:短重力波噪声的产生通常在半交错矩形网格上发生,这是由于在质量场中存在强力而导致的子网格去耦的结果。在这项研究中,提出了一种数值方案来防止重力波解耦的产生。所提出的数值方法通过对连续性方程中高度趋势中的项进行简单平均,从而在解耦的重力波有限差分解之间提供了有效的通信。使用本研究目的开发的浅水槽模型对提出的方法进行了测试。已经证明该方法优于其他现有方法。新方案基于明确的时间积分,具有较高的时间效率,并且可以轻松实现。该方法适用于在B或E交错网格上指定的流体动力学模型。

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