垂直网格计算频散性的研究
COMPUTATIONAL DISPERSION PROPERTIES OF VERTICALLY STAGGERED GRIDS
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摘要: 在线性斜压原始方程组的基础上, 从频率和群速方面讨论了几种垂直跳点网格和时间—垂直跳点网格的计算频散性, 并指出了出现错误群速的垂直尺度范围。以便为原始方程大气模式选取垂直网格提供指导。Abstract: Based on a linear baroclinic primitive equation system, the computational dispersion properties of vertical and time-vertical staggered grids are analyzed in terms of frequency and group velocity characteristics, and the vertical scale ranges of group velocities with wrong sign are pointed out. It may provide guidance for an optimal choice of an appropriate vertical grid for a primitive equation atmospheric model.
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Key words:
- Vertically grid;
- Frequency;
- Group velocity;
- Scale range
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表 1 各种垂直网格出现正群速和负群速的垂直尺度范围
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