A343 有限体積法を用いたReduced Grid大気大循環モデルによる浅水波方程式(A-34 大気の流れ(4),一般講演)

概要

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We have been developed a non-hydrostatic atmospheric global circulation simulation code by using introduced reduced grid. Original Reduced grid (Kurihara (1965)) was well known as a kind of grid system, which longitudal grids points decreases gradually toward the pole. In order to reduce computational errors in derivatives of the approximate solution, grid aspect ratio is required to be 1.0 for any objective region. In the Kurihara reduced grid system, there are only 4 grid points in the polar region, therefore, grid aspect ratio is (2π)/4≃1.5 there. In this study, we developed a new grid system which is divided into 6 regions, where grid aspect ratio near the pole region becomes (2π)/6≃1.045. In this presentation, we will present a results of williamson (1992)'s shallow-water benchmark tests. Furthermore, we will discuss features on introduced reduced grid system.
日本流体力学会の論文
2004-08-09