Coupling the Hexagonal B1-grid and B2-grid to Avoid a Computational Mode Problem of the Hexagonal ZM-grid
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- Miura Hiroaki
- Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
書誌事項
- 公開日
- 2017
- 資源種別
- journal article
- DOI
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- 10.2151/sola.2017-013
- 公開者
- 公益社団法人 日本気象学会
説明
<p>A shallow water model is developed on the regular hexagonal mesh by combining the hexagonal B1-grid and B2-grid schemes. The new scheme called as the hexagonal synchronized B-grid (SB-grid) scheme in this work allows avoiding a computational mode problem of the ZM-grid scheme. It is known that the problem is caused by the mismatch of degrees of freedoms of the prognostic variables. The SB-grid uses the same variable arrangement as the ZM-grid, placing fluid depths and fluid velocities at the centers and corners of hexagonal cells, respectively, but the nonlinear terms of the momentum equation are discretized using wider spatial stencils than those of the ZM-grid. This change results in the inhibition of extra interactions in the velocity fields that enhances a computational mode in the ZM-grid. Geostrophic adjustment tests on a regular hexagonal mesh confirm that the SB-grid shallow water model behaves almost equivalently to the Z-grid model, and the computational mode problem is certainly settled down.</p>
収録刊行物
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- SOLA
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SOLA 13 (0), 69-73, 2017
公益社団法人 日本気象学会
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詳細情報 詳細情報について
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- CRID
- 1390001205221208960
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- NII論文ID
- 130005628479
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- ISSN
- 13496476
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
