一様等方性乱流DNSを用いたLagrange的加速度の解析(乱流基礎(4),一般講演)
書誌事項
- タイトル別名
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- Analysis of Lagrangian acceleration by DNS of isotropic turbulence
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To study the properties of extreme events in Lagrangean acceleration we analyze Lagrangian data obtained from a direct numerical simulation of forced homogeneous isotropic turbulence which was performed on 1024^3 grid points with R 283. The extreme events are known to be trapping events by vortex filaments. Our analysis shows that the extreme Lagrangian accelerations are accompanied by spiral motions whose frequency is about 0.5Τ_η^1 and whose duration is less than about 10Τ_η, where Τ_η is the Kolmogorov time scale. It is found that the extreme events are strongly correlated with time variation of Lagrangian vorticities.
収録刊行物
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- 日本流体力学会年会講演論文集
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日本流体力学会年会講演論文集 2008 169-, 2008-09-04
日本流体力学会
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詳細情報 詳細情報について
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- CRID
- 1544231895052905088
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- NII論文ID
- 110008459465
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- NII書誌ID
- AA11567941
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- 本文言語コード
- ja
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- データソース種別
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- NDL-Digital
- CiNii Articles