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Dynamical aspect of entropy transfer in free convection turbulence

PhysRevE.61.2626.pdf243.32 kBPDF見る/開く

タイトル: Dynamical aspect of entropy transfer in free convection turbulence
著者: Toh, Sadayoshi 著作を一覧する
Iima, Makoto 著作を一覧する
発行日: 2000年 3月
出版者: The American Physical Society
誌名: Physical Review E
巻: 61
号: 3
開始ページ: 2626
終了ページ: 2639
出版社 DOI: 10.1103/PhysRevE.61.2626
抄録: From a dynamical perspective, entropy transfer processes are investigated in two-dimensional free convection turbulence in comparison with an entropy cascade picture based on the coupled dynamics of the T vorticity χ≡(∂yT,-∂xT) and the velocity gradient tensor. Typical entropy transfer processes are observed in direct numerical simulations. For these processes, two characteristic times, the transfer time and the staying time are determined: the former time obeys a Bolgiano-Obukhov (BO) time scaling corresponding to the eddy turnover time in energy cascade. It is suggested that this typical transfer process is not an elementary process of cascade but a dynamical manifestation of intermittency. To examine the meaning of the characteristic times of the typical entropy transfer process, a shell model is constructed based on the entropy cascade picture. By this model, it is shown numerically that typical entropy transfer processes are regarded as the fluctuations satisfying a dynamical similarity. This similarity proved by perturbation analysis requires naturally that the transfer time should obey the BO time scaling.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 飯間 信


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