Understanding the different scaling behavior in various shell models proposed for turbulent thermal convection
Publication in refereed journal

香港中文大學研究人員

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摘要Different scaling behavior has been reported in various shell models proposed for turbulent thermal convection. In this paper, we show that buoyancy is not always relevant to the statistical properties of these shell models even though there is an explicit coupling between velocity and temperature in the equations of motion. When buoyancy is relevant (irrelevant) to the statistical properties, the scaling behavior is Bolgiano-Obukhov (Kolmogorov) plus intermittency corrections. We show that the intermittency corrections of temperature could be solely attributed to fluctuations in the entropy transfer rate when buoyancy is relevant but due to fluctuations in both energy and entropy transfer rates when buoyancy is irrelevant. This difference can be used as a criterion to distinguish whether temperature is behaving as an active or a passive scalar. (c) 2008 Elsevier B.V. All rights reserved.
著者Ching ESC, Guo H, Cheng WC
期刊名稱Physica D: Nonlinear Phenomena
出版年份2008
月份8
日期15
卷號237
期次14-17
出版社Elsevier
頁次2009 - 2014
國際標準期刊號0167-2789
語言英式英語
關鍵詞scaling behavior; shell models; turbulent thermal convection
Web of Science 學科類別Mathematics; Mathematics, Applied; MATHEMATICS, APPLIED; Physics; Physics, Mathematical; PHYSICS, MATHEMATICAL; Physics, Multidisciplinary; PHYSICS, MULTIDISCIPLINARY

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