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            學術報告

            學術活動

            學術報告
            08/11 2022 Seminar
            • Title題目 Inverse Energy Cascade and Intermittency in 2D bacterial turbulence
            • Speaker報告人 黃永祥 (廈門大學)
            • Date日期 2022年8月11日 10:30
            • Venue地點 https://meeting.tencent.com/dm/0Ke9YfkgZ9TQ TencentMeeting:943-348-695
            • Abstract摘要

              The mesoscale turbulence was found experimentally for the active interaction between the bacteria and flow fluid (e.g., water). More precisely, the large-scale coherent flow pattern, e.g., 10 times larger than the bacterial body size was experimentally found at nearly zero Reynolds number. This fascinating phenomenon can be understood in the framework of turbulence, where the kinetic energy is injected into the system via a size of bacterial body length R in a few μms, and is transferred to up scales. In this talk, the scaling behavior of the bacterial turbulence is analyzed experimentally. Our results confirm the existence of the inverse energy cascade, e.g., transferring kinetic energy from small-scale structures to larger ones. Moreover, the intensity of the intermittency correction, i.e., the departure from the pure scaling relation for the high-order moments, is characterized quantitatively in the log-normal framework. Finally, the possible universality of the intermittency correction is discussed as a perspective.


               

              黃永祥 廈門大學 海洋與地球學院 近海海洋環境科學國家重點實驗室 副教授,2002年畢業于上海交通大學,獲學士學位,2009年獲上海大學、法國里爾大學博士學位。主要從事湍流統計理論及其應用,非線性-非平穩統計方法及其應用研究,曾獲2013年歐洲地球科學聯盟地球科學中非線性過程部杰出青年科學家獎,在Journal Geophysical Research、Journal of Fluid Mechanics、Physics of Fluids、Physical Review E、Atmospheric Chemistry and Physics、Atmospheric Environment、Journal of Marine Systems等主流期刊發表SCI論文60余篇,并由劍橋大學出版社出版英文專著一部。

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