Flow Reversals in Thermally Driven Turbulence
Publication in refereed journal

香港中文大學研究人員

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摘要We analyze the reversals of the large-scale flow in Rayleigh-Benard convection both through particle image velocimetry flow visualization and direct numerical simulations of the underlying Boussinesq equations in a (quasi-) two-dimensional, rectangular geometry of aspect ratio 1. For medium Prandtl number there is a diagonal large-scale convection roll and two smaller secondary rolls in the two remaining corners diagonally opposing each other. These corner-flow rolls play a crucial role for the large-scale wind reversal: They grow in kinetic energy and thus also in size thanks to plume detachments from the boundary layers up to the time that they take over the main, large-scale diagonal flow, thus leading to reversal. The Rayleigh vs Prandtl number space is mapped out. The occurrence of reversals sensitively depends on these parameters.
著者Sugiyama K, Ni R, Stevens RJAM, Chan TS, Zhou SQ, Xi HD, Sun C, Grossmann S, Xia KQ, Lohse D
期刊名稱Physical Review Letters
出版年份2010
月份7
日期16
卷號105
期次3
出版社American Physical Society
國際標準期刊號0031-9007
電子國際標準期刊號1079-7114
語言英式英語
Web of Science 學科類別Physics; Physics, Multidisciplinary; PHYSICS, MULTIDISCIPLINARY

上次更新時間 2021-15-04 於 23:43