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学科主题: Mechanics ; Physics
题名: Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh-Benard convection with spatial inhomogeneity
作者: He, XZ ; Shang, XD ; Tong, PE
通讯作者: penger@ust.hk
关键词: Rayleigh-Benard convection ; intermittency ; turbulent flows
刊名: JOURNAL OF FLUID MECHANICS
发表日期: 2014
卷: 753, 页:104-130
收录类别: sci
部门归属: [He, Xiaozhou ; Tong, Penger] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China ; [Shang, Xiao-dong] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
项目归属: LTO
资助者: RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002]
摘要: The scaling properties of the temperature structure function (SF) and temperature-velocity cross-structure function (CSF) are investigated in turbulent Rayleigh-Benard convection (RBC). The measured SFs and CSFs exhibit good scaling in space and time and the resulting SF and CSF exponents are obtained both at the centre of the convection cell and near the sidewall. A universal relationship between the CSF exponent and the thermal dissipation exponent is found, confirming that the anomalous scaling of passive temperature fluctuations in turbulent RBC is indeed caused by the spatial intermittency of the thermal dissipation field. It is also found that the difference in the functional form of the measured SF and CSF exponents at the two different locations in the cell is caused by the change of the geometry of the most dissipative structures in the (inhomogeneous) temperature field from being sheetlike at the cell centre to filament-like near the sidewall. The experiment thus provides direct evidence showing that the universality features of turbulent cascade are linked to the degree of anisotropy and inhomogeneity of turbulent statistics.
原文出处: 查看原文
WOS记录号: WOS:000341118600006
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10518
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Recommended Citation:
He, XZ; Shang, XD; Tong, PE.Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh-Benard convection with spatial inhomogeneity,JOURNAL OF FLUID MECHANICS,2014,753():104-130
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