Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh-Benard convection with spatial inhomogeneity
He, XZ; Shang, XD; Tong, PE; penger@ust.hk
2014
发表期刊JOURNAL OF FLUID MECHANICS
ISSN0022-1120
卷号753页码:104-130
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.
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
关键词Rayleigh-benard Convection Intermittency Turbulent Flows
学科领域Mechanics ; Physics
资助者RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002] ; RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002] ; RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002] ; RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002]
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收录类别sci
资助项目LTO
资助者RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002] ; RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002] ; RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002] ; RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002]
WOS记录号WOS:000341118600006
引用统计
被引频次:7[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10518
专题热带海洋环境国家重点实验室(LTO)
通讯作者penger@ust.hk
推荐引用方式
GB/T 7714
He, XZ,Shang, XD,Tong, PE,et al. Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh-Benard convection with spatial inhomogeneity[J]. JOURNAL OF FLUID MECHANICS,2014,753:104-130.
APA He, XZ,Shang, XD,Tong, PE,&penger@ust.hk.(2014).Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh-Benard convection with spatial inhomogeneity.JOURNAL OF FLUID MECHANICS,753,104-130.
MLA He, XZ,et al."Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh-Benard convection with spatial inhomogeneity".JOURNAL OF FLUID MECHANICS 753(2014):104-130.
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