Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh-Benard convection with spatial inhomogeneity

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh-Benard convection with spatial inhomogeneity
	He, XZ ; Shang, XD ; Tong, PE
刊名	JOURNAL OF FLUID MECHANICS
	2014
卷号	753 页码:104-130
关键词	Rayleigh-Benard convection intermittency turbulent flows
ISSN号	0022-1120
通讯作者	penger@ust.hk
中文摘要	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.
学科主题	Mechanics ; Physics
收录类别	SCI
资助信息	RGC of Hong Kong SAR [HKUST-605013]; NSFC [XDA11010202, U1033002]
原文出处	CAMBRIDGE UNIV PRESS
WOS记录号	WOS:000341118600006
公开日期	2014-12-11
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10518]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	He, XZ,Shang, XD,Tong, PE. 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.(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.