Molecular Motion in Isotropic Turbulence

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	Molecular Motion in Isotropic Turbulence
	Fan J(樊菁); Jiang JZ(蒋建政); Fei F(费飞)
	2011
会议名称	27th International Symposium on Rarefied Gas Dynamics
会议日期	JUL 10-15, 2010
会议地点	Pacific Grove, CA
关键词	isotropic turbulence tracer molecule TMIC DNS DSMC
卷号	1333
页码	1385-1390
通讯作者	Fan, J (reprint author), Chinese Acad Sci, Inst Mech, Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
中文摘要	Molecular motion in turbulence is a major fundamental and engineering problem, and the classical particle approaches are difficult to solve it because of a wide separation of temporal and spatial scales between thermal motion and turbulent fluctuation. A hybrid method named as tracer molecules in continuum (TMIC) has been proposed to address the issues. Using the TMIC method, molecular motion in isotropic turbulence was investigated, and the Reynolds number based on the Taylor micro-scale was about 68. The TMIC calculation shows that tracer molecules are dominated by the thermal motion when time is comparable to the mean collision time, and by the turbulent fluctuation when time is comparable to the integral time scale of turbulence. Between the two time scales, a mixed mode prevails for which both thermal motion and turbulent fluctuation are important. The corresponding turbulent diffusion and viscosity coefficients obtained by TMIC are about 1.2 x 10(-3) m(2) sec(-1) and 7.5 x 10(-3) Nm(-2) sec, respectively, two orders larger than those due to thermal motion
收录类别	CPCI
产权排序	Chinese Acad Sci, Inst Mech, Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
会议主办者	Asilomar Conf Grounds
会议网址	http://dx.doi.org/10.1063/1.3562836
会议录	27TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS, 2010, PTS ONE AND TWO
会议录出版者	AMER INST PHYSICS
会议录出版地	2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
学科主题	Physics ; Applied; Physics ; Multidisciplinary
语种	英语
ISSN号	0094-243X
ISBN号	978-0-7354-0889-0
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/45276]
专题	力学研究所_高温气体动力学国家重点实验室
推荐引用方式 GB/T 7714	Fan J,Jiang JZ,Fei F. Molecular Motion in Isotropic Turbulence[C]. 见:27th International Symposium on Rarefied Gas Dynamics. Pacific Grove, CA. JUL 10-15, 2010.http://dx.doi.org/10.1063/1.3562836.