Possible statistics of two coupled random fields: Application to passive scalar

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	Possible statistics of two coupled random fields: Application to passive scalar
	He GW(何国威)
	2001
出处	Dubrulle B; 何国威.Possible statistics of two coupled random fields: Application to passive scalar:2001.
中文摘要	We use the relativity postulate of scale invariance to derive the similarity transformations between two coupled scale-invariant random fields at different scales. We find the equations leading to the scaling exponents. This formulation is applied to the case of passive scalars advected i) by a random Gaussian velocity field; and ii) by a turbulent velocity field. In the Gaussian case, we show that the passive scalar increments follow a log-Levy distribution generalizing Kraichnan''s solution and, in an appropriate limit, a log-normal distribution. In the turbulent case, we show that when the velocity increments follow a log-Poisson statistics, the passive scalar increments follow a statistics close to log-Poisson. This result explains the experimental observations of Ruiz et al. about the temperature increments.
语种	英语
内容类型	研究报告
源URL	[http://dspace.imech.ac.cn/handle/311007/44607]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	He GW. Possible statistics of two coupled random fields: Application to passive scalar. 2001.