首页   按字顺浏览 期刊浏览 卷期浏览 Analytical theories of turbulence and the &egr; expansion
Analytical theories of turbulence and the &egr; expansion

 

作者: William P. Dannevik,   Victor Yakhot,   Steven A. Orszag,  

 

期刊: Physics of Fluids(00319171)  (AIP Available online 1987)
卷期: Volume 30, issue 7  

页码: 2021-2029

 

ISSN:0031-9171

 

年代: 1987

 

DOI:10.1063/1.866216

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The fixed‐point form of hydrodynamic equations emerging from renormalization group analysis of strong turbulence is analyzed using perturbation expansion in powers of the renormalized coupling constant (Reynolds number) Re*∝&egr;1/2. In the second order of &egr; expansion, transport equations are derived for energy and variance of a passive scalar which are identical to the inertial‐range form of the eddy‐damped quasinormal Markovian approximation (EDQNM), but without adjustable parameters which must be determined from experiment. The energy and scalar variance spectra are predicted to beEk=1.617&egr;¯2/3k−5/3, and &THgr;k=1.146N¯ &egr;¯−1/3k−5/3, where &egr;¯ andN¯ are, respectively, the dissipation rate of energy and scalar variance. This level of agreement with experiment has in the past proved difficult to obtain from renormalized perturbation theory applied to thebarehydrodynamic equations, without introduction of parameters that must be adjusted to different values for different dynamical fields. The fidelity of the present method, which emphasizes in a particular way the distant interactions inkspace, may be related to the degree of nonlocality of the bare dynamics as manifested by possible generic Beltramization tendencies in strong turbulence.

 

点击下载:  PDF (1042KB)



返 回