The return of strongly anisotropic turbulence to isotropy
作者:
Norihiko Nakauchi,
Hiroshi Oshima,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1987)
卷期:
Volume 30,
issue 12
页码: 3653-3660
ISSN:0031-9171
年代: 1987
DOI:10.1063/1.866452
出版商: AIP
数据来源: AIP
摘要:
Energy spectrum equations for homogeneous axisymmetric turbulence are formulated using the eddy‐damped quasinormal Markovian (EDQNM) approximation. The equations, which consist of two spectrum functions of the two variablesk(the magnitude of the wavevectork) and &mgr; (the cosine of the angle betweenkand the direction of axisymmetry), are computed directly, without any reduction, under initial conditions for different degrees of anisotropy. In this paper, the results for cases of medium anisotropic and nearly two‐dimensional initial conditions are reported. A remarkable result was that in the nearly two‐dimensional case, some characteristic properties of two‐dimensional isotropic turbulence, such as inverse energy cascades, are observed. Also, particular attention is paid to the effects of pressure‐strain correlation and inertial energy transfer on the return of anisotropic turbulence to isotropy.
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