Aspect ratio effects in quasi-two-dimensional turbulence

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

13 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Article number125102
Pages (from-to)1-10
Journal / PublicationPhysics of Fluids
Volume17
Issue number12
Publication statusPublished - Dec 2005
Externally publishedYes

Abstract

The influence of the aspect ratio on the three-dimensionalization and subsequent saturation of freely decaying two-dimensional turbulence is studied numerically. We show that the aspect ratio strongly affects the saturation level of the perturbation and its feedback on the base flow. The saturation level scales linearly with the aspect ratio, as does the total damping exerted by the perturbation. In spectral space the feedback yields a positive eddy viscosity at large scales and a small eddy viscosity at small scales. A surprising result is the persistence of coherent vortices even after the saturation of the perturbation. © 2005 American Institute of Physics.

Citation Format(s)

Aspect ratio effects in quasi-two-dimensional turbulence. / Ngan, K.; Straub, D. N.; Bartello, P.

In: Physics of Fluids, Vol. 17, No. 12, 125102, 12.2005, p. 1-10.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal