Nonlocal interactions and condensation in forced rotating turbulence

Conference paper

DOI: 10.1007/978-3-642-03085-7_100

Part of the Springer Proceedings in Physics book series (SPPHY, volume 132)
Cite this paper as:
Bourouiba L., Straub D. (2009) Nonlocal interactions and condensation in forced rotating turbulence. In: Eckhardt B. (eds) Advances in Turbulence XII. Springer Proceedings in Physics, vol 132. Springer, Berlin, Heidelberg

Abstract

The Rossby number, \(Ro = U/L2\Omega \), is the non-dimensional number characterizing rotating flows. Here U is the characteristic velocity, L the characteristic length scale, and \(2\Omega \) is the Coriolis parameter. When Ro → 0 the nonlinearity of the equations of motion becomes weak, and the theories of weak wave interactions apply. The normal modes of the flow can be decomposed into zero-frequency 2D large scale structures and inertial waves (3D).

Rotating turbulent flow experiments and simulations are known to generate large-scale two-dimensional (2D) columnar structures from initially isotropic turbulence. Decaying turbulence simulations show this generation to be dependent on Rossby number, with three distinct regimes appearing [1]. These are the weakly rotating Ro regime, for which the turbulent flow is essentially unaffected by rotation, the intermediate Ro range, characterized by a strong transfer of energy from the wave to the 2D modes (with a peak at around Ro 0.2), and the small Ro range for which the 2D modes receive less and less energy from the wave modes as Ro → 0.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Department of Mathematics and StatisticsYork UniversityYorkCanada
  2. 2.Department of Atmospheric and Oceanic SciencesMcGill UniversityMcGillCanada

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