Rotating helical turbulence. Part I. Global evolution and spectral behavior

Details Rotating helical turbulence. Part I. Global evolution and spectral behavior Rotating helical turbulence. Part I. Global evolution and spectral behavior

2009-09-07

arxiv.org/abs/0909.1272v1

Physics

Fluid Dynamics

9 pages, 14 figures

Scientific paper

We present results from two 1536^3 direct numerical simulations of rotating turbulence where both energy and helicity are injected into the flow by an external forcing. The dual cascade of energy and helicity towards smaller scales observed in isotropic and homogeneous turbulence is broken in the presence of rotation, with the development of an inverse cascade of energy now coexisting with direct cascades of energy and helicity. In the direct cascade range, the flux of helicity dominates over that of energy at low Rossby number. These cascades have several consequences for the statistics of the flow. The evolution of global quantities and of the energy and helicity spectra is studied, and comparisons with simulations at different Reynolds and Rossby numbers at lower resolution are done to identify scaling laws.

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