Nonlinear vortex structures in obliquely rotating stratified fluids driven by small scale non helical forces

2017/06/01 by M. I. Kopp, Kopp, M. I., A. V. Tur +3
Earth and Planetary Sciences · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Geological formations and processes #Ocean Waves and Remote Sensing #Oceanographic and Atmospheric Processes

paper · pdf · doi:10.48550/arxiv.1706.00223

openalex publication_date 2017/06/01 · openalex created_date 2017/06/09 · openalex updated_date 2026/07/28

Abstract

In this paper, we study a new type of large-scale instability in obliquely rotating stratified fluids with small scale non-helical turbulence. The small-scale turbulence is generated by the external force with zero helicity and low Reynolds number. The theory uses the method of multiscale asymptotic developments. The nonlinear equations for large scale motions are obtained in the third order of the perturbation theory. In this paper, we consider the linear instability and the stationary nonlinear modes. We obtain solutions in the form of nonlinear Beltrami waves and localized vortex structures as kinks of new type.

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