TITLE:
Non Linear Vortex Structures in Stratified Fluid Driven by Small-Scale Helical Force
AUTHORS:
Anatoly Tur, Vladimir Yanovsky
KEYWORDS:
Vortex Structures; Large Scale Instability; Small Scale Helical Force; AKA-Effect
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.3 No.2,
June
5,
2013
ABSTRACT: In this work, we consider the effect of a small-scale helical driving force on fluid with a stable temperature gradient with Reynolds number . At first glance, this system does not have any instability. However, we show that a large scale vortex instability appears in the fluid despite its stable stratification. In a non-linear mode this instability becomes saturated and gives a large number of stationary spiral vortex structures. Among these structures there is a stationary helical soliton and a kink of the new type. The theory is built on the rigorous asymptotical method of multi-scale development.