Non Linear Vortex Structures in Stratified Fluid Driven by Small-Scale Helical Force

• 作者: Anatoly Tur Vladimir Yanovsky
• 来源期刊: 流体动力学(英文)
• 学科: 物理学
• 关键词: VORTEX Structures Large SCALE Instability Small SCALE HELICAL FORCE AKA-Effect
• 年，卷（期）: 2013,（2）
• 页码范围: 64-74
• 页数: 11页
• 分类号: O35

摘要

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.