Non Linear Vortex Structures in Stratified Fluid Driven by Small-Scale Helical Force
Non Linear Vortex Structures in Stratified Fluid Driven by Small-Scale Helical Force作者机构：Institute for Single Cristals Nat. Academy of Science Ukraine Kharkov Ukraine Université de Toulouse [UPS] CNRS Institut de Recherche en Astrophysique et PlanétologieToulouse Cedex France
出 版 物：《Open Journal of Fluid Dynamics》 (流体动力学（英文）)
年 卷 期：2013年第3卷第2期
页 面：64-74页
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
主 题：Vortex Structures Large Scale Instability Small Scale Helical Force AKA-Effect
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.
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