Analysis of vortex merging from a rotating tank laboratory experiment

IF 3.8 3区 地球科学 Q1 OCEANOGRAPHY
Minghan Fu , Guoqing Han , Xiaojie Lu , Wenjin Sun , Joel Sommeria , Alexandre Stegner , Rui M.A. Caldeira , Changming Dong
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Abstract

Oceanic vortex merging is an important physical process for the vortex evolution and its impact on marine environment. However, limitation of the in-situ oceanic observational data of vortex merging inhabits its better understanding. This study investigates the interactions between non-ideal vortices in a four-vortex flow field in a rotating tank. We examine the merging stages of anticyclonic vortices, influenced by two other cyclonic vortices and their respective dynamical behaviors and quantify the effects of merging on vortex characteristics. The results indicate a strong shear flow between two counter-rotating vortices, which accelerates the motion of the anticyclonic vortex, while cyclonic ones exhibit greater stability. Subsequently, different stages of non-ideal vortex merging in a co-rotating framework are defined, primarily the encircling stage, rapid approaching stage, and merging vortex stage. In addition, we quantify and compare variations in morphological parameters and anti-symmetric vorticity distribution of non-ideal vortices across these stages. The stretching of vortices primarily occurs along the line connecting their centers due to the strain field exerted by neighboring vortices, resulting in an asymmetric stretching pattern in the interactions among non-ideal vortices. Furthermore, during the merging process, non-ideal vortices disperse vorticity outward and accumulate vortex filaments in the surrounding environment, leading to distinctive variations in anti-symmetric vorticity distribution, affecting their respective merging efficiency.

旋转水槽实验室实验的涡流合并分析
海洋涡流合并是涡流演变及其对海洋环境影响的一个重要物理过程。然而,对涡流合并的现场海洋观测数据的限制妨碍了对其更好的理解。本研究探讨了旋转水槽中四涡流场非理想涡旋之间的相互作用。我们研究了反气旋涡旋受另外两个气旋涡旋影响的合并阶段及其各自的动力学行为,并量化了合并对涡旋特性的影响。结果表明,两个反向旋转涡旋之间的剪切流很强,这加速了反气旋涡旋的运动,而气旋涡旋则表现出更大的稳定性。随后,我们定义了同向旋转框架下非理想涡合并的不同阶段,主要是包围阶段、快速接近阶段和涡合并阶段。此外,我们还量化和比较了非理想涡旋在这些阶段的形态参数和反对称涡度分布的变化。由于相邻涡旋施加的应变场,涡旋的拉伸主要发生在连接其中心的直线上,从而导致非理想涡旋之间的相互作用出现非对称拉伸模式。此外,在合并过程中,非理想涡向外扩散涡度,并在周围环境中积累涡丝,从而导致反对称涡度分布的明显变化,影响各自的合并效率。
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来源期刊
Progress in Oceanography
Progress in Oceanography 地学-海洋学
CiteScore
7.20
自引率
4.90%
发文量
138
审稿时长
3 months
期刊介绍: Progress in Oceanography publishes the longer, more comprehensive papers that most oceanographers feel are necessary, on occasion, to do justice to their work. Contributions are generally either a review of an aspect of oceanography or a treatise on an expanding oceanographic subject. The articles cover the entire spectrum of disciplines within the science of oceanography. Occasionally volumes are devoted to collections of papers and conference proceedings of exceptional interest. Essential reading for all oceanographers.
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