Experimental and Computational Study of Vortex Rings in Water Subject to Coriolis Forces induced by Background System Rotation - 1=Engineering

背景系统旋转引起的科里奥利力作用下水中涡环的实验和计算研究 - 1=工程

• 批准号: 2401575
• 金额: --
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2401575
• 关键词: Experimental; Computational; Study; Vortex; Rings

The goal of the proposed project is to investigate the fundamental physics governing the dynamics of vortex rings subject to background system rotation. The dynamics of vortices affect the vast majority of applied engineering problems involving liquids or gases. Vortex rings are a geometrically simple vortex structure that has served for decades as a paradigm to study general issues associate with physics governing the formation, the motion, the stability and the laminar-turbulent transition of vortices. Vortices are also the fundamental flow structures underlying and governing fluid turbulence. Turbulence is considered to be the outstanding unresolved problem of classical mechanics.Coriolis forces associated with background system rotation fundamentally alter fluid flows and lead to many counterintuitive phenomena entirely unknown in non-rotating flows. Rotating flows are prevalent in applied engineering contexts. The effects of background rotation on vortex rings are an essentially entirely unexplored research area. One of the only existing publications is by the project supervisor Prof. P.J. Thomas. The reason why publications on the subject are scarce is because only a very small number of laboratories have the required infrastructure available to perform the necessary experiments. Since our previous publication, the relevant measurement techniques (Particle Image Velocimetry ) required to obtain data for the problem considered have substantially advanced. It is therefore timely to readdress the issue of the effects of Coriolis forces on the dynamics of vortex rings by means of modern state-of-the-art measurement methodologies. In our previous publication many new flow phenomena were identified qualitatively but, at the time, had to remain unexplored in detail since the computer-aided measurement technology had not advanced to a stage that enabled the required quantitative measurements. However, these measurements can now be performed and it is planned to conduct these and compare the data to be obtained to results of concurrent computational simulations.

拟议项目的目标是研究控制涡环受背景系统旋转影响的动力学的基本物理。涡旋的动力学影响着绝大多数涉及液体或气体的应用工程问题。涡环是一种几何上简单的涡旋结构，几十年来一直被用作研究与物理有关的与涡旋的形成、运动、稳定性和层流-湍流转变相关的一般问题的范例。旋涡也是支撑和支配流体湍流的基本流动结构。湍流被认为是经典力学中尚未解决的突出问题，与背景系统旋转相关的科里奥利力从根本上改变了流体流动，导致了许多在非旋转流动中完全不存在的反直觉现象。旋转流动在应用工程环境中很普遍。背景旋转对涡环的影响基本上是一个完全未被探索的研究领域。现存的仅有的出版物之一是项目主管P.J.托马斯教授。关于这一主题的出版物之所以很少，是因为只有极少数的实验室拥有进行必要实验所需的基础设施。自从我们上一次发表以来，获得所考虑问题的数据所需的相关测量技术(粒子图像测速)已经有了很大的进步。因此，用现代最先进的测量方法重新讨论科里奥利力对涡环动力学的影响问题是及时的。在我们之前的出版物中，定性地发现了许多新的流动现象，但当时由于计算机辅助测量技术还没有发展到能够进行所需定量测量的阶段，因此不得不保持不详细的探索。然而，现在可以进行这些测量，并计划进行这些测量，并将获得的数据与并行计算模拟的结果进行比较。