Deterministic Turbulence

确定性湍流

• 批准号: EP/M028690/1
• 负责人: Kwing-So Choi
• 金额: $ 80.56万
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FM028690%2F1
• 关键词: Deterministic; Turbulence

"Turbulence is the most important unsolved problem of classical physics" (Richard Feynman) due to its high non-linearity and chaotic behaviour. Therefore, it has been widely accepted that turbulence is not repeatable even with identical initial and boundary conditions (i.e. the butterfly effects). Recently, however, a Russian research group led by Prof Kachanov (Visiting Researcher of this proposal) observed a certain set of repeatable flows in a very late stage of laminar-to-turbulent transition, which can be considered as turbulence as far as its statistics are concerned. These are called deterministic turbulence. Unlike "ordinary" turbulence, the deterministic turbulence allows us to predict the exact time and location of turbulence events that take place in the flow. One can also go back the flow history to see the cause of turbulence events. This provides an exciting opportunity for turbulence research that has not been possible before. Here we propose to utilise the deterministic turbulence to better understand the turbulent boundary-layer structures with a view to develop an innovative strategy for turbulence control and optimise existing flow control techniques.

“湍流是经典物理学中最重要的未解决的问题”（理查德·费曼），因为它具有高度的非线性和混沌行为。因此，人们普遍认为，即使在相同的初始和边界条件下，湍流也是不可重复的（即蝴蝶效应）。然而，最近，由Kachanov教授（该提案的访问研究员）领导的俄罗斯研究小组在层流到湍流过渡的非常后期观察到了一组可重复的流动，就其统计而言，可以将其视为湍流。这些被称为确定性湍流。与“普通”湍流不同，确定性湍流允许我们预测流中发生的湍流事件的确切时间和位置。人们还可以追溯流动历史，以了解湍流事件的原因。这为湍流研究提供了一个令人兴奋的机会，这在以前是不可能的。在这里，我们建议利用确定性湍流，以更好地了解湍流边界层结构，以期开发一种创新的湍流控制策略，并优化现有的流量控制技术。

项目成果

Flow reversal in millimetric annular DBD plasma actuator

• DOI: 10.1088/1361-6463/ac0145
• 发表时间: 2021
• 期刊: Journal of Physics D: Applied Physics
• 作者: Huw Borradaile;Konstantinos Kourtzanidis;F. Rogier;K. Choi;X. Mao

Interplay of the leading-edge vortex and the tip vortex of a low-aspect-ratio thin wing

低展弦比薄翼前缘涡和尖端涡的相互作用

• DOI: 10.1007/s00348-020-03023-4
• 发表时间: 2020
• 期刊: Experiments in Fluids
• 影响因子: 2.4
• 作者: Dong L

New method of excitation of 3D instability modes in boundary layers and its application to experiments on control of unsteady Görtler vortices

边界层三维不稳定模态激励新方法及其在非定常Görtler涡控制实验中的应用

• DOI: 10.1063/1.5065211
• 发表时间: 2018
• 作者: Borodulin V

Output feedback control of flow separation over an aerofoil using plasma actuators

• 发表时间: 2018-11
• 期刊: International Journal of Numerical Analysis and Modeling
• 影响因子: 1.1
• 作者: R. Broglia;K. Choi;P. Houston;L. Pasquale;P. Zanchetta

Plasma virtual roughness elements for cross-flow instability control

• DOI: 10.1007/s00348-018-2609-x
• 发表时间: 2018-10
• 期刊: Experiments in Fluids
• 影响因子: 2.4
• 作者: K. Choi;Jung‐Hoon Kim