Further insights into the dynamics and interactions of unsteady 3D vortical flows

非定常三维（3D）流动及其与流线型和钝体的相互作用无处不在，它们的表征对于理解各种基本和工业过程至关重要，例如；飞机推进、交通运输和风能发电。非定常三维旋涡结构具有复杂的多物理场流动现象和不稳定性。提出的研究计划的总体目标是进一步了解控制复杂三维涡旋现象及其与流线型和钝体相互作用的动力学和物理机制的现有基础知识。拟议的研究工作的结果将特别有利于航空航天工业（加拿大贝尔德事隆LTÉE，庞巴迪）和能源部门（魁北克水电，LM风能加拿大公司）的同行研究人员和专家最终用户。拟议的研究项目将主要在位于舍布鲁克大学（UDS）的大型风洞中进行。它有一个1.82米× 1.82米的封闭试验段，气流的最高速度约为30米/秒，在1.2米× 1.82米的缩小段可增加到42米/秒左右。最先进的流体诊断技术包括；利用热线风速法（HWA）和立体粒子图像测速法（PIV）研究非定常三维湍流结构的时空动力学。流动参数如；将评估雷诺数，自由流湍流，压力梯度，地面效应等。不同层次的高素质人才（博士、硕士和本科生）将接受广泛的培训，以获得加拿大许多高科技部门（航空航天、风能生产等）所需的先进技能和专业知识。HQP将受益于UDS机械工程系充满活力和激励的工作环境，其中提供先进的培训计划，以获得横向能力。

The unsteady three-dimensional (3D) flow and their interactions with streamlined and bluff bodies are omnipresent and their characterization is crucial for the understanding of various fundamental and industrial processes such as; aircraft propulsion, transportation and wind energy generation. Unsteady 3D vortical structures are essentially characterized by complex multi-physics flow phenomena and instabilities. The overarching objective of the proposed research program is to further the current fundamental knowledge on the dynamics and the physical mechanisms governing complex 3D vortical flow phenomena and their interactions with streamlined and bluff bodies. The outcome of the proposed research work would be particularly beneficial for peer researchers and expert end-users in aerospace industries (Bell Textron Canada LTÉE, Bombardier) and energy sector (Hydro Quebec, LM Wind Power Canada Inc). The proposed research program will be mainly conducted in the large wind tunnel located at the Université de Sherbrooke (UDS). It has a closed test section of 1.82 m x 1.82 m and a top speed of the air flow is around 30 m/s that can be increased to around 42 m/s in the reduced section of 1.2 m x 1.82 m. State-of-the-art flow diagnostics techniques including; Hot Wire Anemometry (HWA) and Stereoscopic Particle Image Velocimetry (PIV), will be used to elucidate the spatiotemporal dynamics of unsteady 3D turbulent structures. The effect of flow parameters such as; Reynolds number, free stream turbulence, pressure gradient, ground effect, etc., will be evaluated. Highly qualified personnel (HQP) of different levels (PhD, Master and Undergraduate students) will be extensively trained to gain advanced skills and expertise in demand from many high-technology sectors in Canada (aerospace, wind energy production, etc.). HQP will benefit from a dynamic and a stimulating working environment at the Department of Mechanical Engineering of the UDS wherein advanced training programs are offered to acquire transversal competencies.