Aerodynamics of Complex Bluff Bodies in Ground Proximity

本文的研究重点是近地复杂钝体空气动力学的实验和数值研究。我们之所以无法准确预测气动阻力和复杂钝体尾迹，是因为我们对复杂体上的湍流现象还没有很好地了解。因此，申请人提出了一项新的实验研究计划，以提供有关复杂钝体（如皮卡和拖车）空气动力学的全面高质量数据。拟议的研究将采用最先进的测量技术，在全尺寸和小尺寸风洞中获得高质量的速度、压力和力数据。然后将采用先进的数据分析技术来揭示旋涡结构，并探索这些结构在阻力产生机制中的动态作用。该研究还将应用计算流体动力学软件和不同复杂程度的数值模型来分析这些流动。全面的高质量数据、物理洞察力和精细的数值模型将有助于为现有道路车辆开发具有成本效益的减阻装置。此外，它还将促进车辆设计工程师开发成本有效的减阻策略，以改善未来车辆的空气动力学。这将显著提高车辆的燃油经济性，对经济、环境和能源安全产生巨大影响。因此，这项研究在提高加拿大在汽车工业的竞争力方面具有很大的潜力。它也有机会培养下一代工程师、研究人员和加拿大所需的基本技能。

The proposed research focuses on experimental and numerical study of aerodynamics of complex bluff bodies in ground proximity. Our inability to accurately predict aerodynamic drag and complex bluff body wakes is due to the fact that turbulent flow phenomena over complex bodies are not well understood. Therefore, the applicant is proposing a novel experimental research program to provide a comprehensive high quality data on the aerodynamics of complex bluff bodies such as pickup and trailer trucks. The proposed research will employ state-of-the-art measurement techniques to obtain high quality velocity, pressure and force data in full scale and small scale wind tunnels. Advanced data analysis techniques will then be employed to reveal the vortical structure and explore the dynamic roles of these structures in the drag production mechanism. The research will also apply computational fluid dynamics software and numerical models with varying sophistication to analyze these flows. The comprehensive high quality data, physical insight and refined numerical models will facilitate the development of cost effective drag reduction devices for existing road vehicles. In addition, it will facilitate the development of cost effective drag reduction strategies for vehicle design engineers to improve the aerodynamics of future vehicles. This will significantly improve fuel economy on vehicles with tremendous impact on the economy, environment and energy security. This research therefore has the promising potential to enhance Canada's competitiveness in the automotive industry. It also has the opportunity to nurture the next generation of engineers, researchers and the essential skills needed in Canada.