Fluid Mechanics Research

拟议研究的目的是促进对以下流体力学基本问题的了解。 1.湍流结构和湍流混合：i)切变湍流中连续点源的被动标量弥散的测量。研究内容包括：a)剪切湍流中的Al混合层；ii)在剪切湍流中嵌入的热混合层中温度涨落的概率密度函数和精细结构特性的测量；iii)USF中相干结构与静止和移动壁面附近结构的相互作用。 2.涡动力学：1)翼尖涡与自由流湍流的相互作用；2)强迫周期和随机激励下的涡不稳定；3)运动壁面附近的涡脱落。 3.心血管力学：i)体外研究双叶机械瓣膜附近的血液流动，通过生理上精确的主动脉模型；ii)犬心脏中血液流动和心肌运动的数值模拟；iii)隔膜式心脏辅助装置中血液流动的数值模拟。 这项关于基本工程问题的长期研究将与有助于解决核工业和航空航天工业紧迫技术问题的实验和计算研究并行进行，该研究由NSERC和该行业的CRD赠款资助，与本提议无关。

The objective of the proposed research is to contribute to knowledge in the following fundamental problems of fluid mechanics. 1. Turbulence structure and turbulent mixing: i) measurements of passive scalar dispersion from a continuous point source in sheared turbulence. al mixing layer in sheared turbulence; ii) measurements of probability density functions and fine-structure properties of temperature fluctuations in a thermal mixing layer embedded in sheared turbulence; iii) interactions of coherent structures in USF with structures near stationary and moving walls. 2. Vortex dynamics: i) interactions between a wing-tip vortex and free-stream turbulence; ii) vortex instability under forced periodic and random excitations; iii) vortex shedding near a moving wall. 3. Cardiovascular mechanics: i) in vitro studies of blood flow near a bileaflet mechanical heart valve in pulsatile flow through a physiologically accurate model of the aorta; ii) numerical simulations of blood flow and myocardium motion in the canine heart; iii) numerical simulations of blood flow in diaphragm-type ventricular assist devices. This long-term research on fundamental engineering problems will be conducted in parallel with experimental and computational research contributing to the solution of pressing technological problems of the nuclear and aerospace industries, which is financed by CRD grants by NSERC and the Industry and is unrelated to the present proposal.