Fluid Mechanics Research

本论文的具体目标是：（a）研究多结构湍流，记录能量耗散的标度，并仔细检查湍流理论中基本假设的有效性：（B）研究自由流中各向异性剪切湍流与静止或运动壁产生的湍流之间的相互作用; c）记录湍流结构、旁路转捩和再层化、来自集中源的标量输运、来自壁面的热传递和来自瞬时加速和减速槽道流中内部物体的旋涡脱落; d）将泰勒湍流扩散理论推广到发展中的和多结构的流动，设计优化标量扩散和混合的条件，并研究施密特/普朗特数对标量精细结构和微分扩散发展的影响; e）在横向和流向扰动的影响下，对涡流稳定性和破裂进行实验研究，并详细记录了湍流自由流中流向涡和相干结构之间的相互作用; f）的以使其再现生理冠状动脉流动，并针对假体心脏的不同取向在冠状动脉入口附近的主动脉的解剖模型中收集速度测量值阀.

The specific objectives of the proposed work are: a) to investigate multi-structure turbulence, to document the scaling of energy dissipation and to scrutinize the validity of fundamental assumptions in turbulence theory; b) to study the interaction between anisotropic, sheared turbulence in the free stream and turbulence generated by a stationary or moving wall; c) to document the turbulence structure, by-pass transition and relaminarisation, scalar transport from concentrated sources, heat transfer from the wall and vortex shedding from internal objects in temporally accelerating and decelerating channel flows; d) to extend Taylorian turbulent diffusion theory to developing and multi-structure flows, to devise conditions that optimize scalar diffusion and mixing and to investigate the effect of Schmidt/Prandtl number on the scalar fine structure and the development of differential diffusion; e) to study experimentally vortex stability and breakdown under the influence of transverse and streamwise disturbances, and to document in detail the mutual interactions between a streamwise vortex and coherent structures in a turbulent free stream; f) to modify an existing mock circulation loop so that it reproduces physiological coronary flows and to collect velocity measurements in an anatomical model of the aorta near the coronary inlet for different orientations of a prosthetic heart valve.