Fluid Mechanics Research

提出的工作的具体目标是：a)研究多结构湍流，记录能量耗散的尺度，并仔细检查湍流理论中基本假设的有效性；B)研究自由流中的各向异性剪切湍流与静止或运动壁面产生的湍流之间的相互作用；C)记录湍流结构、旁通转换和再层化、来自集中源的标量输运、来自壁面的热量传递和来自内部物体的旋涡脱落；d)将泰勒湍流扩散理论推广到发展和多结构流动中，设计优化标量扩散和混合的条件，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)实验研究了横向扰动和流向扰动对涡旋稳定性和击穿的影响，详细记录了湍流自由流中流向涡旋和相干结构之间的相互作用；F)修改现有的模拟循环回路，使其能够再现生理冠状动脉血流，并在冠状动脉入口附近的主动脉解剖模型中收集速度测量值，用于人工心脏瓣膜的不同方向。

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.