Wall Turbulence

摘要 提案编号：CTS-9806265 主要研究者：Hanratty 这是一个赠款，继续研究湍流产生的流动超过固体边界。 目标是确定湍流是如何产生的，如何控制和改变湍流，如何预测雷诺应力。 研究的一个重要特点是，它使用直接数值模拟（DNS），脉冲图像测速（PIV），双组分激光多普勒测速（LDV），和一个专门建造的湍流光学研究设施。 主要的推力是发展一个概念框架壁湍流，可以用来分析复杂的流动，并确定如何湍流可以修改。 所采取的方法是考虑结构和动力学的应力产生涡流。 将研究（1）“简单”壁湍流，如通道中充分发展的流动，（2）静止或运动波状边界上的流动，（3）减阻聚合物或表面活性剂溶液的流动，（4）结构化边界上的流动，（5）大振幅振荡的流动。 1 1

Abstract Proposal Number: CTS-9806265 Principal Investigator: Hanratty This is a grant to continue research on turbulence generated by flow over a solid boundary. The goals are the determination of how turbulence is produced, of how to control and change turbulence, of how to predict Reynolds stresses. An important feature of the research is that it uses direct numerical simulations (DNS), pulsed-image velocimetry (PIV), two-component laser-Doppler velocimetry (LDV), and a specially constructed facility for optical studies of turbulence. The chief thrust is to develop a conceptual framework for wall turbulence which can be used to analyze complex flows and to determine how turbulence can be modified. The approach taken is to consider the structure and dynamics of stress producing eddies. Studies will be made of (1) "simple" wall turbulence, such as fully developed flow in a channel, (2) flow over a stationary or moving wavy boundary, (3) flow of solutions of drag-reducing polymers or surfactants, (4) flows over structured boundaries, (5) flows with large amplitude imposed oscillations. 1 1