Wall Turbulence

申请号：CTS-9806265项目负责人：Hanratty这是一笔用于继续研究固体边界上流动产生的湍流的基金。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。该研究的一个重要特点是它使用了直接数值模拟（DNS）、脉冲图像测速（PIV）、双分量激光多普勒测速（LDV）和专门建造的湍流光学研究设施。主要目的是发展一个壁面湍流的概念框架，该框架可用于分析复杂的流动并确定如何修改湍流。所采取的方法是考虑产生应力的涡流的结构和动力学。研究将包括(1)“简单的”壁面湍流，如沟道中完全发育的流动，(2)在静止或移动的波浪边界上的流动，(3)减阻聚合物或表面活性剂溶液的流动，(4)在结构边界上的流动，(5)具有大振幅施加振荡的流动。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