Fully-Time-Resolved (FTR) Cinema-PIV Imaging of the Physics of Subgrid Turbulence

Dr. Drivel和合作伙伴Dr. Ceccio开发了一种时间分辨的Cinema-PIV（粒子图像速度）系统，能够每秒采集8，000张PIV图像。 在目前的提案中，他们建议使用这种新的仪器来研究湍流射流的特性，更具体地说，涡流的时间结构和演变及其与次网格应力和消散的关系。 实验将包括在水洞中向同向流动的水流中发出水射流。 更广泛的影响，这一建议将提高我们的能力，开发更好的亚网格尺度模型的湍流特性的预测，并在培训研究生在这个先进的仪器技术。 本研究所获得的知识将有助于三维电影-PIV系统的开发。

Dr. Driscoll and the Co-PI Dr. Ceccio have developed a time-resolved cinema-PIV(particle image velocity) system that is capable of acquiring 8,000 PIV images/second. In the current proposal, they propose to use this new instrumentation to study the characteristics of a turbulent jet, more specifically, the temporal structure and evolution of eddies and their relationship to the generation of subgrid stresses and dissapation. The experiments will consist of issuing a water jet into a co-flowing stream in a water tunnel. The broader impact of this proposal will be to improve our ability to develop better subgrid scale models for the prediction of the characteristics of turbulent flows, and in the training of graduate students in this advance instrumentation technique. Knowledge gained in this research will be useful in the development of 3D cinema-PIV system.