题目：Similar sensitivities of drag and unsteadiness to boundary perturbations

报告人：Dr. Xuerui Mao

时 间：8月2日（周五）上午10：30
地 点：澳门太阳娱乐网站官网1#楼212会议室
主持人：陶建军

报告内容摘要：
    Boundary perturbations in flow past a bluff body can be classified as active perturbations (blowing and suction) and passive perturbations (wall roughness). These perturbations are assumed to be small in magnitude and therefore can be modeled as Dirichlet-type boundary conditions of the linearized NS equation. The sensitivities of both unsteadiness (energy fluctuation) and forces acting on the bluff body to boundary perturbations are analytically demonstrated to be highly correlated, indicating that controlling unsteadiness is almost equivalent with controlling the forces. The flow around a circular cylinder is adopted to present this theoretical prediction. The sensitivity of turbulences to wall roughness will be also discussed.

报告人简介：
    Xuerui Mao joined the School of Engineering and Computing Sciences in Durham University as a lecturer in Fluid Mechanics and Turbomachinery in Sep, 2012. After receiving PhD from Imperial College London in 2011, he spent one year as a research fellow in Monash University and then worked half a year in LadHyX, Ecole Polytechnique. His research interests include h/p spectral element method, hydrodynamics, optimal flow control, computational acoustics and turbomachinery.