the growing process of the vortex structure at the location close to the wall surface and Movement-Fluid-Structure Interaction Mechanism

研究物体壁面涡旋结构的发展过程是非常重要和有趣的，因为涡旋结构直接影响到尾迹结构和对物体的流动力。特别是对于壁面变形的运动物体，如弹性翼型，需要进行精确的研究。本课题采用流动显示、PIV测量和数值研究相结合的方法，研究了运动弹性翼型壁面附近涡结构的发展过程。结果表明，作用在弹性翼型上的动态推力在很大程度上依赖于基于垂荡幅度和后缘频率的斯特劳哈尔数。此外，垂荡的弹性翼型通过壁面变形从前缘向后缘发展出与垂荡刚性翼型不同的涡流。

It is very important and interesting to study growing process of vortex structure on the wall surface of a body because the vortex structure affects the wake structure and flow force on the body in a direct fashion. Especially on a moving body with deforming wall surface such as a elastic airfoil, the precise study is needed. In this project, the growing process of the vortex structure at the location close to the wall surface of the moving elastic airfoil has been studied by flow visualization and PIV measurement as well as numerical studies. As a result, it is verified that dynamic thrust acting on elastic airfoils is much dependent on the Strouhal number based on heaving amplitude and frequency of the trailing edge. Moreover, the heaving elastic airfoils develop the vortex with the characteristics different from heaving rigid airfoils from the leading edge toward the trailing edge by wall deformation