Abstract
Much effort has been undertaken to elucidate unsteadiness in propulsion in swimming, because a quasi-steady-state approach has led to errors in predicting the fluid forces acting on a hand. It has been noted that the unsteady fluid force plays an important role in an S-shaped pull or a sculling motion of swimmer. In the present study, the vortex structure and its behavior of a discoid airfoil simulating a swimmer's hand are investigated during pitch-oscillating motion in a wind tunnel test. The vortical flow fields were measured by the scanning PIV technique. The vortex ring is successively shed downstream under stationary conditions. Furthermore, the vortex ring inclines as the angle of attack of the airfoil changes, and the inclined angle becomes smaller as the vortex ring travels downstream. On the contrary, the vortex growth is observed during pitch-oscillating motion, and large scale vortex releases into the wake close to the airfoil. The vortex becomes larger as increasing the reduced frequency.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: The Proceedings of Mechanical Engineering Congress, Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
