The vortex structure and hydrodynamics of undulating fins propulsion

摘要：

　　The Gymnarchus Niloticus fish(GNF) with long dorsal-fin torsional wave propulsion generally cruises with high efficiency and extra-ordinal maneuverability while keeping its body for straight line.In the paper the unsteady flow field of torsional wave propulsion is calculated by Large Eddy Simulation and dynamic grid technique with diffusion-based smoothing model.The results at wave amplitude 30° indicates there are three kinds of vortexes in the flow field, i.e.streamwise vortex, crescent vortex and toroidal vortex.Vortex characteristic and its temporal and spatial evolution is described, and the vortex structure and its relationship with thrust, heave force is analyzed.

关键词： undulating fins bionic propulsion numerical simulation vortex structure

作者: Yaqiang Bai Jun Zhang Shucheng Zhai Enbao Ding

作者单位: China ship scientific research center Wuxi, 214082, China

会议类型: 国际会议

会议名称: The Second Conference of Global Chinese Scholars on Hydrodynamics(第二届全球华人水动学学术会议)

会议地点: 江苏 无锡

会议语种:英文

页码: 829-837

在线出版日期: 2016-11-11（万方平台首次上网日期，不代表论文的发表时间）