Undulatory and oscillatory swimming

摘要: Theory and modelling remain central to improving our understanding of undulatory oscillatory swimming. Simple models based on added mass can help give great insight into the mechanics swimming, as demonstrated by animals such eels, stingrays knifefish. To understand swimming swimmers tuna dolphins, need consider both forces circulatory forces. For all types experiments theory agree that most important velocity scale is characteristic lateral tail motion rather than speed, which erases a large extent difference between results obtained in tethered mode, compared those using free condition. There no one-to-one connection integrated performance details wake structure, similar levels efficiency occur with very different structures. Flexibility viscous effects play crucial roles determining efficiency, for isolated propulsors changing profile shape significantly improve thrust efficiency. Also, combined heave pitch motions an appropriate phase are essential achieve high performance. Reducing aspect ratio will always reduce but its now reasonably well understood. Planform have mitigating influence, do non-sinusoidal gaits intermittent actuation.