Abstract
The force acting on a fish-like body with combined thickness and lifting effects is analysed on the assumption of inviscid flow. A general expression is developed for the pressure force on the body, which is analogous to the momentum-flux analysis for non-lifting bodies in classical hydrodynamics. For bodies with constant volume, the mean drag (or propulsive) force is expressed in terms of a contour integral around the vortex sheet behind the body. Attention is focused on the case of steady-state motion with constant angle of attack, and the induced drag is analysed for finned axisymmetric bodies using the slender-body approximation developed by Newman & Wu (1973). Unlike earlier results of Lighthill (1970), the lift–drag ratio in this case depends on the body thickness.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference5 articles.
1. Lighthill, M. J. 1971 Large-amplitude elongated-body theory of fish locomotion.Proc. Roy. Soc. B 179,125–138.
2. Lighthill, M. J. 1970 Aquatic animal propulsion of high hydromechanical efficiency.J. Fluid Mech. 44,265–300.
3. Lighthill, M. J. 1960 Note on the swimming of slender fish.J. Fluid Mech. 9,305–317.
4. Wu, T. Y. & Newman, J. N. 1972 Unsteady flow around a slender fish-like body. Proc. International Symposium on Directional Stability and Control of Bodies Moving in Water. London:Institution of Mechanical Engineers.
5. Newman, J. N. & Wu, T. Y. 1973 A generalized slender-body theory for fish-like forms.J. Fluid Mech. 57,673–693.
Cited by
31 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献