Propulsive mechanism of forward and backward free swimming of angulla angulla
Eels can swim backward by reversing the direction of the traveling wave along the body. The propulsive mechanism of an eel, angulla angulla, during its free forward swimming and switching direction to backward swimming has been studied numerically. The problem is reasonably simplified to a loose-coupling problem of fish swimming dynamics and hydrodynamics only in the heading direction. The approach involves the simulation of the flow by solving the two-dimensional unsteady incompressible N-S equations and the solution of fish motion dynamics problem by the Newton’s Second Law. Visualizations of flow fields and vortex structures are presented. The results show that thrust is associated with vortex structures in the wake.
Key wordspropulsive mechanism Navier-stokes equations coupling problem
Unable to display preview. Download preview PDF.
- STAMHUIS E., VIDELER J. Quantitative flow analysis around aquatic animals using laser sheet particle image velocimetry[J]. J. Exp. Biol., 1995, 198: 283–294Google Scholar
- Müller, U. K., van den Heuvel, B. L. E., Stamhuis, J., Videler J. Fish foot prints: morphology and energetics of the wake behind a continuously swimming mullet (Chelon labrosus risso) [J]. J. Exp. Biol., 1997, 200: 2893–2906Google Scholar
- Wolfgang, M., Anderson, J.M., Grosenbaugh, M.A., Yue, D.K.P., Triantafyllou, M.S. Near-body flow dynamics in swimming fish[J]. J. Exp. Biol., 1999a, 202: 2303–2327Google Scholar
- Carling, J., Williams, T., and Bowtell, G. Self-propelled anguilliform swimming: simultaneous solution of the two-dimensional Navier-Stokes equations and Newton’s laws of motion. J. Exp. Biol., 1998, 201, 3143–3166.Google Scholar
- D’août K. and Aerts P. A kinematic comparision of forward and backward swimming in the eel anguilla anguilla[J]. J. Exp. Biol., 1999, 202:1511–1521Google Scholar