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Rapid pivot feeding in pipefish: flow effects on prey and evaluation of simple dynamic modelling via computational fluid dynamics
Van Wassenbergh, S.; Aerts, P. (2008). Rapid pivot feeding in pipefish: flow effects on prey and evaluation of simple dynamic modelling via computational fluid dynamics. J. R. Soc. Interface 5(28): 1291-1301. dx.doi.org/10.1098/rsif.2008.0101
In: Journal of the Royal Society. Interface. The Royal Society: London. ISSN 1742-5689; e-ISSN 1742-5662, more
Peer reviewed article  
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Keywords
    Computational fluid dynamics
    Feeding
    Physics > Mechanics > Fluid mechanics > Hydrodynamics
    Syngnathidae Bonaparte, 1831 [WoRMS]
    Marine/Coastal
Author keywords
    feeding Syngnathidae computational fluid dynamics hydrodynamics unsteady rotation
Authors  Top 
  • Van Wassenbergh, S., more
  • Aerts, P., more
Abstract
    Most theoretical models of unsteady aquatic movement in organisms assume that including steady-state drag force and added mass approximates the hydrodynamic force exerted on an organism’s body. However, animals often perform explosively quick movements where high accelerations are realized in a few milliseconds and are followed closely by rapid decelerations. For such highly unsteady movements, the accuracy of this modelling approach may be limited. This type of movement can be found during pivot feeding in pipefish that abruptly rotate their head and snout towards prey. We used computational fluid dynamics (CFD) to validate a simple analytical model of cranial rotation in pipefish. CFD simulations also allowed us to assess prey displacement by head rotation. CFD showed that the analytical model accurately calculates the forces exerted on the pipefish. Although the initial phase of acceleration changes the flow patterns during the subsequent deceleration phase, the accuracy of the analytical model was not reduced during this deceleration phase. Our analysis also showed that prey are left approximately stationary despite the quickly approaching pipefish snout. This suggests that pivot-feeding fish need little or no suction to compensate for the effects of the flow induced by cranial rotation.
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