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Hydrodynamics of tandem flapping pectoral fins with varying stroke phase offsets

Kaushik Sampath*

Jason D. Geder and Ravi Ramamurti

Marius D. Pruessner and Raymond Koehler

  • Acoustics Division, Code 7165, U.S. Naval Research Laboratory, Washington DC 20375, USA

  • Laboratories for Computational Physics and Fluid Dynamics, Code 6041, U.S. Naval Research Laboratory, Washington DC 20375, USA

  • U.S. Naval Research Laboratory, Center for Bio/Molecular Science & Engineering, Code 6930, Washington DC 20375, USA

  • *kaushik.sampath@nrl.navy.mil
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Phys. Rev. Fluids 5, 094101 – Published 22 September, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.094101

Abstract

We show how phasing between tandem bioinspired fins flapping at high-stroke amplitudes modulates rear fin thrust production and wake characteristics. Load cell thrust measurements show that the rear fin generates 25% more thrust than the front fin when it lags the latter by a quarter cycle, and performs 8% worse when it leads the front fin by the same amount. The flow interactions between the fins responsible for these observations are analyzed using two-dimensional particle image velocimetry measurements and three-dimensional computational fluid dynamics simulations. Distributions of velocity elucidate variations in the effective flow induced on the rear fin for different phase offsets. Vortex structure interactions and particle rakes reveal the contributions of the leading- and trailing-edge vortices shed by the front fin in modulating the suction at the rear fin leading edge. Furthermore, the wake structure far downstream of the fins changes in its coherence, axial and radial extents for the different phase offsets. These findings are relevant for the design and performance optimization of various unmanned underwater vehicles that utilize such tandem systems.

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Outline

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Phys. Rev. Fluids 5, 094101– Published 22 September, 2020
  • Received 29 March 2020
  • Accepted 17 August 2020
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