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How shape and flapping rate affect the distribution of fluid forces on flexible hydrofoils

Published online by Cambridge University Press:  19 August 2020

Paule Dagenais Open the ORCID record for Paule Dagenais [Opens in a new window]  and
Christof M. Aegerter Open the ORCID record for Christof M. Aegerter [Opens in a new window]
Paule Dagenais
Affiliation:
Physik-Institut, University of Zurich, Winterthurerstrasse 190, 8057Zurich, Switzerland
Christof M. Aegerter*
Affiliation:
Physik-Institut, University of Zurich, Winterthurerstrasse 190, 8057Zurich, Switzerland
*
†Email address for correspondence: [email protected]
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Abstract

We address the fluid–structure interaction of flexible fin models oscillating in a water flow. Here, we investigate in particular the dependence of hydrodynamic force distributions on fin geometry and flapping frequency. For this purpose, we employ state-of-the-art techniques in pressure evaluation to describe fluid force maps with high temporal and spatial resolution on the deforming surfaces of the hydrofoils. Particle tracking velocimetry is used to measure the three-dimensional fluid velocity field, and the hydrodynamic stress tensor is subsequently calculated based on the Navier–Stokes equation. The shape and kinematics of the fin-like foils are linked to their ability to generate propulsive thrust efficiently, as well as the accumulation of external contact forces and the resulting internal tension throughout a flapping cycle.

Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 901 , 25 October 2020 , A1
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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References

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