Wake symmetry impacts the performance of tandem hydrofoils during in-phase and out-of-phase oscillations differently

Physical Review. E
Ahmet Gungor, Arman Hemmati

Abstract

The hydrodynamics of two oscillating foils in side-by-side configuration is numerically investigated for in-phase and out-of-phase pitching at Reynolds number of 4000 and Strouhal numbers of St=0.25-0.5. The effects of phase difference (in-phase and out-of-phase) and Strouhal number on symmetric attributes of the wake and unsteady propulsive performance of the foils are studied in detail. At lower Strouhal numbers, there is a quasisteady performance in both thrust generation and power consumption, which coincides with persistence of the wake symmetry. As Strouhal number increases, however, in-phase and out-of-phase pitching display unsteady cycle-averaged behavior with very different wake characteristics. The asymmetric wake of in-phase pitching foils at high Strouhal numbers transitions to a quasisymmetric wake, when an extensive interaction between the two vortex streets is observed in the wake. This coincides with an improvement on the propulsive performance of the foils. In contrast, the symmetric wake of the out-of-phase pitching foils at a high Strouhal number transitions to an asymmetric wake. The adverse effect of this transition is only observed on the propulsive performance of one foil while the other exploits the wak...Continue Reading

References

Mar 21, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Ramiro Godoy-DianaJosé Eduardo Wesfreid
Nov 1, 2016·Journal of the Royal Society, Interface·I AshrafB Thiria
Aug 26, 2017·Proceedings of the National Academy of Sciences of the United States of America·Intesaaf AshrafBenjamin Thiria
Jun 20, 2018·Proceedings of the National Academy of Sciences of the United States of America·Daniel FloryanAlexander J Smits

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Citations

Feb 12, 2021·Bioinspiration & Biomimetics·Ahmet Gungor, Arman Hemmati

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