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• W3128778970 abstract "We present new experiments and free-swimming simulations of a pair of pitching hydrofoils interacting in a simple school. The hydrofoils have an out-of-phase synchronization and their arrangement is varied from in-line to side-by-side arrangements through a series of staggered arrangements representing the two-dimensional interaction plane. It is discovered that there is a two-dimensionally stable equilibrium point for a side-by-side arrangement. In fact, this arrangement is super-stable meaning that hydrodynamic forces will passively maintain this arrangement even under external perturbations and the school as a whole has no net forces acting on, drifting it to one side or the other. Moreover, previously discovered one-dimensionally stable equilibria driven by wake vortex interactions are shown to be, in fact, two-dimensionally unstable, at least for an out-of-phase synchronization. Additionally, the stable equilibrium arrangement is verified for freely-swimming foils undergoing dynamic recoil motions. When constrained, the swimmers experience a collective thrust and efficiency increase up to 100% and 40%, respectively, in a side-by-side arrangement. However, in a staggered arrangement where there is direct vortex impingement on a follower, an even higher efficiency improvement of 87% is observed, which is coupled with a 94% increase in the thrust. For freely-swimming foils, the recoil motion attenuates the performance improvements showing a more modest speed and efficiency enhancement of up to 9% and 6%, respectively, when the swimmers are at their stable equilibrium. These newfound schooling performance and stability characteristics suggest that fluid-mediated equilibria may play a role in the control strategies of schooling fish and fish-inspired robots." @default.
• W3128778970 created "2021-02-15" @default.
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• W3128778970 date "2021-02-06" @default.
• W3128778970 modified "2023-09-27" @default.
• W3128778970 title "Two-dimensionally stable self-organization arises in simple schooling swimmers through hydrodynamic interactions" @default.
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