Propulsive performance of unsteady tandem hydrofoils in an in-line configuration

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Optimal undulatory swimming for a single fish-like body and for a pair of interacting swimmers (2016, result): “The results presented in this section are consistent with the experimental results from thrust producing rigid pitching foils in an in-line configuration (Boschitsch et al. 2014).”
Computational analysis of vortex dynamics and performance enhancement due to body–fin and fin–fin interactions in fish-like locomotion (2017, background): “Experimental and computational studies on rigid hydrofoils also showed that multiple foils in tandem can improve swimming performance when their movements are oﬀset with the correct phase angle (Akhtar et al. (2007); Boschitsch et al. (2014)).”
Flow interactions lead to orderly formations of flapping wings in forward flight (2016, background): “Studies of tandem wings held at fixed separation and immersed in an imposed flow show that the force generated by a follower depends on its interaction with vortices shed by its upstream neighbor [17,19,21,22].”