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Most efficient anguilliform swimmer (front view)

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Three-dimensional simulation of a swimmer characterized by anguilliform gait and optimally shaped for energy efficiency. Colors indicate positive (red) and negative (blue) vorticity.
Bibliography:
1) W. van Rees, M. Gazzola, and P. Koumoutsakos. Optimal shapes for anguilliform swimmers at intermediate Reynolds numbers. Journal of Fluid Mechanics, 722:R3, 2013.