no. 1
Optimal strokes for the 4-sphere swimmer at low Reynolds number in the regime of small deformations
Alouges, François1 ; Lefebvre-Lepot, Aline1 ; Weder, Philipp2
1 CMAP, Ecole polytechnique et CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
2 EPFL, Rue Louis-Favre 4, CH-1024 Ecublens, Switzerland
MathematicS In Action, Tome 11 (2022) no. 1, pp. 167-192.

The paper deals with the optimal control problem that arises when one studies the 4 sphere artificial swimmer at low Reynolds number. Composed of four spheres at the end of extensible arms, the swimmer is known to be able to swim in all directions and orientations in the 3D space. In this paper, optimal strokes, in terms of the energy expended by the swimmer to reach a prescribed net displacement, are fully described in the regime of small strokes. In particular, we introduce a bivector formalism to model the displacements that turns out to be elegant and practical. Numerical simulations are also provided that confirm the theoretical predictions.

Publié le :
DOI : 10.5802/msia.23
Classification : 15-04, 34H05, 49K15, 76Z10, 93C15
Mots clés : Low Reynolds number swimming, optimal strokes, periodic control
Alouges, François 1 ; Lefebvre-Lepot, Aline 1 ; Weder, Philipp 2

1 CMAP, Ecole polytechnique et CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
2 EPFL, Rue Louis-Favre 4, CH-1024 Ecublens, Switzerland 
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     title = {Optimal strokes for the 4-sphere swimmer at low {Reynolds} number in the regime of small deformations},
     journal = {MathematicS In Action},
     pages = {167--192},
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Alouges, François; Lefebvre-Lepot, Aline; Weder, Philipp. Optimal strokes for the 4-sphere swimmer at low Reynolds number in the regime of small deformations. MathematicS In Action, Tome 11 (2022) no. 1, pp. 167-192. doi : 10.5802/msia.23. http://www.numdam.org/articles/10.5802/msia.23/

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