[2606.00063] Linear Motility Maps in Nonlinear Viscous Fluids
[Submitted on 19 May 2026]
Title:Linear Motility Maps in Nonlinear Viscous Fluids
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Abstract:Systems moving in low Reynolds number fluid regimes are known to be governed by a `motility map'' which linearly relates their shape change rates to they body frame velocity moving through the fluid. A consequence of this is Purcell's Scallop Theorem'' -- a locomotion system that undergoes shape changes that follow the same path forward and backward in time (reciprocal body deformations) cannot achieve net displacement, regardless of pacing of those this http URL show that linear-in-velocity motility maps extend to any power law viscosity (a.k.a. Ostwald--de Waele fluid), and therefore to many biological fluids in intermediate shear ranges. We also show that the linear-in-velocity property can be violated in Carreau-Yasuda fluids to produce net motion using an inchworm'' model consisting of two unequal masses with unequal drag coefficients performing reciprocal motions. Interestingly, the direction of motion can be switched by changing speeds. Our results show that the linear motility map of geometric mechaincs can be used to analyze and design locomotion in power-law fluids, and that some nonlinear drag relationships such as Carreau-Yasuda can be exploited to generate net locomotion in seeming violation of the `scallop theorem''.
Subjects:
Robotics (cs.RO); Mathematical Physics (math-ph); Fluid Dynamics (physics.flu-dyn)
Cite as: arXiv:2606.00063 [cs.RO]
(or arXiv:2606.00063v1 [cs.RO] for this version)
https://doi.org/10.48550/arXiv.2606.00063
arXiv-issued DOI via DataCite
Submission history
From: Yishun Zhou [view email] [v1] Tue, 19 May 2026 19:56:42 UTC (437 KB)
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