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Article Dans Une Revue Physics of Fluids Année : 2024

Anisotropic frictional model for an object sliding in a granular media

Résumé

Several locomotion strategies are based on the anisotropic nature of the forces experienced by the moving body with its environment. We report experiments on the anisotropy of the frictional force experienced by a cylinder moving in a granular medium as a function of the orientation α between the cylinder and its velocity. The component of the force in the direction parallel to the velocity of the cylinder is always higher than the perpendicular component; therefore, the force is anisotropic. While the parallel component increases continuously with the cylinder angle α, we observe that the perpendicular component reaches a maximum value for an orientation of αc≃35°. To rationalize these observations, we have developed a theoretical model, which assumes that the mechanical energy required to move the cylinder is dissipated by friction and establishes a relationship between the parallel and perpendicular force components that is consistent with experiments.
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Dates et versions

hal-04447881 , version 1 (08-02-2024)

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René Zuñiga, Carlos Vasconcellos, Baptiste Darbois Texier, Francisco Melo. Anisotropic frictional model for an object sliding in a granular media. Physics of Fluids, 2024, 36 (1), ⟨10.1063/5.0188244⟩. ⟨hal-04447881⟩
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