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Dynamics of rigid bodies in a two dimensional incompressible perfect fluid

Glass, Olivier; Lacave, Christophe; Munnier, Alexandre; Sueur, Franck (2019), Dynamics of rigid bodies in a two dimensional incompressible perfect fluid, Journal of Differential Equations, 267, 6, p. 3561-3577. 10.1016/j.jde.2019.04.017

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Type
Article accepté pour publication ou publié
Date
2019
Journal name
Journal of Differential Equations
Volume
267
Number
6
Publisher
Elsevier
Pages
3561-3577
Publication identifier
10.1016/j.jde.2019.04.017
Metadata
Show full item record
Author(s)
Glass, Olivier
CEntre de REcherches en MAthématiques de la DEcision [CEREMADE]
Lacave, Christophe cc
Institut Fourier [IF ]
Munnier, Alexandre
Institut Élie Cartan de Lorraine [IECL]
Sueur, Franck
Institut de Mathématiques de Bordeaux [IMB]
Abstract (EN)
We consider the motion of several rigid bodies immersed in a two-dimensional incompressible perfect fluid, the whole system being bounded by an external impermeable fixed boundary. The fluid motion is described by the incompressible Euler equations and the motion of the rigid bodies is given by Newton's laws with forces due to the fluid pressure. We prove that, for smooth solutions, Newton's equations can be recast as a second-order ODE for the degrees of freedom of the rigid bodies with coefficients depending on the fluid vorticity and on the circulations around the bodies, but not anymore on the fluid pressure. This reformulation highlights geodesic aspects linked to the added mass effect, gyroscopic features generalizing the Kutta-Joukowski-type lift force, including body-body interactions through the potential flows induced by the bodies' motions, body-body interactions through the irrotational flows induced by the bodies' circulations, and interactions between the bodies and the fluid vorticity.
Subjects / Keywords
rigid bodies; Euler equations

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