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Motion of an Elastic Solid inside an Incompressible Viscous Fluid

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Abstract.

The motion of an elastic solid inside an incompressible viscous fluid is ubiquitous in nature. Mathematically, such motion is described by a PDE system that couples the parabolic and hyperbolic phases, the latter inducing a loss of regularity which has left the basic question of existence open until now.

In this paper, we prove the existence and uniqueness of such motions (locally in time), when the elastic solid is the linear Kirchhoff elastic material. The solution is found using a topological fixed-point theorem that requires the analysis of a linear problem consisting of the coupling between the time-dependent Navier-Stokes equations set in Lagrangian variables and the linear equations of elastodynamics, for which we prove the existence of a unique weak solution. We then establish the regularity of the weak solution; this regularity is obtained in function spaces that scale in a hyperbolic fashion in both the fluid and solid phases. Our functional framework is optimal, and provides the a priori estimates necessary for us to employ our fixed-point procedure.

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Authors and Affiliations

  1. Department of Mathematics, University of California at Davis, Davis, CA, 95616

    Daniel Coutand & Steve Shkoller

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  1. Daniel Coutand
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  2. Steve Shkoller
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Correspondence to Steve Shkoller.

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Communicated by V. Šverák

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Coutand, D., Shkoller, S. Motion of an Elastic Solid inside an Incompressible Viscous Fluid. Arch. Rational Mech. Anal. 176, 25–102 (2005). https://doi.org/10.1007/s00205-004-0340-7

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  • DOI: https://doi.org/10.1007/s00205-004-0340-7

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