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Universal Self-Similar Attractor in the Bending-Driven Leveling of Thin Viscous Films

Abstract : We study theoretically and numerically the bending-driven leveling of thin viscous films within the lubrication approximation. We derive the Green's function of the linearized thin-film equation and further show that it represents a universal self-similar attractor at long times. As such, the rescaled perturbation of the film profile converges in time towards the rescaled Green's function, for any summable initial perturbation profile. In addition, for stepped axisymmetric initial conditions, we demonstrate the existence of another, short-term and one-dimensional-like self-similar regime. Besides, we characterize the convergence time towards the long-term universal attractor in terms of the relevant physical and geometrical parameters, and provide the local hydrodynamic fields and global elastic energy in the universal regime as functions of time. Finally, we extend our analysis to the non-linear thin-film equation through numerical simulations.
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https://hal.archives-ouvertes.fr/hal-03010250
Contributor : Thomas Salez Connect in order to contact the contributor
Submitted on : Monday, September 6, 2021 - 10:39:56 PM
Last modification on : Friday, October 8, 2021 - 3:39:59 PM

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  • HAL Id : hal-03010250, version 3
  • ARXIV : 2011.10297

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Christian Pedersen, Thomas Salez, Andreas Carlson. Universal Self-Similar Attractor in the Bending-Driven Leveling of Thin Viscous Films. Proceedings of the Royal Society of London. Series A, Mathematical and physical sciences, Royal Society, The, 2021, 477, pp.20210354. ⟨hal-03010250v3⟩

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