# Asymptotic behaviour of a system modelling rigid structures floating in a viscous fluid

Vergara-Hermosilla, Gastón and Matignon, Denis and Tucsnak, Marius Asymptotic behaviour of a system modelling rigid structures floating in a viscous fluid. (2021) In: Mathematical Theory of Networks and Systems, August 2021 - August 2021 (Cambridge, United Kingdom).

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Official URL: https://doi.org/10.1016/j.ifacol.2021.06.146

## Abstract

The PDE system introduced in Maity et al. (2019) describes the interaction of surface water waves with a floating solid, and takes into account the viscosity µ of the fluid. In this work, we study the Cummins type integro-differential equation for unbounded domains, that arises when the system is linearized around equilibrium conditions. A proof of the input-output stability of the system is given, thanks to a diffusive representation of the generalized fractional operator $\sqrt{1 + \mu s}$. Moreover, relying on Matignon (1996) stability result for fractional systems, explicit solutions are established both in the frequency and the time domains, leading to an explicit knowledge of the decay rate of the solution. Finally, numerical evidence is provided of the transition between different decay rates as a function of the viscosity $\mu$.

Item Type: Conference or Workshop Item (Paper) hal-03349704 International conference proceedings Other partners > Bordeaux INP - BINP (FRANCE)French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)Other partners > Université de Bordeaux (FRANCE) download 20 Sep 2021 14:01

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