Abstract
In this work we present a numerical framework to carry-out numerical simulations of fluid-structure interaction phenomena in free-surface flows. The framework employs a single-phase method to solve momentum equations and interface advection without solving the gas phase, an immersed boundary method (IBM) to represent the moving solid within the fluid matrix and a fluid structure interaction (FSI) algorithm to couple liquid and solid phases. The method is employed to study the case of a single point wave energy converter (WEC) device, studying its free decay and its response to progressive linear waves.
Highlights
The necessity of analyzing the mutual interaction between a solid and the surrounding two-phase medium rises in several physical problems, many of them related to marine engineering
In this work we present a numerical framework to carry-out numerical simulations of fluid-structure interaction phenomena in free-surface flows
The framework employs a singlephase method to solve momentum equations and interface advection without solving the gas phase, an immersed boundary method (IBM) to represent the moving solid within the fluid matrix and a fluid structure interaction (FSI) algorithm to couple liquid and solid phases
Summary
The necessity of analyzing the mutual interaction between a solid and the surrounding two-phase medium rises in several physical problems, many of them related to marine engineering. Fluids and Body motion are coupled by means of a semi-explicit coupling In this short paper we propose a validation case, consisting in the free-decay analysis of the single point absorber studied by Devolder et al [4]. The solid presence within the flow is represented by means of a second-order direct forcing Immersed Boundary Method (IBM), described in detail by [1] and already introduced in free-surface simulations in [2]. I expresses the rotational inertia of the object, Cθ is the rotational damping coefficient, Mb are momentum torques due to the body mass and Mf are the torques due to pressure and viscous forces of the surrounding fluid. A particular treatment of the pressure at the solid-fluid interface is employed in order to exactly conserve the mass of the different phases
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