ZURUECK HOCH VOR INHALT SUCHEN

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Proposing Institution

Barcelona Supercomputing Center
Project Manager

Dr. Oriol Lehmkuhl
Jordi Girona,29
08034 Barcelona
Abstract
Geophysical flows from wind to oceanic currents represent a clean source of energy widely available. Structures based on vortex-induced vibrations are one of the mechanisms for harvesting part of this energy in the range of frequencies where flow-induced vibrations originates a strong coupling between the oscillating body and the fluctuating wake. In the present project high fidelity simulations of a cylindrical body oscillating in a free-stream from sub-critical to super-critical Reynolds numbers will be carried out for first time by means of wall-resolved LES. The project aims at shedding light in the interactions of the cylinder with the fluid and specially with the boundary layer, but also the characterisation of the wake topology. The project focus on study the influence of the Reynolds number and the rangeof frequencies in which vortex induced vibrations reinforce the aerodynamic forces on the cylinder. In addition to this, for the cases corresponding to the critical and supercritical Reynolds numbers were the wake width is reduced as a consequence of the instabilities in the boundary layer, localised roughness or a trip wire is added to the cylinder surface in the location where boundary layer is forced to separate from the cylinder so as to passively control flow separation and transition to turbulence to widen the wake. The main idea behind the use of these passive devices is to maximise the ratio of the amplitude of oscillations to the cylinder diameter (A/D). This is the first time this kind of simulations are performed at this level of modelisation, being a step forward in the understanding of the physics of fluid-structure interaction in the range of industrial applications.

Impressum, Conny Wendler