[en] The kinematics of oscillating bluff bodies in a fluid flow have been a hot research topic for decades. Most important are the potentially harmful vortex-induced vibrations (VIVs) where the structure is excited by alternating vortex shedding in its wake. Classical examples are the vibration of chimney stacks exposed to wind, pipelines on the sea-bed excited by the ocean currents or water tubes in heat exchangers.
For these kind of fluid-structure interactions, typically an analytical solution cannot be found. Yet accurate predictions of the kinematics and the resulting dynamics are vital during for instance a design process, in monitoring applications or for control. Obtaining predictions with high fidelity have so far been restricted
to solving the Navier-Stokes equations via computation fluid dynamic (CFD) simulations or to performing experiments. Both approaches are cumbersome and, in the case of CFD, requires a lot of computing power. These drawbacks make the current methods disadvantageous towards many intended applications where only limited time and resources are available to assess a certain risk. What is needed is an efficient and powerful model, flexible enough to span a wide domain in parameter space with a single set of coefficients. A task for which, we believe, system identifi cation can be a very powerful tool.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Decuyper, Jan; Vrije Universiteit Brussel - VUB
Noël, Jean-Philippe ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
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