Impulsive Flow

Conf’luence Jerry Westerweel

Professeur Delft University of Technology

Vendredi 13 mars à 10h30 • Amphithéâtre Nougaro

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In fluid mechanics we generally look at the flow around moving objects and consider forces, like drag and lift, that act on the object. But what happens when to bring an object in motion that was originally at rest? During the acceleration of an object we also have to put energy in the fluid surrounding the object; this requires an additional force, called the ‘added mass force’. The classical approach, based on potential flow theory, only applies to ideal flows. We investigate the scaling of the drag force during acceleration for a flat plate in a real fluid, and show that the behaviour is quite different. The results are relevant for all kinds of applications, from ship manoeuvring, vehicle aerodynamics, drones and wind turbines in gusts, insect flight, and in sports like rowing and swimming.