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Home page > Séminaires > Archives séminaires > Séminaires 2016 > Séminaire MSC. Lundi 14 mars 2016. Sophie Ramananarivo. (UC San Diego) :"Fluid/structure interaction in flapping locomotion " .

Séminaire MSC. Lundi 14 mars 2016. Sophie Ramananarivo. (UC San Diego) :"Fluid/structure interaction in flapping locomotion "

Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.


Fluid/structure interaction in flapping locomotion

Sophie Ramananarivo University of California, San Diego

Animal locomotion is an interesting context to study the interaction between a movable structure and a fluid. Birds and fishes flap their wings (or fins) to impart momentum to the surrounding flow and create a jet that propels them forward.

The flow structures generated, and hence the strength of the jet, are very dependent on the shape of the wing. This implies that propulsive performance can be improved through a careful tuning of the geometry. Here, we investigate the impact of wing shape on propulsion and ask the question : what would a fast-flying wing look like ? Inspired by the natural mechanism of evolution, we address this search for “good shapes” through a combined experimental and numerical process mimicking natural selection.

In a second part, we look at how the behavior of a swimmer is affected by flow perturbations induced by neighbors. Those issues are particularly relevant in the context of fish schools or bird flocks, as little is known on fluid-mediated interaction in such dense assemblies. We address experimentally the case of the ‘smallest school’ by studying the dynamics of two swimmers propelling freely and independently. Although the pair can assume any relative positioning and speed, it is shown to spontaneously form specific stable configurations. Such results open up new perspectives on the emergence of collective motion, as possible representing stable dynamical intrinsic state of systems.


Contact : Équipe séminaires / Seminar team - Published on / Publié le 20 février 2016


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