Fluid Mechanics and Acoustics Laboratory - UMR 5509

LMFA - UMR 5509
Laboratoire de Mécanique des Fluides et d’Acoustique

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Flexible canopies under flow

A bidimensional canopy under flow is investigated experimentally.

Reconfiguration is the large flexural deformation of flexible blades inside the canopy that occurs when it is submitted to a water flow.

For a continuous flow with water height equal to that of the canopy, a static régime is observed. According to measurements, the flexible blades inside the canopy exhibit reconfiguration similarly to isolated blades, provided an adequate value of drag coefficient is taken into account.

When the canopy endures an oscillating flow, the flexible blades behave as an isolated elastic oscillator with viscous damping, added mass and Froude Krylov effects.

For a continuous flow with water height larger than the canopy height, blade oscillations appear. For given conditions, a propagating wave regime with well defined frequency is observed and recall the monami regime described in the literature.