Experimental surface waves : turbulence, shock waves and interaction with a hydrofoil
| Quand ? |
Le 12/03/2026, de 11:00 à 12:00 |
|---|---|
| Où ? | MGN1 107 |
| Participants |
Guillaume Ricard |
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Wave dynamics at the surface of the ocean are a key phenomenon to understand the exchanges between the ocean and the atmosphere. However, many wave phenomena are still far from being fully understood. For example, wave turbulence, which emerges when many weakly nonlinear waves interact with each other, lacks of experimental validity. In this context, an experiment is set up in a 15 centimeters long canal to evidence the existence of one-dimensional wave turbulence on the surface of a fluid. As weak turbulence assumes wave dispersivity, it is then significant to know whether nondispersive waves can redistribute its energy across scales, or whether it focuses into coherent structures. In the one-dimensional experiment, I will show that waves on the surface of a magnetic liquid become nondispersive in presence of a magnetic field, leading to the emergence of shock waves that drive the system dynamics. The intermittent nature of the experimental shock wave regime is then evidenced, in agreement with a Burgers model modified to take account of the finite steepness of the waves. Then, in a last part, I will focus on the flow implied by gravity waves and on their impact on an immersed hydrofoil. This experiment, performed in the 142 meters long water tank, offers insights regarding wave-structure interactions with the goal of harvesting energy from tidal currents close to the surface where surface waves appear.