Programme pour le thème C3 mardi après midi salle J

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13H40 : n° 1306 Intermittent spatial structure of Turbulence

Julian Hunt
Centre for Polar Observation & Modelling
The study of turbulence structure, which was greatly stimulated by the leadership and experimental innovations of Alexandre Favre and his collaborators at Marseille, has had the ambitious aim of understanding simultaneously both its statistical properties and its spatial and temporal structure. New concepts of eddy dynamics and kinematics in turbulence have emerged from the very high Reynolds number simulations of Kaneda and detailed experimental and theoretical studies (JH,Westerweel, Eames).

14H20 : n° 644 Wave turbulence in shallow water

Efim Pelinovsky Ira Didenkulova Ana Sergeeva
Institute of Applied Physics
Nonlinear random wave interaction in shallow water is studied. To compare with deep water, the dispersion in shallow water is weak and the correlation between spectral components is strong. It leads to soliton formation in random wave field. The wave random dynamics within KdV equation is analyzed numerically. The soliton propagation in random media is studied analytically. The transformation of the distribution function in the process of the wave runup on a beach is investigated.

14H40 : n° 1351 Effects of airflow on hydrodynamic modulation of short surface waves by long waves

Paul Gang Chen
Laboratoire de Mécanique, Modélisation et Procédés Propres
A model is developed for the effects of airflow on hydrodynamic modulation of short surface gravity waves by a dominant long wave. The propagation of the short wave and distribution of its wavenumber and energy density with respect to phase of the long wave are specified by the kinematic conservation equation and the wind-forcing modified wave action equation, which are solved using linear ray theory and modelled by the Reynolds-averaged Navier-Stokes equations.

15H00 : n° 1286 Law of spreading of the crest of a breaking wave

Patrice Le Gal Michael Le Bars Yves Pomeau Timothée Nicolas Timothée Jamin
IRPHE, CNRS - Aix-Marseille Université - ECM
Wave breaking can be seen as the manifestation of a singularity in the dynamics of the fluid surface. We show theoretically and experimentally that, for shallow water waves, their crests expand in the span-wise direction as the square root of time. We then explore another configuration where the focusing of the initially parabolic waves induces a widening of the breaking proportional to the power 3/2 of time as it follows the Huygens cusp shape.