Internal wave attractors examined using laboratory experiments and 3D numerical simulations

Christophe Brouzet (1) , Ilias Sibgatullin (1, 2, 3) , H Scolan (1, 4) , E. V. Ermanyuk (1, 5) , Thierry Dauxois (1)

1 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
2 Institute of Mechanics
3 Institute for System Programming
4 AOPP - Department of Atmospheric, Oceanic and Planetary Physics [Oxford]
5 LIH - Lavrentyev Institute of Hydrodynamics

In the present paper, we combine numerical and experimental approaches to study the dynamics of stable and unstable internal wave attractors. The problem is considered in a classic trapezoidal setup filled with a uniformly stratified fluid. Energy is injected into the system at global scale by the small-amplitude motion of a vertical wall. Wave motion in the test tank is measured with the help of conventional synthetic schlieren and PIV techniques. The numerical setup closely reproduces the experimental one in terms of geometry and the operational range of the Reynolds and Schmidt numbers. The spectral element method is used as a numerical tool to simulate the nonlinear dynamics of a viscous salt-stratified fluid. We show that the results of three-dimensional calculations are in excellent qualitative and quantitative agreement with the experimental data, including the spatial and temporal parameters of the secondary waves produced by triadic resonance instability. Further, we explore experimentally and numerically the effect of lateral walls on secondary currents and spanwise distribution of velocity amplitudes in the wave beams. Finally, we test the assumption of a bidimensional flow and estimate the error made in synthetic schlieren measurements due to this assumption.

Domaines: Mécanique des fluides [physics.class-ph]

Christophe Brouzet, Ilias Sibgatullin, H Scolan, E. V. Ermanyuk, Thierry Dauxois. Internal wave attractors examined using laboratory experiments and 3D numerical simulations. Journal of Fluid Mechanics, 2016, 793, pp.109-131. ⟨hal-01276713⟩