A novel internal waves generator
We present a new kind of generator of internal waves which has been designed for three purposes. First, the oscillating boundary conditions force the fluid particles to travel in the preferred direction of the wave ray, hence reducing the mixing due to forcing. Second, only one ray tube is produced so that all of the energy is in the beam of interest. Third, temporal and spatial frequency studies emphasize the high quality for temporal and spatial monochromaticity of the emitted beam. The greatest strength of this technique is therefore the ability to produce a large monochromatic and unidirectional beam.
KeywordsParticle Image Velocimetry Internal Wave Internal Gravity Wave Stratify Fluid Monochromatic Plane Wave
We warmly thank J. Sommeria for helpful discussions and S. Viboud for help during the experiments. Figure 1f was obtained by D. Benielli and J. Sommeria. Comments to the manuscript by Denis Martinand are deeply appreciated. This work has been partially supported by 2005-ANR Project TOPOGI-3D and by the 2006-PATOM CNRS program.
- Benielli D (1995) Excitation paramétrique et déferlement d’ondes internes en fluide stratifié, PhD Thesis, ENS LyonGoogle Scholar
- Görtler H (1943) Uber eine schwingungserscheinung in flussigkeiten mit stabiler dichteschichtung. Zeitschrift angewandte Mathematik Mechanik 23:165Google Scholar
- Gostiaux L, Dauxois T (2006) Internal tides in laboratory experiments. Phys Fluids (Submitted)Google Scholar
- Thorpe SA (2005) The turbulent ocean. Cambridge University Press, CambridgeGoogle Scholar