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| Titel |
Internal-wave radiation by a horizontally oscillating body in a uniformly stratified fluid |
| VerfasserIn |
E. Ermanyuk, J.-B. Flór, B. Voisin |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250028191
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| Zusammenfassung |
| In this experimental-theoretical study we consider the waves emitted by a horizontally
oscillating sphere in a linearly stratified fluid. In contrast to former investigations, the thus
generated wave pattern is a-symmetric and three-dimensional. We consider large
and small amplitude horizontal oscillations for different size spheres. The spatial
structure of internal waves has a non-trivial dependence on the body geometry,
direction and frequency of oscillations. The flowfield is measured quantitatively,
using an alternative version of the synthetic schlieren technique. In addition we
exploit the technique to visualise internal waves with fluorescein dye planes used by
Hopfinger et al (Exp. in Fluids, 11, 1991) to measure the displacement field of the
internal waves. For the theory a uniformly stratified viscous Boussinesq fluid of
infinite extent is considered, with small viscosity and the boundary layer on the
body surface neglected. For small amplitude oscillations, the comparison with the
theory is good, with the near- field theory being in very good agreement with the
experimental results and the far field theory slightly overestimating the wave amplitude. |
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