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| Titel |
Inertial waves and wave attractors in a rotating annulus with inner or outer cylinder libration |
| VerfasserIn |
Torsten Seelig, Ion D. Borcia, Marten Klein, Abozar Ghasemi, Andreas Will, Christoph Egbers, Eberhard Schaller, Uwe Harlander |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250078767
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| Zusammenfassung |
| Inertial waves exist in rotating flows and are an ubiquitous phenomena in geophysical and
astrophysical flows. Excitation mechanisms of inertial waves and wave attractors are the
subject of recent publications [1, 2, 3].
Our research is focussed on the experimental and numerical study of inertial waves occuring
in a homogeneous liquid confined between two coaxial co-rotating cylinders. The inner one
has an inclined wall (frustum), in order to focus wave-energy [2]. Both cylinders rotate with
mean angular velocity Ω. Inertial waves are excited due to superimposed periodic oscillations
with frequencies 0 -¤ Ï -¤ 2Ω of (i) the inner or (ii) the outer cylinder together with the upper
and lower lid of the cavity.
The first results exhibit an agreement of wave reflection and attractor geometries between
theory [2], numerical simulations and measurements. Further, we present similarities and
differences between the cases of inner and outer cylinder libration.
[1] Boisson, J., Lamriben, C., Maas, L.R.M., Cortet, P.P., Moisy, F.: Inertial waves and
modes excited by the libration of a rotating cube. Physics of Fluids 24(076602), 1–18
(2012)
[2] Borcia, I.D., Harlander, U.: Inertial waves in a rotating annulus with inclined
inner cylinder: comparing the spectrum of wave attractor frequency bands and the
eigenspectrum in the limit of zero inclination. Theor. Comput. Fluid Dyn. (2012). DOI
10.1007/s00162-012-0278-6
[3] Lopez, J.M., Marques, F.: Instabilities and inertial waves generated in a librating
cylinder. Journal of Fluid Mechanics 687, 171–193. DOI 10.1017/jfm.2011.378 |
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