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| Titel |
Small-scale flow patterns at the vertical sidewalls of the thermally driven rotating annulus |
| VerfasserIn |
Thomas von Larcher, Stephane Viazzo, Anthony Randriamampianina, Uwe Harlander |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140899
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| Publikation (Nr.) |
 EGU/EGU2017-4351.pdf |
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| Zusammenfassung |
| We report on small-scale instabilities in the thermally driven rotating annulus filled with a
liquid of moderate Prandtl number. Our study is based on numerical computations and
accompanying laboratory experiments. The computations were performed independently
with two different flow solvers, that is the finite volume flow solver EULAG and a higher
order finite difference compact scheme (HOC). We found small-scale flow patterns at
both vertical sidewalls of the annulus, the cooled inner sidewall and the heated
outer one. Obviously, these small-scale instabilities are localized and connected
to the large-scale baroclinic wave field. While the existence of small-scale flow
structures at the inner sidewall is already described in recent publications, e.g., [1],
[2], the occurrence of short wavelength waves at the outer sidewall has not been
reported yet. Here, we focus on characterising the dynamics of the small-scale patterns
at the outer sidewall. Physical mechanisms that might trigger these patterns are
discussed.
References:
[1] Jacoby, T.N.L., Read, P.L., Williams, P.D. & Young, R.M.B., 2011, Generation of
inertia-gravity waves in the rotating, thermal annulus by a localised boundary layer
instability. Geophys. Astrophys. Fluid Dyn., 105, 161-181.
[2] Randriamampianina, A. & Crespo del Arco, E., 2015, Inertia-gravity waves in a
liquid-filled, differentially heated, rotating annulus. J. Fluid Mech., 782, 144-177. |
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