期刊
JOURNAL OF FLUID MECHANICS
卷 841, 期 -, 页码 380-407出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2018.10
关键词
baroclinic flows; geophysical and geological flows; internal waves
资金
- DAAD, Germany [55908227, PHC 28369XH]
- Ministere des Affaires Etrangeres, France [55908227, PHC 28369XH]
- DFG [HA 2932/8-1]
- Hungarian National Research, Development and Innovation Office (NKFIH) [FK125024]
We report on small-scale instabilities in a thermally driven rotating annulus filled with a liquid with moderate Prandtl number. The study is based on direct numerical simulations and an accompanying laboratory experiment. The computations are performed independently with two different flow solvers, that is, first, the non-oscillatory forward-in-time differencing flow solver EULAG and, second, a higher-order finite-difference compact scheme (HOC). Both branches consistently show the occurrence of small-scale patterns at both vertical sidewalls in the Stewartson layers of the annulus. Small-scale flow structures are known to exist at the inner sidewall. In contrast, short-period waves at the outer sidewall have not yet been reported. The physical mechanisms that possibly trigger these patterns are discussed. We also debate whether these small-scale structures are a gravity wave signal.
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