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Instabilities and small-scale waves within the Stewartson layers of a thermally driven rotating annulus

Published online by Cambridge University Press:  21 February 2018

Thomas von Larcher*
Affiliation:
Institute of Mathematics, Freie Universität Berlin, Arnimallee 9, D-14195 Berlin, Germany
Stéphane Viazzo
Affiliation:
Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, Marseille, France
Uwe Harlander
Affiliation:
Department of Aerodynamics and Fluid Mechanics, Brandenburg University of Technology Cottbus-Senftenberg, Siemens-Halske-Ring 14, D-03046 Cottbus, Germany
Miklos Vincze
Affiliation:
MTA-ELTE Theoretical Physics Research Group, Budapest, H-1117, Hungary
Anthony Randriamampianina
Affiliation:
Aix Marseille Univ, CNRS, Centrale Marseille, M2P2, Marseille, France
*
Email address for correspondence: larcher@math.fu-berlin.de

Abstract

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.

Type
JFM Papers
Copyright
© 2018 Cambridge University Press 

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von Larcher et al. supplementary movie 1

Thermally driven rotating annulus: time sequence of the Q-criterion (isosurface $Q=10^(-4) s^(-2)$) displayed in the unfolded cylinder. Orientation view in the ($\Phi,z$)-plane and viewpoint from the inner sidewall. The time period of the animation in physical units 106s (corresponding nearly to a quarter of the drift period).

Download von Larcher et al. supplementary movie 1(Video)
Video 7.5 MB

von Larcher et al. supplementary movie 2

Thermally driven rotating annulus: time sequence of the Q-criterion (isosurface $Q=10^(-4) s^(-2)$) displayed in the unfolded cylinder. Orientation view in the ($\Phi,z$)-plane and viewpoint from the outer sidewall. The time period of the animation in physical units 106s (corresponding nearly to a quarter of the drift period).

Download von Larcher et al. supplementary movie 2(Video)
Video 7.6 MB

von Larcher et al. supplementary movie 3

Tracks of particles in the thermally driven rotating annulus: 4 millions of particles released in a ($\phi,r$) plane located at the top of the cavity (in the Ekman boundary layer). Particles are colored by the local temperature. The particles are tracked during 266.5s (the drift period is equal to 380s).

Download von Larcher et al. supplementary movie 3(Video)
Video 11.2 MB

von Larcher et al. supplementary movie 4

Tracks of particles in the thermally driven rotating annulus: 4 millions of particles released in a ($\phi,z$) plane inside the Stewartson inner sidewall boundary layer (at radius $r=45.15 mm$). Particles are colored by the local temperature. The particles are tracked during 266.5s (the drift period is equal to 380s).

Download von Larcher et al. supplementary movie 4(Video)
Video 14.9 MB