Harlander, U. and von Larcher, T. and Wang, Y. and Egbers, C.
(2009)
*PIV- and LDV-measurements of baroclinic wave interactions in a thermally driven rotating annulus.*
In: EULAG workshop, October 7, 2008, Bad Tölz.

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## Abstract

We present results of experiments in a rotating, baroclinic annulus of fluid. The apparatus is a differentially heated cylindrical gap with a flat bottom topography and a free surface, rotated around its vertical axis of symmetry, cooled from within, and filled with de-ionised water as working fluid. We used multivariate statistical techniques to understand better the variability of the heated rotating flow $(a)$ in the transition region between regular waves of different zonal wave number, and $(b)$ in the transition region to the quasi-chaotic regime. The former regime is studied by applying the Complex Empirical Orthogonal Function (CEOF) method to Particle-Image-Velocimetry (PIV) data, the latter by applying the Multi-Channel Singular Spectrum Analysis (M-SSA) to Laser-Doppler-Velocimetry (LDV) data. In the annulus, interactions between the dominant mode and so called weaker modes can lead to low-frequency amplitude and wave structure vacillations. Our results complement previous observations recovered primarily by thermocouple arrangements.

Item Type: | Conference or Workshop Item (Paper) |
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Additional Information: | Vortrag |

Subjects: | Mathematical and Computer Sciences > Mathematics > Applied Mathematics |

Divisions: | Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group |

ID Code: | 700 |

Deposited By: | Ulrike Eickers |

Deposited On: | 10 Aug 2009 10:38 |

Last Modified: | 22 Sep 2011 13:55 |

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