Repository: Freie Universität Berlin, Math Department

PIV- and LDV-measurements of baroclinic wave interactions in a thermally driven rotating annulus

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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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)
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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