TY - CHAP A1 - Harlander, Uwe A1 - Hoff, Michael A1 - Seelig, Torsten A1 - Egbers, Christoph T1 - Empirical singular vectors of baroclinic flows deduced from experimental data T2 - European Geosciences Union (EGU), 10th General Assembly, Vienna, Austria, 07 – 12 April 2013 Y1 - 2013 UR - http://meetingorganizer.copernicus.org/EGU2013/EGU2013-5330.pdf N1 - EGU2013-5330 ER - TY - CHAP A1 - Koch, Sandy A1 - Harlander, Uwe A1 - Hollerbach, Rainer A1 - Egbers, Christoph T1 - Inertial waves in a spherical shell induced by librations of the inner sphere: experimental and numerical results T2 - European Geosciences Union (EGU), 10th General Assembly, Vienna, Austria, 07 – 12 April 2013 Y1 - 2013 UR - http://meetingorganizer.copernicus.org/EGU2013/EGU2013-4637.pdf N1 - EGU2013-4637 ER - TY - CHAP A1 - Seelig, Torsten A1 - Borcia, Ion-Dan A1 - Klein, Marten A1 - Ghasemi, Abouzar A1 - Will, Andreas A1 - Egbers, Christoph A1 - Schaller, Eberhard A1 - Harlander, Uwe T1 - Inertial waves and wave attractors in a rotating annulus with inner or outer cylinder libration T2 - European Geosciences Union (EGU), 10th General Assembly, Vienna, Austria, 07 – 12 April 2013 Y1 - 2013 UR - http://meetingorganizer.copernicus.org/EGU2013/EGU2013-7602.pdf N1 - EGU2013-7602 ER - TY - CHAP A1 - Vincze, Miklos A1 - Harlander, Uwe A1 - Larcher, Thomas von A1 - Egbers, Christoph T1 - An experimental study of baroclinic wave transitions in a differentially heated rotating annulus with sloping bottom topography T2 - European Turbulence Conference 14 (ETC), 1-4 September 2013, ENS Lyon, France Y1 - 2013 UR - http://etc14.ens-lyon.fr/etc-14-proceedings/accepted-talks/ ER - TY - GEN A1 - Koch, Sandy A1 - Harlander, Uwe A1 - Egbers, Christoph A1 - Hollerbach, Rainer T1 - Inertial waves in a spherical shell induced by librations of the inner sphere: experimental and numerical results T2 - Fluid Dynamics Research Y1 - 2013 U6 - https://doi.org/10.1088/0169-5983/45/3/035504 SN - 0169-5983 VL - 45 IS - 3 SP - 035504 ER - TY - GEN A1 - Borcia, Ion-Dan A1 - Harlander, Uwe T1 - Inertial waves in a rotating annulus with inclined inner cylinder: comparing the spectrum of wave attractor frequency bands and the eigenspectrum in the limit of zero inclination T2 - Theoretical and Computational Fluid Dynamics Y1 - 2013 U6 - https://doi.org/10.1007/s00162-012-0278-6 SN - 1432-2250 VL - 27 IS - 3-4 SP - 397 EP - 413 ER - TY - CHAP A1 - Vincze, Miklos A1 - Harlander, Uwe A1 - Egbers, Christoph T1 - An experimental study on the co-existence of topographic waves and baroclinic instability in a differentially heated rotating annulus T2 - 18. International Coyette-Taylor Workshop, University of Twente, Enschede The Netherlands, 24. - 26. june 2013 Y1 - 2013 SP - S. 67 CY - Enschede ER - TY - GEN A1 - Vincze, Miklos A1 - Harlander, Uwe A1 - Larcher, Thomas von A1 - Egbers, Christoph T1 - An experimental study of regime transitions in a differentially heated baroclinic annulus with flat and sloping bottom topographies T2 - Nonlinear Processes in Geophysics Y1 - 2014 U6 - https://doi.org/10.5194/npg-21-237-2014 SN - 1607-7946 VL - 21 IS - 1 SP - 237 EP - 250 ER - TY - GEN A1 - Klein, Marten A1 - Seelig, Torsten A1 - Kurgansky, Michael V. A1 - Ghasemi, Abouzar A1 - Borcia, Ion-Dan A1 - Will, Andreas A1 - Schaller, Eberhard A1 - Egbers, Christoph A1 - Harlander, Uwe T1 - Inertial wave excitation and focusing in a liquid bounded by a frustum and a cylinder T2 - Journal of Fluid Mechanics N2 - The mechanism of localized inertial wave excitation and its efficiency is investigated for an annular cavity rotating with Ω0 . Meridional symmetry is broken by replacing the inner cylinder with a truncated cone (frustum). Waves are excited by individual longitudinal libration of the walls. The geometry is non-separable and exhibits wave focusing and wave attractors. We investigated laboratory and numerical results for the Ekman number E ≈ 10−6. inclination α = 5.71◦ and libration amplitudes ε 0.2 within the inertial wave band 0 < ω < 2Ω0 . Under the assumption that the inertial waves do not essentially affect the boundary-layer structure, we use classical boundary-layer analysis to study oscillating Ekman layers over a librating wall that is at an angle α = 0 to the axis of rotation. The Ekman layer erupts at frequency ω = f∗, where f∗ ≡ 2Ω0 sin α is the effective Coriolis parameter in a plane tangential to the wall. For the selected inclination this eruption occurs for the forcing frequency ω/Ω0 = 0.2. For the librating lids eruption occurs at ω/Ω0 = 2. The study reveals that the frequency dependence of the total kinetic energy Kω of the excited wave field is strongly connected to the square of the Ekman pumping velocity wE (ω) that, in the linear limit, becomes singular when the boundary layer erupts. This explains the frequency dependence of non-resonantly excited waves. By the localization of the forcing, the two configurations investigated, (i) frustum libration and (ii) lids together with outer cylinder in libration, can be clearly distinguished by their response spectra. Good agreement was found for the spatial structure of low-order wave attractors and periodic orbits (both characterized by a small number of reflections) in the frequency windows predicted by geometric ray tracing. For ‘resonant’ frequencies a significantly increased total bulk energy was found, while the energy in the boundary layer remained nearly constant. Inertial wave energy enters the bulk flow via corner beams, which are parallel to the characteristics of the underlying Poincaré problem. Numerical simulations revealed a mismatch between the wall-parallel mass fluxes near the corners. This leads to boundary-layer eruption and the generation of inertial waves in the corners. KW - boundary-layer structure KW - geophysical and geological flows KW - waves in rotating fluids Y1 - 2014 U6 - https://doi.org/10.1017/jfm.2014.304 SN - 1750-6859 IS - vol. 751 SP - 255 EP - 297 ER - TY - GEN A1 - Hoff, Michael A1 - Harlander, Uwe A1 - Egbers, Christoph T1 - Empirical singular vectors of baroclinic flows deduced from experimental data of a differentially heated rotating annulus T2 - Meteorologische Zeitschrift Y1 - 2015 U6 - https://doi.org/10.1127/metz/2014/0563 VL - 23 IS - 6 SP - 581 EP - 597 ER - TY - CHAP A1 - Harlander, Uwe A1 - Larcher, Thomas von A1 - Wright, G. B. A1 - Hoff, Michael A1 - Alexandrov, Kiril A1 - Egbers, Christoph ED - Larcher, Thomas von ED - Williams, Paul D. T1 - Orthogonal decomposition methods to analyze PIV, LDV and thermography data of a thermally driven rotating annulus laboratory experiment T2 - Modeling Atmospheric and Oceanic Flows: Insights from Laboratory Experiments and Numerical Simulations Y1 - 2014 SN - 978-1-118-85593-5 SN - 978-1-118-85590-4 U6 - https://doi.org/10.1002/9781118856024 SP - 315 EP - 336 PB - Wiley CY - Hoboken ER - TY - GEN A1 - Vincze, Miklos A1 - Borchert, Sebastian A1 - Achatz, Ulrich A1 - Larcher, Thomas von A1 - Baumann, Martin A1 - Liersch, Claudia A1 - Remmler, Sebastian A1 - Beck, Teresa A1 - Alexandrov, Kiril A1 - Egbers, Christoph A1 - Fröhlich, Jochen A1 - Heuveline, Vincent A1 - Hickel, Stefan A1 - Harlander, Uwe T1 - Benchmarking in a rotating annulus: a comparative experimental and numerical study of baroclinic wave dynamics T2 - Meteorologische Zeitschrift Y1 - 2015 U6 - https://doi.org/10.1127/metz/2014/0600 SN - 1610-1227 SN - 0941-2948 VL - 23 IS - 6 SP - 611 EP - 635 ER - TY - GEN A1 - Seelig, Torsten A1 - Kielczewski, Kamil A1 - Tuliszka-Sznitko, Ewa M. A1 - Harlander, Uwe A1 - Egbers, Christoph A1 - Bontoux, Patrick T1 - Taylor-Couette flow with asymmetric end-walls boundary conditions T2 - 15th European turbulence conference (ETC), Delft, The Netherlands (2015) Y1 - 2015 UR - http://www.etc15.nl/proceedings/proceedings/documents/132.pdf ER - TY - CHAP A1 - Klein, Marten A1 - Ghasemi, Abouzar A1 - Seelig, Torsten A1 - Borcia, Ion-Dan A1 - Harlander, Uwe A1 - Will, Andreas T1 - DNS of inertial wave attractors in a librating annulus with height-dependent gap width T2 - 15th European turbulence conference (ETC), Delft, The Netherlands (2015) N2 - Direct numerical simulations (DNS) of inertial wave attractors have been carried out in a librating Taylor-Couette system with broken mirror symmetry in the radial-axial cross-section. The inertial wave excitation mechanism and its localisation at the edges was clarified by applying boundary layer theory. Additional resonance peaks in the simulated response spectra were found to agree with low-order wave attractors obtained by geometric ray tracing. Numerics and theory are in qualitative agreement with recent lab experiments. KW - direct numerical simulations KW - geophysical and astrophysical turbulence KW - waves in rotating fluids Y1 - 2015 UR - http://www.etc15.nl/proceedings/proceedings/documents/134.pdf ER - TY - CHAP A1 - Seelig, Torsten A1 - Ghasemi, Abouzar A1 - Kurgansky, Michael V. A1 - Klein, Marten A1 - Will, Andreas A1 - Harlander, Uwe T1 - Mean flow generation due to longitudinal librations of sidewalls of a rotating annulus T2 - 15th European turbulence conference (ETC), Delft, The Netherlands (2015) Y1 - 2015 UR - http://www.etc15.nl/proceedings/proceedings/documents/175.pdf ER -