TY - GEN A1 - Seelig, Torsten A1 - Harlander, Uwe A1 - Faulwetter, Robin A1 - Egbers, Christoph T1 - Irregularity and singular vector growth of the differentially heated rotating annulus flow Y1 - 2011 ER - TY - GEN A1 - Harlander, Uwe A1 - Wang, Yongtai A1 - Alexandrov, Kiril A1 - Seelig, Torsten A1 - Egbers, Christoph T1 - Intercomparison of numerical models simulating rotating annulus flows Y1 - 2011 ER - TY - GEN A1 - Harlander, Uwe A1 - Seelig, Torsten A1 - Faulwetter, Robin T1 - Singular vector growth in different flow regimes of the differentially heated rotating annulus Y1 - 2011 ER - TY - CHAP A1 - Borcia, Ion-Dan A1 - Seelig, Torsten A1 - Harlander, Uwe A1 - Egbers, Christoph T1 - Inertial waves in rotating cylindrical geometry: mean flow interactions and attractors Y1 - 2011 ER - TY - CHAP A1 - Harlander, Uwe A1 - Alexandrov, Kiril A1 - Wang, Yongtai A1 - Seelig, Torsten A1 - Egbers, Christoph T1 - The differentially heated rotating annulus as a laboratory analog of baroclinic instability and the atmospheric circulation Y1 - 2011 ER - TY - CHAP A1 - Seelig, Torsten A1 - Harlander, Uwe A1 - Faulwetter, Robin A1 - Egbers, Christoph T1 - Irregular and singular vector growth in the differentially heated rotating annulus Y1 - 2011 UR - http://www.mpia-hd.mpg.de/Baroclinic2011/T12.php ER - TY - CHAP A1 - Seelig, Torsten A1 - Harlander, Uwe A1 - Faulwetter, Robin A1 - Egbers, Christoph T1 - Irregular and singular vector growth in the differentially heated rotating annulus Y1 - 2011 ER - TY - CHAP A1 - Seelig, Torsten A1 - Harlander, Uwe A1 - Borcia, Ion-Dan A1 - Egbers, Christoph T1 - Zonal mean flow excitation due to inertial waves propagating in the meridional plane T2 - European Geosciences Union (EGU), 9th General Assembly, Vienna, Austria, 22-27 April Y1 - 2012 UR - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-4981-1.pdf N1 - EGU2012-4981-1 ER - TY - CHAP A1 - Borcia, Ion-Dan A1 - Harlander, Uwe A1 - Seelig, Torsten A1 - Egbers, Christoph T1 - Comparing attractor frequency bands with eigen frequencies for a confined rotating fluid T2 - European Geosciences Union (EGU), 9th General Assembly, Vienna, Austria, 22-27 April Y1 - 2012 UR - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-10411.pdf N1 - EGU2012-10411 ER - TY - CHAP A1 - Borcia, Ion-Dan A1 - Harlander, Uwe A1 - Seelig, Torsten A1 - Egbers, Christoph T1 - Comparing the spectrum of wave attractor frequency bands and the eigenspectrum of fluid in a rotating annulus with inclined inner cylinder T2 - Book of abstracts, 9th European Fluid Mechanics Conference (EFMC), 9-13 September, Rome, Italy Y1 - 2012 UR - http://www.efmc9.eu/absbook/index.html ER - TY - CHAP A1 - Seelig, Torsten A1 - Harlander, Uwe A1 - Borcia, Ion-Dan A1 - Scurtu, Nicoleta A1 - Egbers, Christoph A1 - Klein, Marten A1 - Ghasemi, Abouzar A1 - Will, Andreas A1 - Schaller, Eberhard T1 - Inertial waves in rotating cylindrical annulus: theory, experiment and simulations T2 - Book of abstracts, 9th European Fluid Mechanics Conference (EFMC), 9-13 September, Rome, Italy Y1 - 2012 UR - http://www.efmc9.eu/absbook/index.html ER - 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 - 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 - 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 - THES A1 - Seelig, Torsten T1 - Inertial wave propagation, focusing and mean flow excitation : theory and experiments Y1 - 2014 SN - 978-3-95404-793-2 SN - 978-3-7369-4793-1 PB - Cuvillier CY - Göttingen 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 - TY - CHAP A1 - Früh, Wolf-Gerrit A1 - Szabo, Peter A1 - Seelig, Torsten A1 - Hoff, Michael A1 - Egbers, Christoph T1 - Spectral Features of the transition to structural vacillation in the baroclinic annulus T2 - ICTW 19, Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 36 EP - 37 CY - Cottbus ER - TY - GEN A1 - Seelig, Torsten A1 - Harlander, Uwe T1 - Can zonally symmetric inertial waves drive an oscillating zonal mean flow? T2 - Geophysical & Astrophysical Fluid Dynamics Y1 - 2015 U6 - https://doi.org/10.1080/03091929.2015.1094064 SN - 1029-0419 VL - 109 IS - 6 SP - 541 EP - 566 ER -