TY - CHAP A1 - Hoff, Michael A1 - Harlander, Uwe A1 - Jahangir, Saad A1 - Egbers, Christoph T1 - Experimental study of inertial waves in a spherical shell induced by librations of the inner sphere T2 - European Geosciences Union, General Assembly 2015, Vienna, Austria, 13 April - 17 May 2015 Y1 - 2015 UR - http://meetingorganizer.copernicus.org/EGU2015/EGU2015-5650.pdf N1 - EGU2015-5650 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Hoff, Michael A1 - Harlander, Uwe A1 - Egbers, Christoph T1 - Experimental study of the fluid flow in a spherical shell induced by librations of the inner sphere: linear and non-linear features T2 - ICTW 19, Book of Abstractc, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 86 EP - 87 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 - TY - CHAP A1 - Harlander, Uwe A1 - Seelig, Torsten A1 - Gellert, Marcus A1 - Viazzo, Stephane A1 - Randriamampianina, Anthony A1 - Egbers, Christoph A1 - Rüdiger, Günther T1 - Stratorotational instability: nonlinear aspects at higher reynolds numbers T2 - EUROMECH Colloquium 567, Turbulent mixing in stratified flows 22-25 March 2015, DAMTP, Centre for Mathematical Sciences, Cambridge Y1 - 2015 UR - http://567.euromech.org/call-for-abstracts/ ER - TY - CHAP A1 - Harlander, Uwe A1 - Seelig, Torsten A1 - Gellert, Marcus A1 - Viazzo, Stephane A1 - Randriamampianina, Anthony A1 - Egbers, Christoph A1 - Rüdiger, Günther T1 - Stratorotational instability in a thermally stratified taylor-couette flow T2 - European Geosciences Union, General Assembly 2015, Vienna, Austria, 13 April - 17 May 2015 Y1 - 2015 UR - http://meetingorganizer.copernicus.org/EGU2015/EGU2015-3444.pdf N1 - EGU 2015-3444 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Seelig, Torsten A1 - Harlander, Uwe T1 - Can meridionally propagating inertial waves drive an oscillating mean flow? T2 - European Geosciences Union, General Assembly 2015, Vienna, Austria, 13 April - 17 May 2015 Y1 - 2015 UR - http://meetingorganizer.copernicus.org/EGU2015/EGU2015-3823.pdf N1 - EGU2015-3823 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Klein, Marten A1 - Ghasemi, Abouzar A1 - Seelig, Torsten A1 - Borcia, Ion-Dan A1 - Harlander, Uwe A1 - Will, Andreas T1 - Mean flow generation and inertial wave attractors in a librating annulus: DNS and theory T2 - European Geosciences Union, General Assembly 2015, Vienna, Austria, 13 April - 17 May 2015 KW - boundary-layer structure KW - direct numerical simulation KW - instability KW - waves in rotating fluids Y1 - 2015 UR - http://meetingorganizer.copernicus.org/EGU2015/EGU2015-15640-1.pdf N1 - EGU2015-15640-1 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Randriamampianina, Anthony A1 - Harlander, Uwe A1 - Vincze, Miklos A1 - Seelig, Torsten A1 - Larcher, Thomas von A1 - Viazzo, Stephane T1 - Inertia gravity waves linked to baroclinic waves in a rotating, differentially heated annulus with an upper free surface T2 - ICTW 19 Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 38 EP - 39 CY - Cottbus ER - TY - CHAP A1 - Larcher, Thomas von A1 - Harlander, Uwe A1 - Seelig, Torsten A1 - Randriamampianina, Anthony A1 - Viazzo, Stephane A1 - Vincze, Miklos T1 - Multiple scales in the thermally driven rotating annulus: time-series data analysis of experiments and numerics T2 - ICTW 19, Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 40 EP - 41 CY - Cottbus ER - TY - CHAP A1 - Seelig, Torsten A1 - Harlander, Uwe A1 - Kielczewski, Kamil A1 - Tuliszka-Sznitko, Ewa M. A1 - Bontoux, Patrick A1 - Egbers, Christoph T1 - Study of transitional and turbulent flows in rotor/stator cavities T2 - ICTW 19, Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 118 EP - 119 CY - Cottbus 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 annular cavity with a height-dependent gap T2 - ICTW 19, Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany KW - waves in rotating fluids KW - geophysical and geological flows KW - direct numerical simulations Y1 - 2015 SP - 122 EP - 123 CY - Cottbus ER - TY - CHAP A1 - Harlander, Uwe A1 - Seelig, Torsten A1 - Stapelfeld, Ludwig A1 - Gellert, Marcus A1 - Viazzo, Stephane A1 - Randriamampianina, Anthony A1 - Egbers, Christoph A1 - Rüdiger, Günther T1 - Stratorotational Instability: nonlinear aspects at higher Reynolds numbers T2 - ICTW 19, Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 132 EP - 133 CY - Cottbus ER - TY - GEN A1 - Hoff, Michael A1 - Harlander, Uwe A1 - Egbers, Christoph T1 - Experimental survey of linear and nonlinear inertial waves and wave instabilities in a spherical shell T2 - Journal of Fluid Mechanics Y1 - 2016 U6 - https://doi.org/10.1017/jfm.2015.743 SN - 1750-6859 IS - vol. 789 SP - 589 EP - 616 ER - TY - CHAP A1 - Klein, Marten A1 - Borcia, Ion-Dan A1 - Egbers, Christoph A1 - Ghasemi, Abouzar A1 - Harlander, Uwe A1 - Kurgansky, Michael V. A1 - Schaller, Eberhard A1 - Seelig, Torsten A1 - Will, Andreas T1 - Inertial Waves and Wave Excitation Mechanisms in Annular Cavities: Simulations, Experiments and Theory T2 - European Turbulence Conference ETC14, Lyon, 2013 KW - boundary-layer structure KW - geophysical and geological flows KW - waves in rotating fluids Y1 - 2013 UR - http://etc14.ens-lyon.fr/etc-14-proceedings/accepted-talks ER - TY - CHAP A1 - Klein, Marten A1 - Ghasemi, Abouzar A1 - Harlander, Uwe A1 - Will, Andreas T1 - Inertial wave excitation and wave attractors in a librating annulus: DNS T2 - European Geosciences Union, General Assembly 2014, Vienna, Austria, 27 April – 02 May 2014 KW - boundary-layer structure KW - geophysical and geological flows KW - waves in rotating fluids KW - direct numerical simulations Y1 - 2014 N1 - EGU2014-15585 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - GEN A1 - Veen, Roeland C. A. van der A1 - Huisman, Sander G. A1 - Merbold, Sebastian A1 - Harlander, Uwe A1 - Egbers, Christoph A1 - Lohse, Detlef A1 - Sun, Chao T1 - Taylor Couette turbulence at radius ratio =0,5:scaling, flow structures and plumes T2 - Journal of Fluid Mechanics Y1 - 2016 U6 - https://doi.org/10.1017/jfm.2016.352 SN - 1469-7645 SN - 0022-1120 VL - 799 SP - 334 EP - 351 ER - TY - GEN A1 - Hoff, Michael A1 - Harlander, Uwe A1 - Triana, Santiago Andrés T1 - Study of turbulence and interacting inertial modes in a differentially rotating sphericel shell experiment T2 - Physical Review Fluids Y1 - 2016 U6 - https://doi.org/10.1103/PhysRevFluids.1.043701 VL - 1 IS - 4 SP - 043701 ER - TY - CHAP A1 - Seelig, Torsten A1 - Harlander, Uwe T1 - Can zonally symmetric inertial waves drive an oscillating mean flow? T2 - European Geosciences Union, General Assembly 2016, Vienna, Austria Y1 - 2016 UR - http://meetingorganizer.copernicus.org/EGU2016/EGU2016-6847.pdf N1 - EGU2016-6847 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Hoff, Michael A1 - Harlander, Uwe A1 - Egbers, Christoph A1 - Triana, Santiago Andrés T1 - Interacting inertial modes and their instability in a differentially rotating spherical gap flow T2 - Book of abstracts, 31st IUGG Conference on Mathematical Geophysics 6 - 10 June 2016 Paris, France Y1 - 2016 UR - https://cmg2016.sciencesconf.org/ SP - S. 37 ER - TY - CHAP A1 - Seelig, Torsten A1 - Burchardt, Martin A1 - Krebs, Andreas A1 - Harlander, Uwe A1 - Egbers, Christoph T1 - PIV measurements in an axially stratified Taylor-Couette experiment T2 - Book of abstracts, School ISTROF 2016, Instabilities and Turbulence in Strato-Rotational Flows, July 11-13th, 2016, Le Havre Y1 - 2016 UR - https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxzY2hvb2xpc3Ryb2Z8Z3g6NDA3Y2E3ZGQ2OWIwMTdmNQ ER - TY - CHAP A1 - Rodda, Costanza A1 - Borcia, Ion-Dan A1 - Harlander, Uwe T1 - Experimental study of internal wave emission from baroclinic jets T2 - 11th European Fluid Mechanics Conference, Sept. 12-16, 2016, Sevilla, Spain Y1 - 2016 UR - http://www.efmc11.org/download/com/com_0145_C1CLR1.pdf ER - TY - CHAP A1 - Hoff, Michael A1 - Harlander, Uwe A1 - Egbers, Christoph A1 - Triana, Santiago Andrés ED - Egbers, Christoph T1 - Interacting inertial modes in a differentially rotating spherical gap flow experiment T2 - Experimentelle Strömungsmechanik, 24. Fachtagung 6.-8. September 2016 Cottbus Y1 - 2016 SN - 978-3-9816764-2-6 SP - S. 12 PB - German Association for Laser Anemometry GALA e.V. CY - Karlsruhe ER - TY - CHAP A1 - Rodda, Costanza A1 - Borcia, Ion-Dan A1 - Harlander, Uwe T1 - Experimental results on intertia gravity wave emission from baroclinic jets T2 - Book of abstracts, School ISTROF 2016, Instabilities and Turbulence in Strato-Rotational Flows, July 11-13th, 2016, Le Havre Y1 - 2016 UR - https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxzY2hvb2xpc3Ryb2Z8Z3g6NDA3Y2E3ZGQ2OWIwMTdmNQ ER - TY - CHAP A1 - Hoff, Michael A1 - Harlander, Uwe A1 - Triana, Santiago Andrés A1 - Egbers, Christoph T1 - Inertial modes and their transition to turbulence in a differentially rotating spherical gap flow T2 - European Geosciences Union, General Assembly 2016, Vienna, Austria, 17-22. April 2016 Y1 - 2016 UR - http://meetingorganizer.copernicus.org/EGU2016/EGU2016-6990.pdf N1 - EGU2016-6990 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - GEN A1 - Ghasemi, Abouzar A1 - Klein, Marten A1 - Harlander, Uwe A1 - Kurgansky, Michael V. A1 - Schaller, Eberhard A1 - Will, Andreas T1 - Mean flow generation by Görtler vortices in a rotating annulus with librating side walls T2 - Physics of Fluids N2 - Time periodic variation of the rotation rate of an annulus induces in supercritical regime an unstable Stokes boundary layer over the cylinder side walls, generating Görtler vortices in a portion of a libration cycle as a discrete event. Numerical results show that these vortices propagate into the fluid bulk and generate an azimuthal mean flow. Direct numerical simulations of the fluid flow in an annular container with librating outer (inner) cylinder side wall and Reynolds-averaged Navier–Stokes (RANS) equations as diagnostic equations are used to investigate generation mechanism of the retrograde (prograde) azimuthal mean flow in the bulk. First, we explain, phenomenologically, how absolute angular momentum of the bulk flow is mixed and changed due to the propagation of the Görtler vortices, causing a new vortex of basin size. Then we investigate the RANS equations for intermediate time scale of the development of the Görtler vortices and for long time scale of the order of several libration periods. The former exhibits sign selection of the azimuthal mean flow. Investigating the latter, we predict that the azimuthal mean flow is proportional to the libration amplitude squared and to the inverse square root of the Ekman number and libration frequency and then confirms this using the numerical data. Additionally, presence of an upscale cascade of energy is shown, using the kinetic energy budget of fluctuating flow. KW - Direct Numerical Simulation KW - Fluid Mechanics KW - Mean Flow KW - Rotation KW - Cylinder KW - Centrifugal KW - Instability KW - Mechanism KW - Vortex Y1 - 2016 U6 - https://doi.org/10.1063/1.4948406 VL - 28 IS - 056603 SP - 1 EP - 23 ER - TY - GEN A1 - Will, Andreas A1 - Harlander, Uwe A1 - Metz, Werner T1 - Climatological relevance of leading seasonal singular vectors. Part I: Energy, enstrophy and spatio – temporal variability T2 - Meteorologische Zeitschrift N2 - Fast growing atmospheric Rossby wave trains (RWT modes) are solutions of a Singular Vector (SV) analysis of a damped barotropic vorticity equation for northern winter basic flows. Using 40 DJF basic flows RWT modes are found over four regions of the globe only. Their propagation paths are remarkably constant for development times up to 96 h, but spread for longer times. The RWT mode with the largest 4 day growth rate develops over the North-Pacific (NPAC) region for each of the observed DJF basic flows considered. This mode is referred to as NPAC-mode. The eigenvalues, which are the 4 day kinetic energy growth factors of the NPAC mode, range from 10 to 24 for nearly all of the basic flows. In some exceptional years they are close to 30. The NPAC modes with moderate growth factors could be shown to be approximate solutions of the nonlinear model equation. Hereto a new formulation of the advection term provided by the energy-vortex theory was used. It appears that the constancy of propagation paths and the mode's shapes, the large growth factors and the validity of the linearization assumption up to development times of 96h make the NPAC mode a candidate to explain substantial parts of large scale interannual atmospheric variability in the North Pacific region. KW - Meteorology KW - Rossby Waves KW - Extreme Event KW - Teleconnection KW - PNA KW - Enstrophy KW - Energy KW - Energy Vorticity Theory Y1 - 2006 U6 - https://doi.org/10.1127/0941-2948/2006/0145 SN - 1610-1227 VL - 15 IS - 4 SP - 1 EP - 10 ER - TY - GEN A1 - Vincze, Miklós A1 - Borcia, Ion-Dan A1 - Harlander, Uwe T1 - Temperature fluctuations in a changing climate: an ensemble-based experimental approach T2 - Scientific Reports Y1 - 2017 U6 - https://doi.org/10.1038/s41598-017-00319-0 SN - 2045-2322 VL - 7 SP - 254 ER - TY - CHAP A1 - Larcher, Thomas von A1 - Viazzo, Stephane A1 - Randriamampianina, Anthony A1 - Harlander, Uwe T1 - Small-scale flow patterns at the vertical sidewalls of the thermally driven rotating annulus T2 - European Geosciences Union General Assembly 2017 Vienna, Austria, 23–28 April 2017 Y1 - 2017 UR - http://meetingorganizer.copernicus.org/EGU2017/EGU2017-4351.pdf N1 - EGU2017-4351 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Rodda, Costanza A1 - Borcia, Ion-Dan A1 - Harlander, Uwe T1 - Baroclinic wave laboratory experiment with radial heating and vertical stratification to study IGW emission from baroclinic fronts T2 - European Geosciences Union General Assembly 2017 Vienna, Austria, 23–28 April 2017 Y1 - 2017 UR - http://meetingorganizer.copernicus.org/EGU2017/EGU2017-3676.pdf N1 - EGU2017-3676 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Merbold, Sebastian A1 - Harlander, Uwe A1 - Egbers, Christoph T1 - Physics of rotating fluids, a DFG core facility centre T2 - 88th Annual Meeting of the International Association of Applied Mathematics and Mechanics GAMM, March 6-10, 2017, Weimar, Germany, Book of abstracts Y1 - 2017 UR - https://www.tu-ilmenau.de/fileadmin/media/analysis/trunk/170304_BoA_GAMM_2017.pdf SP - S. 355 ER - TY - GEN A1 - Rüdiger, Günther A1 - Seelig, Torsten A1 - Schultz, M. A1 - Gellert, Marcus A1 - Egbers, Christoph A1 - Harlander, Uwe T1 - The stratorotational instability of Taylor-Couette flows with moderate Reynolds numbers T2 - Geophysical & Astrophysical Fluid Dynamics Y1 - 2017 U6 - https://doi.org/10.1080/03091929.2017.1382487 SN - 0309-1929 SN - 1029-0419 VL - 111 IS - 6 SP - 429 EP - 447 ER - TY - CHAP A1 - Maltese Meletti de Oliveira, Gabriel A1 - Raspo, Isabelle A1 - Seelig, Torsten A1 - Viazzo, Stephane A1 - Randriamampianina, Anthony A1 - Abide, Stéphane A1 - Krebs, Andreas A1 - Harlander, Uwe T1 - On the instability of radially sheared and axially stratified vortex flow T2 - European Geosciences Union, General Assembly 2018, Vienna, Austria Y1 - 2018 UR - https://meetingorganizer.copernicus.org/EGU2018/EGU2018-8703.pdf N1 - EGU2018-8703 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Borcia, Ion-Dan A1 - Borcia, Rodica A1 - Bestehorn, Michael A1 - Xu, Wenchao A1 - Harlander, Uwe T1 - Surface waves generated by libration in a circular channel T2 - The 12th European Fluid Mechanics Conference, 9 September 2018 – 13 September 2018, Vienna, Austria Y1 - 2018 UR - http://info.tuwien.ac.at/efmc12/EFMC12_program_v3.2.pdf ER - TY - GEN A1 - Rodda, Costanza A1 - Borcia, Ion-Dan A1 - Le Gal, Patrice A1 - Vincze, Miklos A1 - Harlander, Uwe T1 - Baroclinic, Kelvin and inertia-gravity waves in the barostrat instability experiment T2 - Geophysical & Astrophysical Fluid Dynamics Y1 - 2018 U6 - https://doi.org/10.1080/03091929.2018.1461858 SN - 1029-0419 SN - 0309-1929 VL - 112 IS - 3 SP - 175 EP - 206 ER - TY - GEN A1 - Seelig, Torsten A1 - Gellert, Marcus A1 - Harlander, Uwe T1 - Experimental investigation of stratorotational instability using a thermally stratified system: instability, waves and associated momentum flux T2 - Geophysical & Astrophysical Fluid Dynamics Y1 - 2018 U6 - https://doi.org/10.1080/03091929.2018.1488971 SN - 0309-1929 SN - 1029-0419 VL - 112 IS - 4 SP - 239 EP - 264 ER - TY - CHAP A1 - Rodda, Costanza A1 - Borcia, Ion-Dan A1 - Hien, Steffen A1 - Achatz, Ulrich A1 - Le Gal, Patrice A1 - Harlander, Uwe T1 - Numerical and experimental study of inertia-gravity waves in the differentially heated rotating annulus T2 - European Geosciences Union, General Assembly 2018, Vienna, Austria, 8–13 April 2018 Y1 - 2018 UR - https://meetingorganizer.copernicus.org/EGU2018/EGU2018-7385-1.pdf N1 - EGU2018-7385-1 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - GEN A1 - Harlander, Uwe A1 - Borcia, Ion-Dan A1 - Krebs, Andreas T1 - Nonnormality increases variance of gravity waves trapped in a tilted box T2 - Geophysical & Astrophysical Fluid Dynamics Y1 - 2019 U6 - https://doi.org/10.1080/03091929.2018.1549660 SN - 1029-041 VL - 113 IS - 5/6 SP - 602 EP - 622 ER - TY - GEN A1 - Ghasemi, Abouzar A1 - Klein, Marten A1 - Will, Andreas A1 - Harlander, Uwe T1 - Mean flow generation by an intermittently unstable boundary layer over a sloping wall T2 - Journal of Fluid Mechanics Y1 - 2018 U6 - https://doi.org/10.1017/jfm.2018.552 SN - 1750-6859 IS - vol. 853 SP - 111 EP - 149 ER - TY - GEN A1 - Larcher, Thomas von A1 - Viazzo, Stephane A1 - Harlander, Uwe A1 - Vincze, Miklos T1 - Instabilities and small-scale waves within the Stewartson layers of a thermally driven rotating annulus T2 - Journal of Fluid Mechanics Y1 - 2018 U6 - https://doi.org/10.1017/jfm.2018.10 SN - 1750-6859 IS - vol. 841 SP - 380 EP - 407 ER - TY - GEN A1 - Borcia, Ion-Dan A1 - Borcia, Rodica A1 - Bestehorn, Michael A1 - Richter, Stefan A1 - Xu, Wenchao A1 - Harlander, Uwe T1 - Horizontal Faraday instability and parametric excitation in a circular channel T2 - GAMM 2019, 90th Annual Meeting of the International Assoociation of Applied Mathematics and Mechanics, February 18-22, 2019, Vienna, Austria Y1 - 2018 UR - https://jahrestagung.gamm-ev.de/images/2019/Photos/GAMM2019_BookofAbstracts.pdf SN - 978-3-903024-84-7 SP - 338 PB - TU Verlag CY - Wien ER - TY - GEN A1 - Rodda, Costanza A1 - Hien, Steffen A1 - Achatz, Ulrich A1 - Borcia, Ion-Dan A1 - Le Gal, Patrice A1 - Vincze, Miklos A1 - Harlander, Uwe T1 - Differentially heated rotating annulus experiments to study gravity wave emission from jets and fronts T2 - 17th European Turbulence Conference, ETC 2019, September 3 - 6, 2019, Torino, Italy Y1 - 2019 UR - http://www.symposium.it/files/eventi/84/etc-2019-561.pdf CY - Turin ER - TY - GEN A1 - Harlander, Uwe A1 - Le Gal, Patrice A1 - Borcia, Ion-Dan A1 - Le Dizès, Stéphane A1 - Chen, Jun A1 - Favier, Benjamin T1 - The linear instability of the stratified plane Poiseuille flow T2 - 17th European Turbulence Conference, ETC 2019, September 3 - 6, 2019, Torino, Italy Y1 - 2019 UR - http://www.symposium.it/files/eventi/84/etc-2019-561.pdf CY - Turin ER - TY - GEN A1 - Xu, Wenchao A1 - Harlander, Uwe T1 - Mean flow generation in rotating annulus with stochastic methods T2 - 17th European Turbulence Conference, ETC 2019, September 3 - 6, 2019, Torino, Italy Y1 - 2019 UR - http://www.symposium.it/files/eventi/84/etc-2019-561.pdf CY - Turin ER - TY - GEN A1 - Borcia, Ion-Dan A1 - Borcia, Rodica A1 - Richter, Sebastian A1 - Xu, Wenchao A1 - Bestehorn, Michael A1 - Harlander, Uwe T1 - Horizontal Faraday instability in a circular channel T2 - Proceedings in Applied Mathematics and Mechanics (PAMM) N2 - We study surface waves in a circular channel placed on a rotating table. The tank can rotate with constant velocity and/or can oscillate. For a glycerin‐water‐solution with high viscosity, oscillation amplitudes about 20 cm and frequencies of 0.5 Hz, we observe surface patterns generated by a parametric instability. The circular geometry of the channel assures in a natural way the periodic lateral boundary conditions often used in the numerical simulations. Up to our knowledge this is the first experiment which evidences the horizontal Faraday instability in a container without walls blocking the flow in the oscillation direction. Experimental and numerical results are compared and discussed. KW - Faraday instability KW - Numerical solutions Y1 - 2019 UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/pamm.201900242 U6 - https://doi.org/10.1002/pamm.201900242 SN - 1617-7061 VL - 19 IS - 1 ER - TY - GEN A1 - Borcia, Ion-Dan A1 - Borcia, Rodica A1 - Xu, Wenchao A1 - Bestehorn, Michael A1 - Richter, Sebastian A1 - Harlander, Uwe T1 - Undular bores in a large circular channel T2 - European Journal of Mechanics - B/Fluids N2 - An experimental device previously developed for studying rotating baroclinic flows has been used to investigate undular bores formation, propagation and collision. Up to our knowledge this is the first experimental study of undular bores in a circular channel. For a setup without barriers, this geometry accomplishes in a natural way the periodic lateral boundary conditions, very often used in numerical simulations. An excellent agreement between the experiment and simulation has been achieved. The spatio-temporal structure of bores is well reproduced for the first few reflections or collisions. KW - Undular bores KW - Bore collision KW - Periodical boundary conditions Y1 - 2020 UR - https://www.sciencedirect.com/science/article/pii/S0997754619300706?via%3Dihub U6 - https://doi.org/10.1016/j.euromechflu.2019.09.003 SN - 0997-7546 VL - 79 SP - 67 EP - 73 ER - TY - GEN A1 - Kurgansky, Michael V. A1 - Seelig, Torsten A1 - Klein, Marten A1 - Will, Andreas A1 - Harlander, Uwe T1 - Mean flow generation due to longitudinal librations of sidewalls of a rotating annulus T2 - Geophysical & Astrophysical Fluid Dynamics N2 - Laboratory experiments with a rotating cylindrical annulus arereported that reveal a prograde jet, which is adjacent to a (longitu-dinally) librating inner straight cylindrical wall. Here, wall libration isrealised as a time-harmonic modulation of the inner cylinder’s rota-tion rate. The outer cylindrical wall and bottom and top lids rotatewith constant angular velocity. The main purpose of our study is tocontribute to a qualitative and quantitative understanding of non-linearities that are present in oscillating, but centrifugally stable,vertical boundary layers frequently encountered in rotating wall-bounded flows. We consider a problem that is in a sense comple-mentary to that of previous works that focused on oscillating Ekmanlayers but neglected the vertical Stokes−Stewartson layers. A sim-ple analytical model is proposed that is able to predict the magni-tude and spatial structure of the emerging prograde near-wall jet interms of nonlinearity inherent in the inner cylinder’s boundary layerdynamics. KW - boundary layer structure KW - geophysical and geological flows KW - longitudinal libration Y1 - 2020 U6 - https://doi.org/10.1080/03091929.2019.1692829 SN - 1029-0419 VL - 114 IS - 6 SP - 762 ER - TY - GEN A1 - Xu, Wenchao A1 - Harlander, Uwe T1 - Inertial mode interactions in a rotating tilted cylindrical annulus with free surface T2 - Physical Review Fluids Y1 - 2020 UR - https://journals.aps.org/prfluids/abstract/10.1103/PhysRevFluids.5.094801 U6 - https://doi.org/10.1103/PhysRevFluids.5.094801 SN - 2469-990X VL - 5 IS - 9 ER - TY - GEN A1 - Rodda, Costanza A1 - Harlander, Uwe T1 - Transition from Geostrophic Flows to Inertia–Gravity Waves in the Spectrum of a Differentially Heated Rotating Annulus Experiment T2 - Journal of the Atmospheric Sciences Y1 - 2020 U6 - https://doi.org/10.1175/JAS-D-20-0033.1 SN - 1520-0469 SN - 0022-4928 VL - 77 IS - 8 SP - 2793 EP - 2806 ER - TY - GEN A1 - Harlander, Uwe T1 - Comparison of paradigmatic gravity wave models for ocean and atmosphere T2 - EGU General Assembly 2020, Online | 4–8 May 2020 Y1 - 2020 U6 - https://doi.org/10.5194/egusphere-egu2020-7222 ER - TY - GEN A1 - Vincze, Miklos A1 - Bozóki, Tamás A1 - Herein, Mátyás A1 - Borcia, Ion-Dan A1 - Rodda, Costanza A1 - Pálfy, József A1 - Nyerges, Anita A1 - Harlander, Uwe T1 - Climate impact of the Drake Passage opening: lessons from a minimalistic laboratory experiment T2 - EGU General Assembly 2020, Online | 4–8 May 2020 Y1 - 2020 U6 - https://doi.org/10.5194/egusphere-egu2020-5004 ER - TY - GEN A1 - Früh, Wolf-Gerrit A1 - Szabo, Peter A1 - Egbers, Christoph A1 - Harlander, Uwe T1 - Locating sources of variability in the transition to Structural Vacillation in the baroclinic annulus T2 - EGU General Assembly 2020, Online | 4–8 May 2020 Y1 - 2020 UR - https://ui.adsabs.harvard.edu/abs/2020EGUGA..22.7262F/abstract U6 - https://doi.org/10.5194/egusphere-egu2020-7262 ER - TY - GEN A1 - Harlander, Uwe A1 - Hense, Andreas A1 - Will, Andreas A1 - Kurgansky, Michael V. T1 - New aspects of geophysical fluid dynamics T2 - Meteorologische Zeitschrift Y1 - 2006 U6 - https://doi.org/10.1127/0941-2948/2006/0144 VL - 15 IS - 4 SP - 388 ER - TY - GEN A1 - Rodda, Costanza A1 - Harlander, Uwe A1 - Savaro, C. A1 - Campagne, A. A1 - Calpe Linares, M. A1 - Augier, P. A1 - Sommeria, Joel A1 - Valran, T. A1 - Viboud, Samuel A1 - Mordant, N. T1 - Can Laboratory experiments help to explain the atmosphere and ocean's energetics? T2 - Colaborative Research Center TRR 181, Energy transfers in Atmosphere and Oceans, 16th - 18th Mar. 2021, Universität Hamburg, Center for Earth System Research and Sustainability (CEN) Y1 - 2021 UR - https://www.b-tu.de/fg-aerodynamik-stroemungslehre/publikationen/tagungsbaende ER - TY - GEN A1 - Vincze, Miklos A1 - Bozóki, Tamás A1 - Herein, Mátyás A1 - Borcia, Ion-Dan A1 - Harlander, Uwe A1 - Horicsányi, Attila A1 - Nyerges, Anita A1 - Rodda, Costanza A1 - Pál, András A1 - Pálfy, József T1 - The Drake Passage opening from an experimental fluid dynamics point of view T2 - SScientific Reports Y1 - 2021 U6 - https://doi.org/10.1038/s41598-021-99123-0 SN - 2045-2322 VL - 11 ER - TY - GEN A1 - Maltese Meletti de Oliveira, Gabriel A1 - Abide, Stéphane A1 - Viazzo, Stephane A1 - Krebs, Andreas A1 - Harlander, Uwe T1 - Experiments and long-term high-performance computations on amplitude modulations of strato-rotational flows T2 - Geophysical & Astrophysical Fluid Dynamics Y1 - 2021 U6 - https://doi.org/10.1080/03091929.2020.1795647 SN - 1029-0419 SN - 0309-1929 VL - 115 IS - 3 SP - 297 EP - 321 ER - TY - GEN A1 - Harlander, Uwe A1 - Kurgansky, Michael V. T1 - Two-dimensional internal gravity wave beam instability. Linear theory and subcritical instability T2 - Geophysical & Astrophysical Fluid Dynamics Y1 - 2021 U6 - https://doi.org/10.1080/03091929.2021.1943379 SN - 1029-0419 SN - 0309-1929 ER - TY - GEN A1 - Le Gal, Patrice A1 - Harlander, Uwe A1 - Borcia, Ion-Dan A1 - Le Dizès, Stéphane A1 - Chen, J. A1 - Favier, Benjamin T1 - Instability of vertically stratified horizontal plane Poiseuille flow T2 - Journal of Fluid Mechanics Y1 - 2021 U6 - https://doi.org/10.1017/jfm.2020.917 SN - 1469-7645 SN - 0022-1120 VL - 907 IS - R1 SP - 1 EP - 14 ER - TY - GEN A1 - Harlander, Uwe A1 - Borcia, Ion-Dan A1 - Vincze, Miklos A1 - Rodda, Costanza T1 - Probability Distribution of Extreme Events in a Baroclinic Wave Laboratory Experiment T2 - Fluids N2 - Atmospheric westerly jet streams are driven by temperature differences between low and high latitudes and the rotation of the Earth. Meandering jet streams and propagating Rossby waves are responsible for the variable weather in the mid-latitudes. Moreover, extreme weather events such as heat waves and cold spells are part of the jet stream dynamics. For many years, a simple analog in the form of a simplified laboratory experiment, the differentially heated rotating annulus, has provided insight into the dynamics of the meandering jet stream. In the present study, probability density distributions of extreme events from a long-term laboratory experiment are studied and compared to the atmospheric probability density distributions. Empirical distributions of extreme value monthly block data are derived for the experimental and atmospheric cases. Generalized extreme value distributions are adjusted to the empirical distributions, and the distribution parameters are compared. Good agreement was found, but the distributions of the experimental data showed a shift toward larger extreme values, and some explanations for this shift are suggested. The results indicate that the laboratory model might be a useful tool for investigating changes in extreme event distributions due to climate change. In the laboratory context, the change can be modeled by an increase in total temperature accompanied by a reduction in the radial heat contrast. Y1 - 2022 U6 - https://doi.org/10.3390/fluids7080274 SN - 2311-5521 VL - 7 IS - 8 ER - TY - GEN A1 - Rodda, Costanza A1 - Harlander, Uwe A1 - Vincze, Miklos T1 - Jet stream variability in a polar warming scenario – a laboratory perspective T2 - Weather and Climate Dynamics Y1 - 2022 UR - https://wcd.copernicus.org/articles/3/937/2022/ U6 - https://doi.org/10.5194/wcd-3-937-2022 SN - 2698-4016 VL - 3 IS - 3 SP - 937 EP - 950 ER - TY - GEN A1 - Borcia, Ion-Dan A1 - Richter, Sebastian A1 - Borcia, Rodica A1 - Schön, Franz-Theo A1 - Harlander, Uwe A1 - Bestehorn, Michael T1 - Wave propagation in a circular channel: sloshing and resonance T2 - The European Physical Journal Special Topics N2 - Surface wave resonance of a liquid (water) layer confined in a circular channel is studied both experimentally and numerically. For the experiment, eight unevenly distributed ultrasonic distance sensors measure the local height of the wave surface. The resonance curves show maxima only for odd multiples of the fundamental resonance frequency . We explained this behavior using a simple intuitive “ping-pong” like model. Collision of wave fronts can be observed for higher frequencies. Also, the wave reflection on the walls can be treated as wave collision with itself. The non-linearity seems to be weak in our study so the delay in the wave propagation before and after the collision is small. Time-space plots show localized propagating waves with high amplitudes for frequencies near resonance. Between the peaks low amplitude and harmonic patterns are observed. However, for higher frequencies, the frequency band for localized waves becomes wider. In the Fourier space-time plane, this can be observed as a point for the harmonic patterns or a superposition of two lines: one line parallel to wave-vector k axis corresponding to the excitation frequency and a second line with inclination given by wave propagation velocity . For planned future work, this result will help us to reconstruct the whole water surface elevation using time-series from only a few measurement points Y1 - 2023 UR - https://link.springer.com/article/10.1140/epjs/s11734-023-00790-z U6 - https://doi.org/10.1140/epjs/s11734-023-00790-z SN - 1951-6401 SN - 1951-6355 VL - Vol. 232 IS - 4 SP - 461 EP - 468 ER - TY - GEN A1 - Labarbe, Joris A1 - Le Gal, Patrice A1 - Harlander, Uwe A1 - Le Dizès, Stéphane A1 - Favier, Benjamin T1 - Localized layers of turbulence in stratified horizontally sheared Poiseuille flow T2 - Fluid Dynamics Y1 - 2023 UR - https://arxiv.org/abs/2207.09131 ER - TY - GEN A1 - Harlander, Uwe A1 - Sukhanovskii, Andrei A1 - Abide, Stéphane A1 - Borcia, Ion-Dan A1 - Popova, Elene A1 - Rodda, Costanza A1 - Vasiliev, Andrei A1 - Vincze, Miklos T1 - New Laboratory Experiments to Study the Large-Scale Circulation and Climate Dynamics T2 - Atmosphere N2 - The large-scale flows of the oceans and the atmosphere are driven by a non-uniform surface heating over latitude, and rotation. For many years scientists try to understand these flows by doing laboratory experiments. In the present paper we discuss two rather new laboratory experiments designed to study certain aspects of the atmospheric circulation. One of the experiments, the differentially heated rotating annulus at the Brandenburg University of Technology (BTU) Cottbus, has a cooled inner cylinder and a heated outer wall. However, the structure of the atmospheric meridional circulation motivates a variation of this “classical” design. In the second experiment described, operational at the Institute of Continuous Media Mechanics (ICMM) in Perm, heating and cooling is performed at different vertical levels that resembles more the atmospheric situation. Recent results of both experiments are presented and discussed. Differences and consistencies are highlighted. Though many issues are still open we conclude that both setups have their merits. The variation with heating and cooling at different levels might be more suited to study processes in the transition zone between pure rotating convection and the zone of westerly winds. On the other hand, the simpler boundary conditions of the BTU experiment make this experiment easier to control. Y1 - 2023 UR - https://www.mdpi.com/2073-4433/14/5/836 U6 - https://doi.org/10.3390/atmos14050836 VL - 14 IS - 5 ER - TY - GEN A1 - Maltese Meletti de Oliveira, Gabriel A1 - Abide, Stéphane A1 - Viazzo, Stephane A1 - Harlander, Uwe T1 - A parameter study of strato-rotational low-frequency modulations: impacts on momentum transfer and energy distribution T2 - Philosophical transactions of the Royal Society : Series A, Mathematical, physical and engineering sciences Y1 - 2023 U6 - https://doi.org/10.1098/rsta.2022.0297 SN - 1364-503X SN - 1471-2962 VL - 381 IS - 2246 ER - TY - GEN A1 - Vincze, Miklos A1 - Hancock, Cathrine A1 - Harlander, Uwe A1 - Rodda, Costanza A1 - Speer, Kevin T1 - Extreme temperature fluctuations in laboratory models of the mid-latitude atmospheric circulation T2 - Scientific reports Y1 - 2023 U6 - https://doi.org/10.1038/s41598-023-47724-2 VL - 13 (2023) ER - TY - GEN A1 - Harlander, Uwe A1 - Kurgansky, Michael V. A1 - Speer, Kevin A1 - Vincze, Miklos T1 - Baroclinic instability from an experimental perspective T2 - Comptes Rendus Physique Y1 - 2024 U6 - https://doi.org/10.5802/crphys.198 VL - 25 (2024) SP - 1 EP - 48 ER - TY - GEN A1 - Schön, Franz-Theo A1 - Harlander, Uwe A1 - Borcia, Ion Dan A1 - Borcia, Rodica A1 - Bestehorn, Michael T1 - Mean fluid transport in an oscillating circular channel with asymmetric forcing T2 - Water waves : an interdisciplinary journal N2 - We investigate surface waves in an oscillating circular channel with local topography. The focus is on spatially or temporally breaking this dynamic system’s symmetry. Asymmetrical wave dynamics and a mean flux excitation are detected to varying degrees, depending on the two input parameters, fluid depth and the tank’s oscillation frequency. The fluid resonates around multiples of the fundamental eigenfrequency of the channel. The development of solitary wave-trains (undular bores) is observed in these resonance bands. A particle image velocimetry system measures the velocity field in the vertical plane of the free surface flow. Moreover, we are using 17 evenly distributed ultrasonic sensors to measure the surface displacement. This makes it possible to find out how strongly the mean flux depends on the resonance frequencies and to study the influence of the surface waves on the symmetry breaking. A numerical long-wave model helps to isolate the various factors influencing the mean flux. Y1 - 2025 U6 - https://doi.org/10.1007/s42286-025-00121-w SN - 2523-3688 VL - 2025 SP - 1 EP - 21 PB - Birkhäuser, part of Springer Nature CY - Basel ER - TY - GEN A1 - Meletti, Gabriel A1 - Abide, Stéphane A1 - Harlander, Uwe A1 - Raspo, Isabelle A1 - Stéphane Viazzo, Stéphane T1 - On the influence of the heat transfer at the free surface of a thermally driven rotating annulus T2 - Physics of fluids N2 - Experiments on rotating annuli that are differentially heated in the radial direction have largely contributed to a better understanding of baroclinic instabilities. This configuration creates waves at a laboratory scale that are related to atmospheric circulations. Pioneer studies in baroclinic tanks have shown that experiments with low aspect ratios are more suitable to reproduce small-scale inertia gravity waves, but these tanks have a larger free surface, which leads to higher interactions with their surrounding environment. Considering the heat transferred through the free surface, the present work investigates its impacts on the baroclinic instability using direct numerical simulations (DNS). Y1 - 2025 U6 - https://doi.org/10.1063/5.0248712 SN - 1089-7666 VL - 37 SP - 1 EP - 16 PB - AIP Publishing CY - College Park, MD ER -