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 -