TY - GEN A1 - Harlander, Uwe A1 - Larcher, Thomas von A1 - Wang, Yongtai A1 - Egbers, Christoph T1 - PIV- and LDV-measurements of baroclinic wave interactions in a thermally driven rotating annulus Y1 - 2011 U6 - https://doi.org/10.1007/s00348-009-0792-5 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 - Scurtu, Nicoleta A1 - Futterer, Birgit A1 - Egbers, Christoph T1 - Pulsating and traveling wave modes of natural convection in spherical shells Y1 - 2010 ER - TY - CHAP A1 - Futterer, Birgit A1 - Egbers, Christoph ED - Eckhardt, Bruno T1 - Quasi-stationary and chaotic convection in low rotating spherical shells T2 - Advances in turbulence XII, proceedings of the 12th EUROMECH European Turbulence Conference, September, 2009, Marburg, Germany Y1 - 2009 SN - 978-3-642-03084-0 SP - 97 EP - 101 PB - Springer CY - Berlin [u.a.] ER - TY - CHAP A1 - Sitte, B. A1 - Immohr, J. A1 - Hinrichs, O. A1 - Meier, R. A1 - Egbers, Christoph A1 - Rath, H. J. T1 - Rayleigh-Benard convection in dielectrophoretic force fields Y1 - 2001 ER - TY - GEN A1 - Grimm-Strele, Hannes A1 - Kupka, Friedrich A1 - Löw-Baselli, Bernhard A1 - Mundprecht, Eva A1 - Zaussinger, Florian A1 - Schiansky, Peter T1 - Realistic simulations of stellar surface convection with ANTARES: I. Boundary conditions and model relaxation T2 - New Astronomy Y1 - 2015 UR - http://www.sciencedirect.com/science/article/pii/S1384107613001383 U6 - https://doi.org/10.1016/j.newast.2013.11.005 SN - 1384-1076 VL - 34 SP - 278 EP - 293 ER - TY - CHAP A1 - Harlander, Uwe A1 - Wright, G. B. A1 - Egbers, Christoph T1 - Reconstruction of the 3D flow field in a differentially heated rotating annulus by synchronized particle image velocimetry and infrared thermography measurements T2 - 16th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 09-12 July, Proceedings, Calouste Gulbenkian Foundation, Lisbon, Portugal Y1 - 2012 UR - http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2012/program.asp ER - TY - CHAP A1 - Harlander, Uwe A1 - Wright, G. B. A1 - Egbers, Christoph T1 - Reconstruction of the 3D flow field in a differentially heated rotating annulus laboratory experiment T2 - European Geosciences Union (EGU), 9th General Assembly, Vienna, Austria, 22-27 April Y1 - 2012 UR - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-5368.pdf N1 - EGU2012-5368 ER - TY - CHAP A1 - Jehring, Lothar A1 - Zanoun, El-Sayed T1 - Reducing environmental impact by mean of active flow control Y1 - 2005 ER - TY - CHAP A1 - Merbold, Sebastian A1 - Hasanuzzaman, Gazi A1 - Buchwald, Tom A1 - Schunk, Christoph A1 - Schmeling, Daniel A1 - Volkmann, André A1 - Brinkema, Robert A1 - Hampel, Uwe A1 - Schröder, Andreas A1 - Egbers, Christoph ED - Cierpka, Christian T1 - Reference experiment for aerosol particle transport for dynamic situations T2 - Experimentelle Strömungsmechanik : 29. Fachtagung, 6.-8. September 2022, Ilmenau T2 - Referenzexperiment zum Aerosolpartikel-Transport für dynamische Situationen Y1 - 2022 UR - https://www.gala-ev.org/images/Beitraege/Beitraege2022/pdf/09.pdf SN - 978-3-9816764-8-8 PB - Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V. CY - Karlsruhe ER - TY - GEN A1 - Merbold, Sebastian A1 - Hasanuzzaman, Gazi A1 - Buchwald, Tom A1 - Schunk, Christoph A1 - Schmeling, Daniel A1 - Volkmann, André A1 - Brinkema, Robert A1 - Hampel, Uwe A1 - Schröder, Andreas A1 - Egbers, Christoph T1 - Reference experiment on aerosol particle transport for dynamic situations T2 - tm - Technisches Messen Y1 - 2023 U6 - https://doi.org/10.1515/teme-2022-0118 SN - 2196-7113 VL - 90 IS - 5 ER - TY - GEN A1 - Zanoun, El-Sayed A1 - Durst, F. A1 - Nagib, H. M. T1 - Refined Cf relation for turbulent channels and consequences for high Re experiments Y1 - 2009 ER - TY - JOUR A1 - Zanoun, El-Sayed A1 - Durst, F. A1 - Nagib, H. M. T1 - Response to "Comment on 'Evaluating the law of the wall in two-dimensional fully developed turbulent channel flows' " Y1 - 2004 ER - TY - GEN A1 - Zanoun, El-Sayed A1 - Dewidar, Yasser A1 - Egbers, Christoph T1 - Reynolds number dependence of azimuthal and streamwise pipe flow structures T2 - Journal of Fluid Mechanics Y1 - 2023 U6 - https://doi.org/10.1017/jfm.2023.700 SN - 0022-1120 VL - Vol. 973 SP - 1 EP - 36 ER - TY - GEN A1 - Harlander, Uwe A1 - Wenzel, Julia A1 - Egbers, Christoph T1 - Rotating annulus laboratory experiments with application to baroclinic channel flows with narrows Y1 - 2010 ER - TY - GEN A1 - Zaussinger, Florian A1 - Haun, Peter A1 - Szabo, Peter A1 - Travnikov, Vadim A1 - Al-Kawwas, Mustafa A1 - Egbers, Christoph T1 - Rotating spherical gap convection in the GeoFlow International Space Station (ISS) experiment T2 - Physical Review Fluids Y1 - 2020 U6 - https://doi.org/10.1103/PhysRevFluids.5.063502 SN - 2469-990X VL - 5 IS - 6 ER - TY - CHAP A1 - Zanoun, El-Sayed A1 - Durst, F. A1 - Nagib, H. M. T1 - Scaling Laws for Turbulent Channel and Pipe Flows over a Wide Range of Reynolds Number Y1 - 2005 ER - TY - CHAP A1 - Augenstein, Edgar A1 - Leopold, F. A1 - Richard, H. T1 - Schlieren Techniques in Comparison The Background Oriented Method versus Visualization with Holographic Filters Y1 - 2001 ER - TY - GEN A1 - Kupka, Friedrich A1 - Losch, Martin A1 - Zaussinger, Florian A1 - Zweigle, Thomas T1 - Semi-convection in the ocean and in stars: A multi-scale analysis T2 - Meteorologische zeitschrift N2 - Fluid stratified by gravitation can be subject to a number of instabilities which eventually lead to a flow that causes enhanced mixing and transport of heat. The special case where a destabilizing temperature gradient counteracts the action of a stabilizing gradient in molecular weight is of interest to astrophysics (inside stars and giant planets) and geophysics (lakes, oceans) as well as to some engineering applications. The detailed dynamics of such a system depend on the molecular diffusivities of heat, momentum, and solute as well as system parameters including the ratio of the two gradients to each other. Further important properties are the formation and merging of well-defined layers in the fluid which cannot be derived from linear stability analysis. Moreover, the physical processes operate on a vast range of length and time scales. This has made the case of semi-convection, where a mean temperature gradient destabilizes the stratification while at the same time the mean molecular gradient tends to stabilize it, a challenge to physical modelling and to numerical hydrodynamical simulation. During the MetStröm project the simulation codes ANTARES and MITgcm have been extended such that they can be used for the simulations of such flows. We present a comparison of effective diffusivities derived from direct numerical simulations. For both stars and the oceanic regimes, the Nusselt numbers (scaled diffusivities) follow similar relationships. Semi-convection quickly becomes inefficient, because the formation of layers limits vertical mixing. In contrast to the complementary saltfingering, these layers tend to damp instabilities so that effective diffusivities of salinity (concentration) are up to two orders of magnitudes smaller than in the former case. KW - hydrodynamics KW - numerical simulation KW - turbulence Y1 - 2015 UR - https://www.schweizerbart.de/papers/metz/detail/24/84729/Semi_convection_in_the_ocean_and_in_stars_A_multi_scale_analysis?l=DE U6 - https://doi.org/10.1127/metz/2015/0643 SN - 0941-2948 VL - 24 IS - 3 SP - 343 EP - 358 ER - TY - GEN A1 - Zaussinger, Florian A1 - Kupka, Friedrich A1 - Egbers, Christoph A1 - Neben, Matthias A1 - Hücker, S. A1 - Bahr, C. A1 - Schmitt, M. T1 - Semi-convective layer formation T2 - Journal of Physics: Conference Series Y1 - 2017 U6 - https://doi.org/10.1088/1742-6596/837/1/012012 VL - 837 IS - 1 ER - TY - GEN A1 - Zaussinger, Florian T1 - Semiconvection Y1 - 2011 N1 - Poster ER - TY - GEN A1 - Zaussinger, Florian T1 - Semiconvection Y1 - 2011 ER - TY - GEN A1 - Futterer, Birgit A1 - Krebs, Andreas A1 - Plesa, Ana-Catalina A1 - Zaussinger, Florian A1 - Hollerbach, Rainer A1 - Breuer, Doris A1 - Egbers, Christoph T1 - Sheet-like and plume-like thermal flow in a spherical convection experiment performed under microgravity T2 - Journal of Fluid Mechanics Y1 - 2013 U6 - https://doi.org/10.1017/jfm.2013.507 SN - 1750-6859 VL - vol. 735 SP - 647 EP - 683 ER - TY - CHAP A1 - Egbers, Christoph A1 - Zaussinger, Florian T1 - Simulation of geophysical fluid flows in spherical shells: The Geoflow experiments on ISS 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 - Egbers, Christoph A1 - Hollerbach, Rainer A1 - Chossat, P. T1 - Simulation of geophysical fluid flows under microgravity Y1 - 2001 ER - TY - CHAP A1 - Egbers, Christoph T1 - Simulation of Geophysical Fluid Flows under Microgravity (GeoFlow): Flow diagnostics and experiment concept for Fluid Science experiments T2 - Proceedings of 11th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, 8-11th July 2002 Y1 - 2002 UR - http://in3.dem.ist.utl.pt/lxlaser2002/papers/paper_28_2.pdf ER - TY - GEN A1 - Szabo, Peter A1 - Meyer, Antoine A1 - Meier, Martin A1 - Motuz, Vasyl A1 - Sliavin, Yaraslau A1 - Egbers, Christoph T1 - Simultaneous PIV and shadowgraph measurements of thermo-electrohydrodynamic convection in a differentially heated annulus T2 - Technisches Messen Y1 - 2022 U6 - https://doi.org/10.1515/teme-2021-0120 SN - 2196-7113 VL - 89 IS - 3 SP - 148 EP - 157 ER - TY - GEN A1 - Harlander, Uwe A1 - Wenzel, Julia A1 - Wang, Yongtai A1 - Alexandrov, Kiril A1 - Egbers, Christoph T1 - Simultaneous PIV- and thermography-measurements of partially blocked flow in a heated rotating annulus Y1 - 2011 ER - TY - GEN A1 - Harlander, Uwe A1 - Wenzel, Julia A1 - Alexandrov, Kiril A1 - Wang, Yongtai A1 - Egbers, Christoph T1 - Simultaneous PIV- and thermography-measurements of partially blocked flow in a heated rotating annulus T2 - Experiments in Fluids Y1 - 2012 U6 - https://doi.org/10.1007/s00348-011-1195-y SN - 1432-1114 VL - 52 IS - 4 SP - 1077 EP - 1087 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 - 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 - Alexandrov, Kiril A1 - Harlander, Uwe A1 - Egbers, Christoph T1 - Spatial spectra of regular and irregular rotating annulus flows: Statistical scale classification in terms of empirical orthogonal functions Y1 - 2011 ER - TY - GEN A1 - Zanoun, El-Sayed A1 - Öngüner, Emir A1 - Shahirpour, Amir A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Spectral Analysis of Large Scale Structures in Fully Developed Turbulent Pipe Flow T2 - Proceedings in applied mathematics and mechanics : PAMM Y1 - 2018 U6 - https://doi.org/10.1002/pamm.201710293 SN - 1617-7061 N1 - Special Issue: 88th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Weimar 2017; Editors: C. Könke, Weimar, and C. Trunk, Ilmenau VL - 17 IS - 1 SP - 647 EP - 650 ER - TY - CHAP A1 - Egbers, Christoph A1 - Shahirpour, Amir A1 - Öngüner, Emir A1 - Zanoun, El-Sayed T1 - Spectral Analysis of Large Scale Structures in Fully Developed Turbulent Pipe Flow 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. 46 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 - CHAP A1 - Koch, Sandy A1 - Dahley, Norman A1 - Futterer, Birgit A1 - Egbers, Christoph T1 - Sphärische Wollaston-Schlieren-Interferometrie: Raum-Zeit-Analyse von unter- und überkritischer Konvektion im rotierenden Kugelspalt (GeoFlow-Experiment) Y1 - 2009 ER - TY - CHAP A1 - Meincke, Oliver A1 - Egbers, Christoph A1 - Scurtu, Nicoleta A1 - Bänsch, E. T1 - Stability and dynamics in asymmetric Taylor-Couette flow Y1 - 2001 ER - TY - GEN A1 - Meyer, Antoine A1 - Meier, Martin A1 - Szabo, Peter A1 - Sliavin, Yaraslau A1 - Egbers, Christoph A1 - Gerstner, Philipp A1 - Motuz, Vasyl A1 - Roller, Jonas A1 - Heuveline, Vincent T1 - Stability of a dielectric liquid confined in a differentially heated vertical Taylor-Couette system with applied radial electric field T2 - International Symposium on Bifurcations and Instabilities in Fluid Dynamics Y1 - 2022 UR - https://www.bifd2022.org/scientific-programme SP - 23 ER - TY - JOUR A1 - Travnikov, Vadim A1 - Rath, H. J. A1 - Egbers, Christoph T1 - Stability of natural convection between spherical shells: Energy Theory Y1 - 2002 ER - TY - CHAP A1 - Tappe, Stephanie A1 - Meier, M. ED - Vignes-Adler, Michèle T1 - Stability of Three-Phase-Foams - an Experimental Approach T2 - A collection of papers presented at the 5th European Conference on Foams, Emulsions, and Applications, EUFOAM 2004 Y1 - 2004 PB - Elsevier CY - Amsterdam [u.a.] ER - TY - GEN A1 - Froitzheim, Andreas A1 - Ezeta, Rodrigo A1 - Huisman, Sander G. A1 - Merbold, Sebastian A1 - Sun, Chao A1 - Lohse, Detlef A1 - Egbers, Christoph T1 - Statistics, plumes and azimuthally travelling waves in ultimate Taylor–Couette turbulent vortices T2 - Journal of Fluid Mechanics Y1 - 2019 U6 - https://doi.org/10.1017/jfm.2019.552 SN - 1469-7645 SN - 0022-1120 VL - Volume 876 SP - 733 EP - 765 ER - TY - CHAP A1 - Zanoun, El-Sayed A1 - Motuz, Vasyl A1 - Egbers, Christoph A1 - Keller, J. A1 - Dörner, K. ED - Kähler, Christian J. ED - Hain, Rainer ED - Scharnowski, Sven ED - Fuchs, Thomas T1 - Stereoscopic-PIV and Hot Wire Measurements in Pipe Flow at Relatively High T2 - Proceedings of the 5th International Conference on Experimental Fluid Mechanics, Munich 2018 Y1 - 2018 SN - 978-3-943207-32-3 U6 - https://doi.org/10.18726/2018_2 SP - 877 EP - 882 PB - Institute of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr CY - Neubiberg ER - TY - THES A1 - Hoff, Michael T1 - Stewartson layers, inertial waves and wave instabilities in a spherical-gap flow: Laboratory experiments with full optical acces Y1 - 2017 SN - 978-3-7369-9644-1 SN - 3-7369-9644-6 PB - Cuvillier Verlag CY - Göttingen 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 - 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 - 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 - CHAP A1 - Öngüner, Emir A1 - Zanoun, El-Sayed A1 - Egbers, Christoph ED - Örlü, Ramis ED - Talamelli, Alessandro ED - Peinke, Joachim ED - Oberlack, Martin T1 - Streamwise Auto-Correlation Analysis in Turbulent Pipe Flow Using Particle Image Velocimetry at High Reynolds Numbers T2 - Progress in Turbulence VII, Proceedings of the iTi Conference in Turbulence 2016 Y1 - 2017 UR - https://link.springer.com/chapter/10.1007/978-3-319-57934-4_16 SN - 978-3-319-57933-7 SP - 107 EP - 112 PB - Springer CY - Cham ER - TY - CHAP A1 - Öngüner, Emir A1 - Zanoun, El-Sayed A1 - König, Franziska A1 - Egbers, Christoph T1 - Structure Investigation in Pipe Flow at High Reynolds Numbers Y1 - 2016 SN - 978-3-319-29130-7 SP - 217 EP - 220 PB - Springer CY - Berlin ER - TY - THES A1 - Smieszek, Marlene T1 - Structures and stability of Newtonian and non-Newtonian fluids in Taylor-Couette system Y1 - 2008 SN - 978-3-18-349107-0 PB - Düsseldorf : VDI-Verl ER - TY - CHAP A1 - Meier, Martin A1 - Szabo, Peter A1 - Motuz, Vasyl A1 - Egbers, Christoph T1 - Strömungsfeldvisualisierung von thermo-elektrodynamischer Konvektion mit einer kombinierten PIV- und Schattentechnik T2 - Experimentelle Strömungsmechanik : 28. Fachtagung, 7.-9. September 2021, Bremen T2 - Flow field visualisation of thermo-electrodynamic convection utilising a combined PIV and Shadowgraph technique Y1 - 2021 SN - 978-3-9816764-7-1 SP - 6 PB - Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V. CY - Karlsruhe ER -