@misc{FuttererYoshikawaMutabazietal., author = {Futterer, Birgit and Yoshikawa, Harunori and Mutabazi, Innocent and Egbers, Christoph}, title = {Facilities to alter weight - Electric Fields}, series = {Generation and Applications of Extra-Terrestrial Environments on Earth}, journal = {Generation and Applications of Extra-Terrestrial Environments on Earth}, editor = {Beysens, Daniel and Loon, Jacobus van}, publisher = {River Publ.}, address = {Aalborg}, isbn = {978-87-93237-53-7}, pages = {91 -- 100}, language = {en} } @misc{HoffHarlanderEgbers, author = {Hoff, Michael and Harlander, Uwe and Egbers, Christoph}, title = {Empirical singular vectors of baroclinic flows deduced from experimental data of a differentially heated rotating annulus}, series = {Meteorologische Zeitschrift}, volume = {23}, journal = {Meteorologische Zeitschrift}, number = {6}, doi = {10.1127/metz/2014/0563}, pages = {581 -- 597}, language = {en} } @misc{VinczeBorchertAchatzetal., author = {Vincze, Miklos and Borchert, Sebastian and Achatz, Ulrich and Larcher, Thomas von and Baumann, Martin and Liersch, Claudia and Remmler, Sebastian and Beck, Teresa and Alexandrov, Kiril and Egbers, Christoph and Fr{\"o}hlich, Jochen and Heuveline, Vincent and Hickel, Stefan and Harlander, Uwe}, title = {Benchmarking in a rotating annulus: a comparative experimental and numerical study of baroclinic wave dynamics}, series = {Meteorologische Zeitschrift}, volume = {23}, journal = {Meteorologische Zeitschrift}, number = {6}, issn = {1610-1227}, doi = {10.1127/metz/2014/0600}, pages = {611 -- 635}, language = {en} } @inproceedings{HasanuzzamanMerboldEgbers, author = {Hasanuzzaman, Gazi and Merbold, Sebastian and Egbers, Christoph}, title = {Experimentelle Untersuchung von Geb{\"a}ude-integrierten Windf{\"u}hrungen mit Laser-Doppler- Anemometrie}, series = {Lasermethoden in der Str{\"o}mungsmesstechnik, 23. Fachtagung, 8. - 10. September 2015, Dresden}, booktitle = {Lasermethoden in der Str{\"o}mungsmesstechnik, 23. Fachtagung, 8. - 10. September 2015, Dresden}, editor = {Czarske, J{\"u}rgen}, publisher = {GALA}, address = {Karlsruhe}, isbn = {978-3-9816764-1-9}, pages = {S. 64}, language = {de} } @misc{KupkaLoschZaussingeretal., author = {Kupka, Friedrich and Losch, Martin and Zaussinger, Florian and Zweigle, Thomas}, title = {Semi-convection in the ocean and in stars: A multi-scale analysis}, series = {Meteorologische zeitschrift}, volume = {24}, journal = {Meteorologische zeitschrift}, number = {3}, issn = {0941-2948}, doi = {10.1127/metz/2015/0643}, pages = {343 -- 358}, abstract = {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 MetStr{\"o}m 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.}, language = {en} } @misc{SeeligKielczewskiTuliszkaSznitkoetal., author = {Seelig, Torsten and Kielczewski, Kamil and Tuliszka-Sznitko, Ewa M. and Harlander, Uwe and Egbers, Christoph and Bontoux, Patrick}, title = {Taylor-Couette flow with asymmetric end-walls boundary conditions}, series = {15th European turbulence conference (ETC), Delft, The Netherlands (2015)}, journal = {15th European turbulence conference (ETC), Delft, The Netherlands (2015)}, language = {en} } @inproceedings{KleinGhasemiSeeligetal., author = {Klein, Marten and Ghasemi, Abouzar and Seelig, Torsten and Borcia, Ion-Dan and Harlander, Uwe and Will, Andreas}, title = {DNS of inertial wave attractors in a librating annulus with height-dependent gap width}, series = {15th European turbulence conference (ETC), Delft, The Netherlands (2015)}, booktitle = {15th European turbulence conference (ETC), Delft, The Netherlands (2015)}, abstract = {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.}, language = {en} } @inproceedings{SeeligGhasemiKurganskyetal., author = {Seelig, Torsten and Ghasemi, Abouzar and Kurgansky, Michael V. and Klein, Marten and Will, Andreas and Harlander, Uwe}, title = {Mean flow generation due to longitudinal librations of sidewalls of a rotating annulus}, series = {15th European turbulence conference (ETC), Delft, The Netherlands (2015)}, booktitle = {15th European turbulence conference (ETC), Delft, The Netherlands (2015)}, language = {en} } @misc{EgbersGorenzSchmidtetal., author = {Egbers, Christoph and Gorenz, Paul and Schmidt, Marcus and Wolf, Carsten}, title = {3-D-CFD-Simulation der Schmierspaltstr{\"o}mung in einem Radialgleitlager}, series = {Motortechnische Zeitschrift : MTZ}, volume = {76}, journal = {Motortechnische Zeitschrift : MTZ}, number = {7-8}, issn = {2192-8843}, pages = {66 -- 73}, language = {de} } @inproceedings{HoffHarlanderJahangiretal., author = {Hoff, Michael and Harlander, Uwe and Jahangir, Saad and Egbers, Christoph}, title = {Experimental study of inertial waves in a spherical shell induced by librations of the inner sphere}, series = {European Geosciences Union, General Assembly 2015, Vienna, Austria, 13 April - 17 May 2015}, booktitle = {European Geosciences Union, General Assembly 2015, Vienna, Austria, 13 April - 17 May 2015}, publisher = {European Geophysical Society}, address = {Katlenburg-Lindau}, language = {en} }