TY - GEN A1 - Futterer, Birgit A1 - Yoshikawa, Harunori A1 - Mutabazi, Innocent A1 - Egbers, Christoph ED - Beysens, Daniel ED - Loon, Jacobus van T1 - Facilities to alter weight - Electric Fields T2 - Generation and Applications of Extra-Terrestrial Environments on Earth Y1 - 2015 SN - 978-87-93237-53-7 SN - 978-87-93237-54-4 SP - 91 EP - 100 PB - River Publ. CY - Aalborg ER - TY - GEN A1 - Vincze, Miklos A1 - Borchert, Sebastian A1 - Achatz, Ulrich A1 - Larcher, Thomas von A1 - Baumann, Martin A1 - Liersch, Claudia A1 - Remmler, Sebastian A1 - Beck, Teresa A1 - Alexandrov, Kiril A1 - Egbers, Christoph A1 - Fröhlich, Jochen A1 - Heuveline, Vincent A1 - Hickel, Stefan A1 - Harlander, Uwe T1 - Benchmarking in a rotating annulus: a comparative experimental and numerical study of baroclinic wave dynamics T2 - Meteorologische Zeitschrift Y1 - 2015 U6 - https://doi.org/10.1127/metz/2014/0600 SN - 1610-1227 SN - 0941-2948 VL - 23 IS - 6 SP - 611 EP - 635 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 - 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 - GEN A1 - Egbers, Christoph A1 - Gorenz, Paul A1 - Schmidt, Marcus A1 - Wolf, Carsten T1 - 3-D-CFD-Simulation der Schmierspaltströmung in einem Radialgleitlager T2 - Motortechnische Zeitschrift : MTZ Y1 - 2015 SN - 2192-8843 VL - 76 IS - 7-8 SP - 66 EP - 73 ER - TY - THES A1 - Christl, Andreas T1 - 3D-CFD-Simulation der exzentrischen Taylor-Couette Strömung mit Bezug auf das hydrodynamische Gleitlager Y1 - 2015 SN - 978-3-73699-081-4 SP - II, 109 PB - Cuvillier CY - Göttingen ER - TY - THES A1 - König, Franziska T1 - Investigation of High Reynolds Number Pipe Flow Y1 - 2015 SN - 978-3-73699-049-4 PB - Cuvillier CY - Göttingen 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 - Martinez-Arias, Borja A1 - Peixinho, Jorge A1 - Froitzheim, Andreas A1 - Merbold, Sebastian A1 - Egbers, Christoph A1 - Mutabazi, Innocent T1 - Influence of the radius ratio on the torque in turbulent Taylor-Couette flow T2 - ICTW 19, Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 30 EP - 31 CY - Cottbus ER - TY - CHAP A1 - Froitzheim, Andreas A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Wide gap Taylor-Couette flow T2 - ICTW 19, Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 28 EP - 29 CY - Cottbus ER -