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 - Froitzheim, Andreas A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - PIV Messungen in einer Taylor-Couette Strömung mit weitem Spalt T2 - Lasermethoden in der Strömungsmesstechnik, 23. Fachtagung, 8. - 10. September 2015, Dresden Y1 - 2015 SN - 978-3-9816764-1-9 SP - S. 27 PB - GALA CY - Karlsruhe 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 - 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 - 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 - 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 - 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 - 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 -