TY - CHAP A1 - Futterer, Birgit A1 - Zaussinger, Florian A1 - Krebs, Andreas A1 - Egbers, Christoph T1 - Non-linear effects and associated instabilities in spherical Rayleigh-Benard experiments with variation of the viscosity contrast Y1 - 2011 ER - TY - CHAP A1 - Futterer, Birgit A1 - Zaussinger, Florian A1 - Koch, Sandy A1 - Krebs, Andreas A1 - Egbers, Christoph T1 - Nonlinear effects and associated instabilities in iso-viscous and temperature-dependent viscous thermal convection in spherical shells, the geophysical flow simulation experiment integrated in Fluid Science Laboratory Y1 - 2011 ER - TY - GEN A1 - Futterer, Birgit A1 - Zaussinger, Florian A1 - Egbers, Christoph A1 - Scurtu, Nicoleta T1 - Variation of viscosity contrast for convection experiments in spherical shells as part of geophy-sical flow simulation experiment "GeoFlow II" Y1 - 2011 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 - 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 - 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 - 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 - Zaussinger, Florian A1 - Egbers, Christoph A1 - Krebs, Andreas A1 - Travnikov, Vadim T1 - New results of the spherical convection experiment Geoflow IIc T2 - European Geosciences Union General Assembly 2017 Vienna, Austria, 23–28 April 2017 Y1 - 2017 UR - http://meetingorganizer.copernicus.org/EGU2017/EGU2017-7801.pdf N1 - EGU2017-7801 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Zaussinger, Florian A1 - Krebs, Andreas A1 - Breuer, Doris A1 - Plesa, Ana-Catalina A1 - Egbers, Christoph T1 - Convection in the spherical gap with high viscosity contrasts T2 - ICTW 19, Book of Abstracts, 19th International Couette-Taylor Workshop, June 24 - 26, 2015 Cottbus, Germany Y1 - 2015 SP - 88 EP - 89 CY - Cottbus ER - TY - CHAP A1 - Zaussinger, Florian A1 - Christl, Andreas A1 - Gorenz, Paul A1 - Neben, Matthias A1 - Egbers, Christoph T1 - An applied Couette-Taylor system as a simplified bearing model T2 - Book of abstracts, ICTW 19, 19th International Couette-Taylor Workshop, June 24-26, 2015 Cottbus, Germany Y1 - 2015 SP - 170 EP - 171 PB - BTU CY - Cottbus 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 - Travnikov, Vadim A1 - Zaussinger, Florian A1 - Beltrame, Philippe A1 - Egbers, Christoph T1 - Influence of the temperature-dependent viscosity on convective flow in the radial force field T2 - Physical Review / E Y1 - 2017 U6 - https://doi.org/10.1103/PhysRevE.96.023108 SN - 2470-0053 VL - 96 IS - 2 SP - 023108 ER - TY - CHAP A1 - Zaussinger, Florian A1 - Egbers, Christoph A1 - Krebs, Andreas T1 - The GeoFlow experiments on the ISS: Thermal convection under microgravity conditions T2 - Joint Conference ISPS-7 and ELGRA-25 October, 2–6 2017, Juan-les-Pins, France, Abstract book Y1 - 2017 SP - S. 30 ER - TY - RPRT A1 - Uhlig, Benedict A1 - Kirner, Claus A1 - Preuß, Ann-Christin A1 - Graf, Johann A1 - Neben, Matthias A1 - Zaussinger, Florian T1 - Kolbenring-Öltransport II : Öltransport durch die Kolbenringe N2 - Ziele des Vorhabens sind die Verbesserung der Messtechnik für tribologische Untersuchungen in der Kolbengruppe aus dem Vorläufervorhaben Kolbenring-Öltransport I und die Untersuchung von verschiedenen Betriebsbedingungen und Komponenten hinsichtlich ihres Einflusses auf den Ölhaushalt. Der Fokus liegt auf der verbesserten Auflösung der Schmierfilmdickenmessung und der Ringstoßlagen. Mit der erweiterten Kapillar- und Lichtleiterkonfiguration werden neue Öltransportvorgänge entlang des Kolbenringpakets mittels Tracerinjektion und simultaner LiF-Messung beobachtet. Das methodische Vorgehen bei der optischen Analyse des Kapillarfüllungsgrades wird an einem Labor-Druckprüfstand weiterentwickelt. Des Weiteren werden komplexe Simulationsmodelle erstellt, mit denen die Kolbensekundär-bewegung, die Kolbenringbewegung, die Gasströmung im Ringpaket und der Öltransport im Ringpaket geklärt werden können. Die Kolbensekundärbewegungsrechnung basiert auf einer FEM-Diskretisierung die aus CAD-Modellen sämtlicher Bauteile abgeleitet ist. Die dreidimensionale Berechnung der Kolbenringbewegung erfolgt unter Berücksichtigung dynamisch wirkender Kräfte aus der Bewegung, der Ringreibung, dem Gasdruck und den Zwischenring- drücken. Die Elastizität der Ringe wird berücksichtigt, so dass Biegung, Torsion und damit auch das Twisten abgebildet werden können. Nut- und Ringgeometrie sowie thermisch bedingte Verzüge fließen ebenfalls in die Berechnung mit ein. Als Ergebnisgrößen stehen neben den Ringbewegungen und -lagen auch die Gasströmungen und -drücke, Schmierfilmhöhen und Verlustleistungen zur Verfügung. Y1 - 2017 PB - FVV, Forschungsvereinigung Verbrennungskraftmaschinen CY - Frankfurt am Main ER - TY - GEN A1 - Zaussinger, Florian A1 - Haun, Peter A1 - Neben, Matthias A1 - Seelig, Torsten A1 - Travnikov, Vadim A1 - Egbers, Christoph A1 - Yoshikawa, Harunori A1 - Mutabazi, Innocent T1 - Dielectrically driven convection in spherical gap geometry T2 - Physical Review Fluids Y1 - 2018 U6 - https://doi.org/10.1103/PhysRevFluids.3.093501 SN - 2469-990X VL - 3 IS - 9 SP - 093501-1 EP - 093501-17 ER - TY - CHAP A1 - Zaussinger, Florian A1 - Haun, Peter A1 - Mutabazi, Innocent A1 - Egbers, Christoph T1 - Dielectrically driven thermal convection T2 - The 12th European Fluid Mechanics Conference, 9 September 2018 – 13 September 2018, Vienna, Austria Y1 - 2018 UR - http://info.tuwien.ac.at/efmc12/EFMC12_program_v3.2.pdf ER - TY - CHAP A1 - Zaussinger, Florian A1 - Egbers, Christoph A1 - Driebe, Thomas A1 - Heintzmann, Pascal A1 - Canfield, Peter A1 - Meier, Martin A1 - Travnikov, Vadim A1 - Froitzheim, Andreas A1 - Haun, Peter T1 - ATMOFLOW - Simulating atmosphere flows on the international space station. Part II: Experiments and numerical simulations T2 - 69th International Astronautical Congress, 1 - 5 October 2018, Bremen, Germany Y1 - 2018 UR - https://iafastro.directory/iac/paper/id/42847/abstract-pdf/IAC-18,A2,7,18,x42847.brief.pdf?2018-08-31.10:50:07 ER - TY - CHAP A1 - Zaussinger, Florian A1 - Egbers, Christoph A1 - Heintzmann, Pascal A1 - Canfield, Peter T1 - ATMOFLOW - Simulating atmosphere flows on the international space station. Part I: Experiment and implementation concept T2 - 69th International Astronautical Congress, 1 - 5 October 2018, Bremen, Germany Y1 - 2018 UR - https://iafastro.directory/iac/paper/id/44307/abstract-pdf/IAC-18,A2,6,15,x44307.brief.pdf?2018-03-29.10:03:31 ER - TY - GEN A1 - Zaussinger, Florian A1 - Kupka, Friedrich A1 - Montgomery, M. A1 - Egbers, Christoph T1 - Numerical simulation of DA white dwarf surface convection T2 - Journal of physics / Conference Series Y1 - 2018 U6 - https://doi.org/10.1088/1742-6596/1031/1/012013 SN - 1742-6596 SN - 1742-6588 VL - 1031 IS - 1 ER - TY - CHAP A1 - Zaussinger, Florian A1 - Haun, Peter A1 - Neben, Matthias A1 - Egbers, Christoph A1 - Mutabazi, Innocent T1 - Dielectrically driven convection in spherical gap geometry T2 - International Conference on Rayleigh Bénard Turbulence, May 14-18, 2018, Enschede, NL Y1 - 2018 UR - https://pof.tnw.utwente.nl/rbc2018/wp-content/uploads/2018/05/RBC2018_abstract_booklet.pdf ER - TY - GEN A1 - Kupka, Friedrich A1 - Zaussinger, Florian A1 - Montgomery, M. H. T1 - Mixing and overshooting in surface convection zones of DA white dwarfs: First results from ANTARES T2 - Monthly Notices of the Royal Astronomical Society Y1 - 2018 SN - 1365-2966 SN - 0035-8711 VL - 474 IS - 4 SP - 4660 EP - 4671 ER - TY - GEN A1 - Zaussinger, Florian T1 - A dynamic beam model for the motility of Listeria monocytogenes T2 - Acta Mechanica Y1 - 2018 U6 - https://doi.org/10.1007/s00707-018-2277-1 SN - 1619-6937 SN - 0001-5970 VL - 229 IS - 12 SP - 4927 EP - 4944 ER - TY - CHAP A1 - Egbers, Christoph A1 - Zaussinger, Florian A1 - Haun, Peter A1 - Canfield, Peter A1 - Travnikov, Vadim A1 - Froitzheim, Andreas T1 - Convection in the spherical gap under micro-gravity conditions: From Earth's mantle to atmospheric flows T2 - Book of Abstracts, 20th International Couette Taylor Workshop, July 11 - 13th, 2018 Marseille France Y1 - 2018 UR - https://ictw20.sciencesconf.org/data/pages/PROGRAM_ICTW20.pdf SP - 30 EP - 31 ER - TY - GEN A1 - Zaussinger, Florian A1 - Canfield, Peter A1 - Froitzheim, Andreas A1 - Travnikov, Vadim A1 - Haun, Peter A1 - Meier, Martin A1 - Meyer, Antoine A1 - Heintzmann, Pascal A1 - Driebe, Thomas A1 - Egbers, Christoph T1 - AtmoFlow - Investigation of Atmospheric-Like Fluid Flows Under Microgravity Conditions T2 - Microgravity Science and Technology : An International Journal for Microgravity and Space Exploration Related Research Y1 - 2019 UR - https://link.springer.com/article/10.1007/s12217-019-09717-7 UR - 1875-0494 UR - https://www-docs.b-tu.de/fg-aerodynamik-stroemungslehre/public/PDF/Pubs/ELGRA2019_Book-of-abstracts.pdf U6 - https://doi.org/10.1007/s12217-019-09717-7 SN - 0938-0108 SP - 1 EP - 19 PB - Springer ER - TY - GEN A1 - Zaussinger, Florian A1 - Egbers, Christoph A1 - Travnikov, Vadim A1 - Haun, Peter T1 - Influence of internal heating on convection in the rotating spherical gap T2 - 17th European Turbulence Conference, ETC 2019, September 3 - 6, 2019, Torino, Italy Y1 - 2019 UR - http://www.symposium.it/files/eventi/84/etc-2019-561.pdf CY - Turin ER - TY - GEN A1 - Szabo, Peter A1 - Zaussinger, Florian A1 - Haun, Peter A1 - Travnikov, Vadim A1 - Meier, Martin A1 - Egbers, Christoph T1 - Complementary numerical and experimental study in the baroclinic annulus for the microgravity experiment AtmoFlow T2 - EGU General Assembly 2020, EGU2020-20956, Online | 4–8 May 2020 Y1 - 2020 U6 - https://doi.org/10.5194/egusphere-egu2020-20956 ER - TY - GEN A1 - Travnikov, Vadim A1 - Zaussinger, Florian A1 - Haun, Peter A1 - Egbers, Christoph T1 - Influence of dielectrical heating on convective flow in a radial force field T2 - Physical Review E Y1 - 2020 U6 - https://doi.org/10.1103/PhysRevE.101.053106 SN - 2470-0053 SN - 2470-0045 VL - 101 IS - 5 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 - GEN A1 - Yoshikawa, Harunori A1 - Kang, Changwoo A1 - Mutabazi, Innocent A1 - Zaussinger, Florian A1 - Haun, Peter A1 - Egbers, Christoph T1 - Thermoelectrohydrodynamic convection in parallel plate capacitors under dielectric heating conditions T2 - Physical review fluids Y1 - 2020 U6 - https://doi.org/10.1103/PhysRevFluids.5.113503 SN - 2469-990X VL - 5 IS - 11 ER - TY - CHAP A1 - Erdogdu, Ahmed Oguzhan A1 - Szabo, Peter A1 - Carter, R. A1 - Gevre, M.-E. A1 - Haun, Peter A1 - Zaussinger, Florian A1 - Schulze, B. A1 - Meier, Martin A1 - Egbers, Christoph T1 - Verwendung der Wollaston-Scherinterferometrie zur Untersuchung des Brechungsindexgradienten in einem differentiell beheizten Ringspalt T2 - Experimentelle Strömungsmechanik : 28. Fachtagung, 7.-9. September 2021, Bremen T2 - Utilizing Wollaston shearing interferometry to investigate the refractive index gradient in a differentially heated annulus Y1 - 2021 SN - 978-3-9816764-7-1 SP - 19 PB - Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V. CY - Karlsruhe ER - TY - GEN A1 - Szabo, Peter A1 - Gaillard, Yann A1 - Haun, P. A1 - Carter, R. A1 - Adrian, A. A1 - Sliavin, Yaraslau A1 - Zaussinger, Florian A1 - Egbers, Christoph T1 - AtmoFlow - Investigating large scale convection in planetary atmospheres T2 - 27th European Low Gravity Research Association Biennial Symposium and General Y1 - 2022 UR - https://www.elgra2022.es/bookofabstractselgra2022 SP - 92 EP - 93 ER - TY - GEN A1 - Szabo, Peter A1 - Gaillard, Yann A1 - Zaussinger, Florian A1 - Egbers, Christoph T1 - Thermo-electrohydrodynamic convection in a differentially heated shell with electric central force field T2 - Proceedings in applied mathematics and mechanics : PAMM Y1 - 2023 U6 - https://doi.org/10.1002/pamm.202200121 SN - 1617-7061 N1 - 92nd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) VL - 23 IS - 1 ER -