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| Titel |
GEOFLOW: simulation of convection in a spherical shell under central force field |
| VerfasserIn |
P. Beltrame, V. Travnikov, M. Gellert, C. Egbers |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 13, no. 4 ; Nr. 13, no. 4 (2006-08-15), S.413-423 |
| Datensatznummer |
250011811
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| Publikation (Nr.) |
 copernicus.org/npg-13-413-2006.pdf |
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| Zusammenfassung |
| Time-dependent dynamical simulations related to convective motion in a spherical gap under a
central force field due to the dielectrophoretic effect are discussed. This work is part of
the preparation of the GEOFLOW-experiment which is planned to run in a microgravity
environment. The goal of this experiment is the simulation of large-scale convective motion in
a geophysical or astrophysical framework. This problem is new because of, on
the one hand, the nature of the force field (dielectrophoretic effect) and, on another hand,
the high degree of symmetries of the system, e.g. the top-bottom reflection. Thus, the
validation of this simulation with well-known results is not possible. The questions
concerning the influence of the dielectrophoretic force and the possibility to reproduce the
theoretically expected motions in the astrophysical framework, are open. In the first part, we
study the system in terrestrial conditions: the unidirectional Earth's force is superimposed
on the central dielectrophoretic force field to compare with the
laboratory experiments during the development of the equipment. In the second part, the GEOFLOW-experiment simulations in weightless conditions
are compared with theoretical studies in the astrophysical framework's, in the first instance
a fluid under a self-gravitating force field. We present complex time-dependent dynamics,
where the dielectrophoretic force field causes significant differences in the flow compared to
the case that does not involve this force field. |
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