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| Titel |
Numerical and laboratory experiment of volumetrically heated fluid: implications of boundary conditions on planetary evolution. |
| VerfasserIn |
Kenny Vilella, Angela Limare, Edouard Kaminski, Cinzia G. Farnetani, Claude Jaupart, Emanoil Surducan, Erika Di Giuseppe, Vasile Surducan, Camelia Neamtu, Loic Fourel |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250095563
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| Publikation (Nr.) |
 EGU/EGU2014-11022.pdf |
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| Zusammenfassung |
| In the last decade numerical simulations of mantle convection have included an increasing
number of physical processes (e.g., phase transitions, compositional heterogeneities, depth
dependent properties), to gain a better understanding of the Earth’s thermal evolution. This
increasing complexity has led to a more precise description of the convective behavior of the
Earth’s mantle, but may have render its deciphering somewhat more difficult and sometimes
ambiguous. Coupled experimental and numerical studies are then useful to interpret the
results of the modeling. Here we present numerical simulations of a simple system,
which is only cooled from above and internally heated, coupled with innovative
laboratory experiments. Three-dimensional simulations are conducted with the
code Stag3D [Tackley 1993], and the laboratory experiments used a newtonian
fluid whose viscosity and thermal expansion are both temperature dependent. The
experimental approach, presented in detail in a companion abstract by Limare at al.
(EGU2014-6207), is very challenging and it was first important to validate numerically
the experimentally measured temperature and velocity fields. We then used the
combined approach to quantify the effect of boundary conditions (i.e., rigid, as in
the laboratory experiments, or free slip) on the internal thermal structure of the
convective fluid. In particular, we calculate the horizontally and time-averaged
temperature across the top thermal boundary layer for a large range of Rayleigh number
(105 |
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