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| Titel |
Numerical simulation of helical-vortex effects in Rayleigh-Bénard convection |
| VerfasserIn |
G. V. Levina, I. A. Burylov |
| 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. 2 ; Nr. 13, no. 2 (2006-06-21), S.205-222 |
| Datensatznummer |
250011733
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| Publikation (Nr.) |
 copernicus.org/npg-13-205-2006.pdf |
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| Zusammenfassung |
| A numerical approach is substantiated for searching for the
large-scale alpha-like instability in thermoconvective turbulence.
The main idea of the search strategy is the application of a
forcing function which can have a physical interpretation. The
forcing simulates the influence of small-scale helical turbulence
generated in a rotating fluid with internal heat sources and is
applied to naturally induced fully developed convective flows. The
strategy is tested using the Rayleigh-Bénard convection in an
extended horizontal layer of incompressible fluid heated from
below. The most important finding is an enlargement of the typical
horizontal scale of the forming helical convective structures
accompanied by a cells merging, an essential increase in the
kinetic energy of flows and intensification of heat transfer. The
results of modeling allow explaining how the helical feedback can
work providing the non-zero mean helicity generation and the
mutual intensification of horizontal and vertical circulation, and
demonstrate how the energy of the additional helical source can be
effectively converted into the energy of intensive large-scale
vortex flow. |
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