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| Titel |
Direct numerical simulation of intermittent turbulence under stably stratified conditions |
| VerfasserIn |
P. He, S. Basu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 2, no. 1 ; Nr. 2, no. 1 (2015-02-11), S.179-241 |
| Datensatznummer |
250115147
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| Publikation (Nr.) |
 copernicus.org/npgd-2-179-2015.pdf |
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| Zusammenfassung |
| In this paper, we simulate intermittent turbulence (also known as
bursting events) in stably stratified open-channel flows using
direct numerical simulation. Clear signatures of this intriguing
phenomenon are observed for a range of stabilities. However, the
spatio-temporal characteristics of intermittency are found to be
strongly stability-dependent. In general, the bursting events are
much more frequent near the bottom wall than in the upper-channel
region. A steady coexistence of laminar and turbulent flows is
detected at various horizontal planes in very stable cases. This
spatially intermittent pattern is found to propagate downstream and
strongly correlate with the temporal evolution of
intermittency. Last, a long standing hypothesis by Blackadar, i.e.,
the strong connection between local stability and intermittent
turbulence, is corroborated by this modeling study. |
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