 |
| Titel |
Direct numerical simulation of intermittent turbulence under stably stratified conditions |
| VerfasserIn |
P. He, S. Basu |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 22, no. 4 ; Nr. 22, no. 4 (2015-07-31), S.447-471 |
| Datensatznummer |
250120993
|
| Publikation (Nr.) |
 copernicus.org/npg-22-447-2015.pdf |
|
|
|
|
|
| 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 spatiotemporal 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. Lastly, a long standing
hypothesis by Blackadar (1979), i.e., the strong connection between local stability
and intermittent turbulence, is corroborated by this modeling study. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|