Abstract
Large-eddy simulation of complex turbulent flows involves the filtering and modelling of small scale flow structures whose intensity shows large spatial variations in the fl.ow domain. This suggests the use of filters with nonuniform filterwidth. Such filters fail to commute with spatial derivatives and give rise to additional 'noncommutation' terms in LES. We construct higher order filters and show that the subgrid terms and the new noncommutation terms are a priori of comparable magnitude. We apply these filters to DNS data of the temporal mixing layer. The magnitude of the noncommutation terms and their contribution to the kinetic energy dynamics is determined. Finally, we show that LES predictions significantly depend on the specific explicit filter used in dynamic subgrid modelling.
Original language | English |
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Title of host publication | Direct and Large-Eddy Simulation II |
Subtitle of host publication | Proceedings of the ERCOFTAC Workshop held in Grenoble, France, 16–19 September 1996 |
Editors | Jean-Pierre Chollet, Peter R. Voke, Leonhard Kleiser |
Place of Publication | Dordrecht |
Publisher | Kluwer Academic Services |
Pages | 47-56 |
Number of pages | 10 |
ISBN (Electronic) | 978-94-011-5624-0 |
ISBN (Print) | 978-94-010-6370-8 |
DOIs | |
Publication status | Published - 1997 |
Event | 2nd ERCOFTAC Workshop on Direct and Large-Eddy Simulation II 1996 - Grenoble, France Duration: 16 Sept 1996 → 19 Sept 1996 Conference number: 2 |
Publication series
Name | ERCOFTAC Series |
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Publisher | Springer |
Volume | 5 |
ISSN (Print) | 1382-4309 |
Conference
Conference | 2nd ERCOFTAC Workshop on Direct and Large-Eddy Simulation II 1996 |
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Country/Territory | France |
City | Grenoble |
Period | 16/09/96 → 19/09/96 |
Keywords
- Large eddy simulation
- Order filter
- Direct numerical simulation data
- High order filter
- Complex turbulent flow