Abstract
Large-eddy simulations of a vertical turbulent channel flow with 420,000 solid particles are performed in order to get insight into fundamental aspects of a riser flow The question is addressed whether collisions between particles are important for the ow statistics. The turbulent channel ow corresponds to a particle volume fraction of 0.013 and a mass load ratio of 18, values that are relatively high compared to recent literature on large-eddy simulation of two-phase ows. In order to simulate this ow, we present a formulation of the equations for compressible ow in a porous medium including particle forces. These equations are solved with LES using a Taylor approximation of the dynamic subgrid-model. The results show that due to particle-uid interactions the boundary layer becomes thinner, leading to a higher skin-friction coefcient. Important effects of the particle collisions are also observed, on the mean uid prole, but even more o on particle properties. The collisions cause a less uniform particle concentration
and considerably atten the mean solids velocity prole.
Original language | English |
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Title of host publication | Direct and Large-Eddy Simulation V |
Subtitle of host publication | Proceedings of the fifth international ERCOFTAC Workshop on Direct and Large-Eddy Simulation held at the Munich University of Technology, August 27–29, 2003 |
Editors | Rainer Friedrich, Bernard J. Geurts, Olivier Métais |
Place of Publication | Dordrecht |
Publisher | Kluwer Academic |
Pages | 271-278 |
ISBN (Electronic) | 978-1-4020-2313-2 |
ISBN (Print) | 978-90-481-6575-9 |
DOIs | |
Publication status | Published - 2003 |
Event | 5th ERCOFTAC Workshop on Direct and Large-Eddy Simulation V, DLES 2003 - Munich University of Technology, Munich, Germany Duration: 27 Aug 2003 → 29 Aug 2003 Conference number: 5 |
Publication series
Name | ERCOFTAC series |
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Publisher | Kluwer Academic |
Volume | 9 |
ISSN (Print) | 1382-4309 |
Conference
Conference | 5th ERCOFTAC Workshop on Direct and Large-Eddy Simulation V, DLES 2003 |
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Abbreviated title | DLES |
Country/Territory | Germany |
City | Munich |
Period | 27/08/03 → 29/08/03 |
Keywords
- Large-Eddy simulation
- Turbulence
- Two-phase flow