Abstract
DNS and LES of particle-laden turbulent channel flow, in which the particles experience a drag force, are performed. Simulations at three di®erent Stokes numbers andfor two different subgrid models are carried out. In this flow turbophoresis leads to anaccumulation of particles near the walls. It is shown that the turbophoresis and particle dispersion in LES are reduced, if the filtered fluid velocity is used in the particle equation of motion. This is a combined effect of the disregard of the subgrid scales in the fluid velocity and of the inadequacy of the subgrid model in the fluid equations. To alleviate this problem an inverse filtering model is proposed and incorporated into the particle equations. The model is shown to enhance turbophoresis and particle dispersion in actual LES. For the dynamic eddy-viscosity model this results in a good agreement with the DNS-predictions.
| Original language | English |
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| Title of host publication | Proceedings of the 11th Workshop on Two-Phase Flow Predictions : Merseburg, April 5 - 8, 2005 |
| Editors | M. Sommerfeld |
| Place of Publication | Halle |
| Publisher | Martin-Luther-Universität Halle-Wittenberg |
| Pages | 1-15 |
| ISBN (Print) | 3-86010-767-4 |
| Publication status | Published - 2005 |
| Event | 11th Workshop on Two-Phase Flow Predictions, April 5-8, 2005, Merseburg - Duration: 5 Apr 2005 → 8 Apr 2005 |
Workshop
| Workshop | 11th Workshop on Two-Phase Flow Predictions, April 5-8, 2005, Merseburg |
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| Period | 5/04/05 → 8/04/05 |