### 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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Publication status | Published - 2010 |

Event | conference; Lecture given at: Contactgroep Turbulentie, TU-Delft; 2010-10-04; 2010-10-04 - Duration: 4 Oct 2010 → 4 Oct 2010 |

### Conference

Conference | conference; Lecture given at: Contactgroep Turbulentie, TU-Delft; 2010-10-04; 2010-10-04 |
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Period | 4/10/10 → 4/10/10 |

Other | Lecture given at: Contactgroep Turbulentie, TU-Delft |

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## Cite this

Vreman, A. W., Geurts, B. J., Deen, N. G., & Kuipers, J. A. M. (2010).

*LES of a particle-laden turbulent channel flow*. conference; Lecture given at: Contactgroep Turbulentie, TU-Delft; 2010-10-04; 2010-10-04, .