Direct numerical simulation of a particle-laden flow in a flat plate boundary layer. (March 2016)

• Record Type: Journal Article
• Authors: Li, Dong; Wei, Anyang; Luo, Kun; Fan, Jianren
• Is Part Of: International journal of multiphase flow. Volume 79(2016)
• Page Start: 124
• Page End: 143
• Publication Date: 2016-03
• Subjects: Flat plate boundary layer -- Particle-laden flow -- Two-way coupling -- Direct numerical simulation; Multiphase flow -- Periodicals; Écoulement polyphasique -- Périodiques; Multiphase flow; Periodicals; 620.1064
• DOI: 10.1016/j.ijmultiphaseflow.2015.10.011
• Languages: English
• ISSNs: 0301-9322

Abstract

Highlights: A direct numerical simulation of particle-laden flow is performed. The inertial particles displace the quasi-streamwise vortices towards the wall. The particles increase the mean skin-friction coefficient. The particles augment the streamwise fluctuating velocity in the near-wall region. The wall-normal and spanwise velocity fluctuations are significantly damped. Abstract: In this paper, a direct numerical simulation of particle-laden flow in a flat plate boundary layer is performed, using the Eulerian–Lagrangian point-particle approach. This is, as far as we know, the first simulation of a particle-laden spatially-developing turbulent boundary layer with two-way coupling. A local minimum of the particle number density is observed in the close vicinity of the wall. The present simulation results indicate that the inertial particles displace the quasi-streamwise vortices towards the wall, which, in turn, enhance the mean streamwise fluid velocity. As a result, the skin-friction coefficient is increased whereas the boundary layer integral thicknesses are reduced. The presence of particles augments the streamwise fluctuating velocity in the near-wall region but attenuates it in the outer layer. Nevertheless, the wall-normal and spanwise velocity fluctuations are significantly damped, and so is the Reynolds stress. In addition, the combined effect of a reduced energy production and an increased viscous dissipation leads to the attenuation of the turbulent kinetic energy. Graphical abstract: