LES of particle-laden turbulent channel flow with transverse roughness elements on one wall

Abstract

The effect of wall roughness on the transport of solid particles in a turbulent channel flow is numerically investigated by means of large eddy simulation coupled with a Lagrangian particle-tracking scheme. Two-dimensional transverse square elements separated by a rectangular cavity are placed on the lower wall of the channel. Results were obtained for several values of the cavity width to the roughness height ratio. It is shown that the deposition of particles, as well as the particle accumulation near the walls, and their tendency to preferentially concentrate in flow regions of low streamwise fluid velocity are significantly affected by the roughness elements. © 2009 American Institute of Physics.