Influence of Particle-Wall Interaction Modeling on Particle Dynamics in Near-Wall Regions of Turbulent Channel Down-Flow

摘要

Particle-laden channel flows are found in a variety of natural settings and are also of great practical importance due to their frequent occurrence in engineering applications. Numerous experimental and computational studies related to particle transport in turbulent flows were reported in the literature. There have been a few applications of Direct Numerical Simulations to particle-laden channel flows, such as in [7] and [9]. Those studies necessarily focus on rather low Reynolds numbers. Kulick et al. [6] reported results of experiments on particle-laden flows in a vertical channel down-flow at Re_τ ≈ 644 (based on friction velocity and channel half-width). Large-Eddy Simulation results for a channel flow at approximately the same Reynolds number are also available, e.g. [4]. In the present study, a vertical turbulent channel flow (with gravity pointing in the mean flow direction) at Reynolds number Re_τ ≈ 210 is investigated by means of DNS. The aim is to study the influence of wall-particle interactions on the particle statistics.