Commun. Comput. Phys., 11 (2012), pp. 1311-1322. Statistics of Particle Suspensions in Turbulent Channel Flow Lihao Zhao 1*, Helge I. Andersson 11 Fluids Engineering Division, Department of Energy and Process Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway. Received 15 May 2010; Accepted (in revised version) 15 May 2011 Available online 30 November 2011 doi:10.4208/cicp.080510.150511s Abstract Particle dynamics in a turbulent channel flow is considered. The effects of particle concentration and Reynolds number on the particle velocity statistics are investigated. Four different particle response times, $\tau^{+}$=1, 5, 30 and 100, are examined for three different Reynolds numbers, $Re_{*}$=200, 360 and 790 (based on channel height and friction velocity). The particle concentration evolves with time and statistics obtained during three different sampling periods might be distinctly different. The mean and fluctuating particle velocities are substantially affected both by the particle response time and by the Reynolds number of the flow. AMS subject classifications: 76T15, 76F10, 76F65 Notice: Undefined variable: pac in /var/www/html/issue/abstract/readabs.php on line 164 Key words: Spherical particles, DNS, turbulence, sampling, Reynolds number effects. *Corresponding author. Email: lihao.zhao@ntnu.no (L. H. Zhao), helge.i.andersson@ntnu.no (H. I. Andersson)