LES-DPS of the effect of wall roughness on dispersed-phase transport in particle-laden turbulent channel flow

Kyle Squires, Olivier Simonin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The influence of wall roughness on the properties of particle-laden turbulent channel flow is investigated using Large Eddy Simulation (LES) for the fluid and Discrete Particle Simulation (DPS) for the particulate phase. The influence of wall roughness is treated stochastically following the approach of Sommerfeld (1992) in which the impact angle of the particle is comprised of the particle trajectory angle and a stochastic component due to wall roughness. Particle-wall collisions are elastic and for each of the three Stokes numbers considered computations are performed with standard deviation of the distribution of "wall roughness angles" of 0 (smooth wall), 2.5 and 5 degrees. Simulation results show that for a given wall roughness angle and particle Stokes number the most pronounced effect of roughness is on the wall-normal component of the particle velocity, which can be substantially increased by roughness. While the streamwise particle velocity variance is also increased by roughness, the spanwise component of the particle velocity variance exhibits relatively little sensitivity to surface roughness. Turbulent transport of the particle velocity variance can be strongly affected by roughness and can also provide a mechanism for transport of the particle velocity variance across the channel.

Original languageEnglish (US)
Title of host publication4th International Symposium on Turbulence and Shear Flow Phenomena
Pages195-200
Number of pages6
Volume1
StatePublished - 2005
Event4th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 4 - Williamsburg, VA, United States
Duration: Jun 27 2005Jun 29 2005

Other

Other4th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 4
CountryUnited States
CityWilliamsburg, VA
Period6/27/056/29/05

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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    Squires, K., & Simonin, O. (2005). LES-DPS of the effect of wall roughness on dispersed-phase transport in particle-laden turbulent channel flow. In 4th International Symposium on Turbulence and Shear Flow Phenomena (Vol. 1, pp. 195-200)