DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf
ISBN Print: 978-1-56700-229-4
ISSN: 2377-2816
On the motion of ellipsoidal particles suspended in a turbulent channel flow
摘要
A direct numerical simulation of ellipsoidal and spherical particles suspended in a turbulent channel flow is presented. The fluid equations of motion are solved numerically at a Reynolds number of 180, based on the channel half height and friction velocity. A Lagrangian description is used to track the particle paths. The particles are subjected to drag force, lift force and torque, valid for creeping flow conditions. The four Euler parameters are used for the time evolution of the particle orientation. Results show that the particles accumulate in the near wall region. In this region, particles have larger streamwise intensity. This is possibly a result of particles carrying larger sreamwise momentum toward the wall. The particles have lower spanwise and wall-normal intensities, as compared to the fluid. Also, in the lower wall region, the particles experience positive drag and negative lift forces, which may explain why particles accumulate in the wall region.