Lift and drag forces acting on a particle moving in the presence of slip and shear near a wall

Abstract

The lift and drag forces acting on a small spherical particle moving with a finite slip in single-wall-bounded flows are investigated via direct numerical simulations. This study is an extension of our previous work that considered the lift and drag forces acting on a sphere moving near a wall in the presence shear, but in the absence of slip (Ekanayake et al., J. Fluid Mech., vol. 904, 2020, A6). The effect of slip velocity on the particle force is analysed as a function of separation distance for low slip and shear Reynolds numbers (and) in both quiescent and linear shear flows. A generalised lift model valid for arbitrary particle-wall separation distances and is developed based on the re..