Effect of rough wall on drag, lift, and torque on an ellipsoidal particle in a linear shear flow

Abstract

The present study provides a detailed description of the forces on an ellipsoidal particle in the vicinity of the rough wall. Three-dimensional numerical simulations are performed using body-fitted mesh to estimate the drag, lift, and torque coefficients. A large number of simulations are conducted over a range of parameters such as shear Reynolds number (10 {less than or equal to}Res{less than or equal to}100), orientation angle (0{degree sign}{less than or equal to}θ {less than or equal to}180), and wall-particle separation (0.1 {less than or equal to}δ {less than or equal to} 2.0) to get a comprehensive description of variation of the above coefficients. Using the simulation results, we develop the correlations for the drag and lift coefficients to describe the effect of rough wall, inclination angles, and particle Reynolds numbers on the hydrodynamic coefficients. The proposed correlations can be used for two phase flow simulation using Eulerian-Lagrangian framework.

Characteristics of a Particle’s Incipient Motion from a Rough Wall in Shear Flow of Herschel–Bulkley Fluid

“…In [18], a simulation of the flow of an ellipsoidal particle in a shear flow of Newtonian fluid over a surface of hemispheres was performed. The coefficients of the drag and lift forces and the torque as a function of the shear Reynolds number, ellipsoid orientation angle, and distance from the surface were determined.…”