Drag, lift, and torque on a near-wall oblate spheroid in linear shear flow

This study performs particle resolved simulations (PRSs) to investigate the behavior of linear shear flow over a near-wall oblate spheroidal particle. Simulations are conducted for particles with aspect ratios ( lambda) of 1.5, 2, and 4, covering Reynolds numbers ( Re) ranging from 1 to 200 and particle inclination angles ( theta) from 0 degrees to 180 degrees. The resulting drag, lift, and torque coefficients exhibit unique patterns of variation with respect to theta, showing significant differences compared to particles in unbounded uniform flow. These variations are elucidated by examining the flow field surrounding the particle, alongside the distribution of pressure and skin-friction coefficients on its surface. Based on these findings, correlations for the drag, lift, and torque coefficients are proposed, demonstrating strong agreement with the PRS results across different aspect ratios and Reynolds numbers, thereby providing accurate predictive models for near-wall oblate spheroidal particles in linear shear flow.