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

TL;DR

This study investigates how rough walls influence the hydrodynamic forces on an ellipsoidal particle in shear flow through detailed 3D simulations, providing correlations for drag, lift, and torque coefficients.

Contribution

It introduces new correlations for hydrodynamic coefficients that account for wall roughness, particle orientation, and Reynolds number effects in shear flow.

Findings

Rough wall significantly alters drag, lift, and torque on the particle.

Developed correlations accurately predict force coefficients across parameter ranges.

Simulation data covers a wide range of shear Reynolds numbers and orientations.

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 %(approximately 2400) over a range of parameters such as shear Reynolds number ($10 \le Re_s \le 100$), orientation angle ($0\le\theta\le 180$), and wall-particle separation distance ($0.1\le\delta\le2.0$) 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.