  This paper presents novel correlations to predict the drag, lift, and torque
coefficients of axi-symmetric non-spherical rod-like particles in a
wall-bounded linear shear flow. The particle position and orientation relative
to the wall are varied to systematically investigate the influence of the wall
on the hydrodynamic forces. The newly derived correlations for drag, lift, and
torque on the particle depend on various parameters, including the particle
Reynolds number, the orientation angle between the major axis of the particle
and the main local flow direction, the aspect ratio of the particle, and the
dimensionless distance from the particle centre to the wall. The coefficients
of the correlations are determined through a fitting process utilizing the data
generated from our previous study on the interaction forces between a locally
uniform flow and an axi-symmetric non-spherical rod-like particles, as well as
from data of novel direct numerical simulations (DNS) performed in this work of
flow past axi-symmetric rod-like particles near a wall. The proposed
correlations exhibit a good agreement compared to the DNS results, with median
errors of 2.89%, 5.37%, and 11.00%, and correlation coefficients of 0.99, 0.99,
and 0.96 for the correlations accounting for changes in drag, lift, and torque
coefficients due to the wall-bounded linear shear flow profile, respectively.
These correlations can be used in large-scale simulations using an
Eulerian-Lagrangian or a CFD/DEM framework to predict the behaviour of
axi-symmetric rod-like non-spherical particles in wall-bounded flows, shear
flows, as well as uniform flows.
