Symbol	Parameter Name
$V$	Fluid velocity
$u$	Fluid velocity component parallel to the wall
${\upsilon }_n$	Fluid velocity component normal to the wall
p	Pressure
$\upsilon$	Kinematic viscosity
${\delta }_{ij}$	Kronecker delta symbol
k	Specific turbulent energy
$F_{st}$	Sticking force
$F_D$	Drag force
$F_L$	Lift force
$a$	Deformation of the particle along the surface
$d_p$	Particle diameter
$v_n$	Normal (impact) velocity
$v_{cr}$	Critical (capture) velocity
$u^{*}$	Wall shear velocity
$u_R{}^{*}$	Wall shear velocity for rolling
$u_s{}^{*}$	Wall shear velocity for sliding
$d_s$	Distance of the first grid point from the wall
$C_D$	Drag coefficient
${\mathrm{Re}}_p$	Reynolds coefficient
Kc	Composite Young’s modulus
$E_s$	Young’s modulus for surface
$E_p$	Young’s modulus for particle
$W_A$	Work of adhesion
$v_s$	Poisson’s ratio for surface
$v_p$	Poisson’s ratio for particle
${\rho }_p$	Particle density
${\rho }_M$	Mixture density
$\rho$	Air density (at 1013.25 hPa (abs) and 15 °C)
$\mu$	Dynamic viscosity of fluid (air)
$f$	Correction factor for the near wall
$C_u$	Cunningham correction factor
$k_s$	Static coefficient of friction