  The Orbital-Motion-Limited (OML) theory has been modified to predict the dust
charge and the results were contrasted with the Whipple approximation [Tang and
Delzanno, Phys. Plasmas 21, 123708 (2014)]. To further establish its regime of
applicability, in this paper the OML predictions (for a non-electron-emitting,
spherical dust grain at rest in a collisionless, unmagnetized plasma) are
compared with Particle-In-Cell simulations that retain the absorption radius
effect. It is found that for large dust grain radius $r_d$ relative to the
plasma Debye length $\lambda_D$, the revised OML theory remains a very good
approximation as, for the parameters considered ($r_d/\lambda_D\le10$, equal
electron and ion temperatures), it yields the dust charge to within $20\%$
accuracy. This is a substantial improvement over the Whipple approximation. The
dust collected currents and energy fluxes, which remain the same in the revised
and standard OML theories, are accurate to within $15-30\%$.
