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

Comparison of dust charging between Orbital-Motion-Limited theory and Particle-In-Cell simulations