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This paper compares the Wolf method to the shifted forces (SF) method forefficient computer simulation of isotropic systems interacting via Coulombforces, taking results from the Ewald summation method as representing the truebehavior. We find that for the Hansen-McDonald molten salt model the SFapproximation overall reproduces the structural and dynamical properties asaccurately as does the Wolf method. It is shown that the optimal Wolf dampingparameter depends on the property in focus, and that neither the potentialenergy nor the radial distribution function are useful measures for theconvergence of theWolf method to the Ewald summation method. The SFapproximation is also tested for the SPC/Fw model of liquid water at roomtemperature, showing good agreement with both the Wolf and the particle meshEwald methods; this confirms previous findings [Fennell & Gezelter, J. Chem.Phys. {\bf 124}, 234104 (2006)]. Beside its conceptualsimplicity the SFapproximation implies a speed-up of a factor 2 to 3 compared to the Wolf method(which is in turn much faster than the Ewald method).

Simplistic Coulomb forces in molecular dynamics: Comparing the Wolf and shifted-force approximations