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Colloidal systems are often modelled as fluids of hard particles (possiblywith an additional soft attraction, e.g. caused by polymers also contained inthe suspension). in simulations of such systems, the virial theorem cannot bestraightforwardly applied to obtain the components of the pressure tensor. Insystems confined by walls, it is hence also not straightforward to extract theexcess energy due to the wall (the "wall tension") from the pressure tensoranisotropy. A comparative evaluation of several methods to circumvent thisproblem is presented, using as examples fluids of hard spheres and theAsakura-Oosawa model of colloid-polymer mixtures with a size ratio $q=0.15$(for which the effect of the polymers can be integrated out to yield aneffective attractive potential between the colloids). Factors limiting theaccuracy of the various methods are carefully discussed, and controlling thesefactors very good mutual agreement between the various methods is found.

Methods to Compute Pressure and Wall Tension in Fluids containing Hard Particles