In the framework of improvement of cavity electropolishing, modelling permits to evaluate some parameters not easily
accessible by experiments and can also help us to guide them. Different laboratories (DESY, Fermilab) work on electro
or chemical polishing modelling with different approaches and softwares. At CEA Saclay, COMSOL software is used to
model horizontal electropolishing of cavity in two dimensions. The goal of this study has been motivated by improvement
of our electropolishing setup by modifying the arrival of the acid. The influence of a protuberant cathode has been evaluated
and compared for different shapes of single cell cavities: TESLA, ILC Low Loss (LLILC), and ILC Reentrant (REILC).
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