Water model. A water model is defined by its geometry, together with other parameters such as the atomic charges and Lennard-Jones parameters.
An alternative to the explicit water models is to use an implicit solvation model, also known as a continuum model, an example of which would be the COSMO Solvation Model or the Polarizable continuum model (PCM). Simple water models[edit] Water models. October 2005: Revealing the Mysteries of Water.