The present study formally proved that Reynolds stress models (RSMs) are unconditionally stable in the potential flow regions. RSMs resolve all components of the Reynolds stress, eliminating e.g. the assumed isotropy of turbulence inherent within two-equation models. The present study implemented and applied Wilcox stress-omega turbulence model for simulating breaking waves. It shows that the Wilcox stress-omega turbulence model can predict accurate results from pre-breaking all the way into the inner surf zone, especially for the undertow velocity profiles in the inner surf zone, which even stabilized two-equation models fails to accurately predict.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/hZqqlGbHpkA