Reynolds stress turbulence modelling of surf zone breaking waves

Computational fluid dynamics is increasingly used to investigate the inherently complicated phenomenon of wave breaking. To date, however, no single model has proved capable accurately simulating breaking process across entirety surf zone for both spilling and plunging breakers. The present study newly considers Reynolds stress– $\omega$ turbulence closure this purpose, where specific dissipation rate. Novel stability analysis proves that, unlike two-equation closures (at least in their standard forms), neutrally stable idealized potential flow region beneath surface waves. It thus naturally avoids unphysical exponential growth prior breaking, which plagued numerous studies. confirmed through simulation a progressive train. then applied simulate turbulent boundary layer, demonstrating superior accuracy relative model, especially during deceleration. Finally, employed waves, with seemingly unprecedented accuracy. Specifically, work marks first time that collectively: (1) over-production (2) predicts point, (3) provides reasonable evolution normal stresses, while also (4) yielding accurate undertow velocity structure magnitude zone, cases. Differences predicted shear stresses (hence resistance) are identified as key improved inner performance, state-of-the-art model.