I'm modelling a tidal harbour in Ansys Fluent and want to include a turbulence model in my simulation. I want to predict the water movements around a pontoon which is situated in the harbour. Which turbulence model should I use, a $k$-$\varepsilon$ model or a $k$-$\omega$ model?
The harbour is modelled as a rectangular ($120\times 80\times 6$ m LxWxH) box and the water flows in through an entrance channel ($40 \times 10 \times 6$ m). To simulation flow around a pontoon, a rectangular box ($40\times 3\times 5$ m) is placed at the long side of the harbour and water can flow around an underneath the pontoon. Velocities are 0.3 m/s and lower.