A numerical model was developed based upon the Cubic-Interpolated Pseudo-particle (CIP) Combined Unified Procedure (CIP-CUP or C-CUP) method equipped with a Large Eddy Simulation (LES) model and a re-initialisation method. The model was validated and applied to the laminar dam-break flow problem, the turbulent dam-break flow problem and the tidal bore flow with a weak breaking front. In the laminar dam break flow problem the model resolved the free surface profiles, and the flow calculations were in good agreement with the experiment studies of Martin and Moyce (1952) and the experimental and numerical test of Koshizuka et al. (1995) and Koshizuka and Oka (1996). In the turbulent dam break flow problem, the model included a LES turbulence model and it was applied to a dam break wave in a relatively long channel. The shape of the leading edge was compared with the experimental studies, e.g. Dressler (1952, 1954); Cavaille (1965) and theoretical studies, e.g. Chanson (2005, 2006). In the tidal bore flow with a weak breaking front, the model equipped with a LES turbulence model reproduced accurately the large deformation of the free surface immediately after gate closure and the bore generation. The free-surface profile and surge front celerity data were in good agreement with the experimental data of Koch and Chanson (2005). At a fixed sampling location, the numerical results showed the existence of some short-lived flow reversal next to the bed immediately after the bore front passage. This flow feature was documented by Koch and Chanson (2005) and Chanson (2007). By applying the method to these complex flows, it was shown that the numerical technique was effective for the analysis of various flows in civil engineering applications.
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