Author(s): Gregor Petkovsek; Rudi Rajar; Matjar Cetina; Dusan Zagar
Linked Author(s): Dusan Zagar
Keywords: No Keywords
Abstract: Smoothed particle hydrodynamics (SPH), a meshless particle method, is especially suitable for simulating flows with rapid changes, such as instantaneous channel expansions. The Tis Isat model, developed at the University of Ljubljana, is based on this numerical technique. This study presents the results of simulations of dam break flow in rectangular channels with various expansion ratios. Laboratory experiments of Rajar (1972) and Popovska (1988) were used for calibration and validation of the Tis Isat model. Several setups were simulated, with different ratios of base width to expanded width, and some with a contraction prior to expansion. Both dry and wet initial bottom were tested. The results of the Tis Isat model were also compared to numerical results of 1-D and 2-D finite difference models. The results generally show good agreement, in particular the surge front propagation, while the agreement of the flow profile still needs to be improved.