Experimental and 3D numerical simulations of flow over a rounded edge-broad crested weir

The numerical investigation of flow over the models of hydraulic structures is an interesting method to estimate the flow parameters of a given geometry. It is a time-saving system and the most economical in terms of investigation cost and accuracy of results. The design and simulation of flow over various shapes of models are economic and reliable in numerical simulation. Twelve experiments were conducted on wide dam models with rounded edges of different lengths and heights. The experiments were carried out in a channel of dimensions (50 * 50) cm and length of 12 m. the same laboratory experiments were carried out using computational fluid dynamics for Flow 3D program. The free surface profile was determined and a pressure distribution profile was included which shows that the hydrostatic pressure over the broad crested weir and the highest pressure in the upstream region was the computational inferences in close agreement with the experimental data. Compared with the upstream depth, the highest relative error of upstream water depth (y1) was 3.07%. It also shows through experimental and numerical experiments the head over broad is inversely proportional to the height of the weir and positivly to the length of the weir.