Experimental and Numerical Modeling of Flow in a Stilling Basin.

José Carlos Amorim, Victor Dobrochisnki Barbosa, Renata Cavalcanti Rodrigues Amante

Tuesday 30 june 2015

17:54 - 17:57h at Europe 1 & 2 (level 0)

Themes: (T) Water engineering, (ST) Computational methods, Poster pitches

Parallel session: Poster pitches: 7E. Engineering - Computional

Stilling basins are very important for the safety of large hydraulic works, as hydroelectric projects, preventing erosions downstream the dam that could even risk its stability. They accomplish the dissipation of the energy contained in the flow that originates in the spillway and that returns to the water flow. The present work presents a numerical and experimental study of the turbulent flow in a hydraulic jump stilling basin. In its development, a physical model and a numerical model based on CFD techniques that describe the behavior of turbulent free surface flow were used. The objective of the study is to determine the characteristics of the turbulent flow in stilling basins, aiming to obtain the interaction between the physical model and the numerical one, through the comparison of the data obtained. In addition, the behavior of the flow inside of a stilling basin is described, focusing the free surface profile, the predictions of the velocities and of the instantaneous and mean pressures in determined points of the flow, and the hydraulic efficiency, using the CDF modeling techniques. The numerical model, based on finite difference method, uses the FAVOR method in order to define solid obstacle geometry and the VOF method to represent free surfaces. A k-_ turbulence model is used to predict the turbulence characteristics. The physical model used, constructed in the Experimental Hydraulics Laboratory of Furnas S.A. (LAHE), reproduce the geometry of the Hydropower Plant (HPP) of Porto Colombia. The three-dimensional model has a geometric scale of 1:100. Aligning the physical and the numerical modeling, an important analysis of all operations conditions is possible; bringing then, a great facility for the study of other structures configurations and, a wide knowledge of the fluid dynamics.