Author(s): Luis G. Castillo; Jose M. Carrillo
Keywords: No Keywords
Abstract: The energy dissipation in plunge pools are produced principally by turbulence generation. In fall jets and in dissipation basins appear high turbulence and aeration phenomena, that cannot be correctly studied by the classical methodologies. The Hydraulics Laboratory of the Universidad Politecnica de Cartagena (Spain) has an infrastructure designed specifically for the study of turbulent jets and energy dissipation in plunge pools. To improve the knowledge of the phenomenon of turbulent jets, we are measuring aeration rates by means of fiber optical equipment, velocities in different sections of the stilling basin with Doppler instrumentations and pressures on the bottom of the plunge pool with piezoresistive transducers. The methodology of Computational Fluid Dynamics (CFD simulates the interaction between different fluids, such a the air-water two-phase flows. The methods used in CFD are based on numerical solution of the Reynolds Averaged Navier-Stokes (RANS) equations, together with turbulence models of different degrees of complexity. The turbulence models can be classified as either eddy viscosity models (e. g. k-ε, RNG k-ε, k-ω) or Reynolds Stress Models (RSM). Two equations turbulence models are using to analyze most of the variables involved in the phenomenon, while second-order closure models are employing to obtain a better characterization of the turbulence of the jet. This paper compares the Parametric theory proposed by Castillo (2006, 2007) for the evaluation of hydrodynamic action in plunge pools, revised by Castillo and Carrillo (2011), with more and new laboratory measurements and the simulation results obtained with CFD software ANSYS CFX and FLOW 3D.