Author(s): Luis G. Castillo; Jose M. Carrillo
Keywords: No Keywords
Abstract: Intake systems generally consist in a rack located in the bottom of the channel, so that the water collected passes down the rack. These structures have been adopted in small mountain rivers with steep slopes and irregular riverbed, with intense sediment transport and flood flow. Its design is intended to meet two primary objectives: : to derive as much water as it possible with the minimum solids. Noseda (1956) studied different typologies of racks. The racks were formed with bars with T profiles with the wing willing horizontal parallel to the direction of the flow, and L profiles with the long side perpendicular to the horizontal direction of flow. The bars used had the same width, but the longitudinal layout was modified to consider different spacing between them. In each test was measured the flow collected in the rack and the longitudinal profile of the flow in the centerline of the channel. The methodology of Computational Fluid Dynamics (CFD) simulate the interaction between different fluids, such as the sediment-water two-phase flows that appear in the phenomenon of intake systems. 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. This paper compares some of the experimental results in clear water, obtained by Noseda with the simulations results obtained with the CFD commercial programs ANSYS CFX and FLOW 3D.