1996 | OriginalPaper | Chapter
Modelling Complex Draft-Tube Flows using Near-Wall Turbulence Closures
Authors : Y. Ventikos, Postdoctoral Associate, F. Sotiropoulos, Assistant Professor, V. C. Patel, Professor and Director
Published in: Hydraulic Machinery and Cavitation
Publisher: Springer Netherlands
Included in: Professional Book Archive
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This paper presents a finite-volume method for simulating flows through complex hydroturbine draft-tube configurations using near-wall turbulence closures. The method employs the artificial-compressibility pressure-velocity coupling approach in conjunction with multigrid acceleration for fast convergence on very fine grids. Calculations are carried out for a draft tube with two downstream piers on a computational mesh consisting of 1.2×106 nodes. Comparisons of the computed results with measurements demonstrate the ability of the method to capture most experimental trends with reasonable accuracy. Calculated three-dimensional particle traces reveal very complex flow features in the vicinity of the piers, including horse-shoe and longitudinal vortices and regions of flow reversal.