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1996 | OriginalPaper | Buchkapitel

Modelling Complex Draft-Tube Flows using Near-Wall Turbulence Closures

verfasst von : Y. Ventikos, Postdoctoral Associate, F. Sotiropoulos, Assistant Professor, V. C. Patel, Professor and Director

Erschienen in: Hydraulic Machinery and Cavitation

Verlag: Springer Netherlands

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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.

Metadaten
Titel
Modelling Complex Draft-Tube Flows using Near-Wall Turbulence Closures
verfasst von
Y. Ventikos, Postdoctoral Associate
F. Sotiropoulos, Assistant Professor
V. C. Patel, Professor and Director
Copyright-Jahr
1996
Verlag
Springer Netherlands
DOI
https://doi.org/10.1007/978-94-010-9385-9_13

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