Prediction of developing turbulent flow in 90-degree curved ducts using linear and non-linear low-Re k- models

M Raisee, H Alemi, Hector Iacovides

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This paper reports the outcome of applying two different low-Reynolds number eddy-viscosity models to resolve the complex three-dimensional motion that arises in turbulent flows in ducts with bends. For the modeling of turbulence, the Launder and Sharma low-Re model and a recently produced variant of the cubic non-linear low-Re model have been employed. In this paper, developing turbulent flow through two different bends is examined: a square bend, and a rectangular bend with an aspect ratio of 6. The numerical results indicate that for the bend of square cross-section the curvature induces a strong secondary flow, while for the rectangular cross-section the secondary motion is confined to the corner region. For both curved ducts, the secondary motion persists downstream of the bend, although it slowly disappears with the main stream development. For the bend of square cross-section, comparisons indicate that both turbulence models can produce reasonable predictions. For the bend of rectangular cross-section, where a wider range of data is available, while both turbulence models produce satisfactory predictions of mean flow field, the nonlinear model returns superior predicti
    Original languageEnglish
    Pages (from-to)1379-1405
    Number of pages27
    JournalInternational Journal for Numerical Methods in Fluids
    Volume51
    DOIs
    Publication statusPublished - 2006

    Keywords

    • Curved Ducts
    • Turbulent Flow Computations
    • Non-Linear Effective-Viscocity Models

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