Some Swirling-flow Challenges for Turbulent CFD |
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Authors: | Tim Craft Hector Iacovides Brian Launder Athanasios Zacharos |
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Institution: | (1) School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, P.O. Box 88, Manchester, M60 1QD, UK |
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Abstract: | The paper examines some of the continuing challenges, within a RANS framework, of computing turbulent swirling flows such
as are encountered in industry and the environment. The principal focus is on modelling turbulent transport processes but
serious problems also arise in handling numerical issues, too. Recent researches of two of these types of flow by the authors
and their colleagues in the Turbulence Mechanics Group at Manchester are examined; namely, the confined flow within a rotor–stator
disc cavity and the trailing wing-tip vortex. The former flow, while geometrically axisymmetric, has been found to create
multiple rotating vortices necessitating a three-dimensional time-dependent analysis. The wing-tip vortex is extremely sensitive
to the choice of turbulence model and only a second-moment closure that complies with the constraints of two-component turbulence
has been found capable of handling both the flow over the wing and the wake vortex. Moreover, because of the large distances
downstream of the aircraft to which, for practical cases, computations need to be carried, the numerical strategy is brought
into question. Finally, arising from these two test cases, outline remarks are made about a swirling flow that poses one of
the major computational challenges of the twenty-first century. |
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Keywords: | Swirling flows Rotor– stator flow Wingtip vortices Hurricanes |
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