Abstract
The constitutive equations used in the Reynolds-averaged Navier–Stokes (RANS) equations are referred to as turbulence models. Although a large number of studies have been performed on the development of turbulence models, there has not been a universal turbulence model that is applicable to all turbulent flows. However, we in general suggest the use of the k-\(\varepsilon \) model for “simple” flows and the Large-Eddy Simulation (LES) for more complex flows (Chap. 8) found in many practical engineering applications. In this book, we refer to “simple flows” as stationary flows that have average streamlines that are relatively straight on the absolute coordinate system with low level of acceleration. Flows that impinge on walls, separate from corners, pass through a curved channel, and is in a rotational field would not be considered simple. In this and the next chapters, discussions on the strengths and limitations of these methods are offered. Since our objective is not to introduce all turbulence models available, we ask readers to refer to [3, 6, 28] for comprehensive reviews on RANS.
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Notes
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There are also different Boussinesq approximations that appear in the analysis of flows with buoyancy and water waves.
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Kajishima, T., Taira, K. (2017). Reynolds-Averaged Navier–Stokes Equations. In: Computational Fluid Dynamics. Springer, Cham. https://doi.org/10.1007/978-3-319-45304-0_7
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