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THMT-15. Proceedings of the Eighth International Symposium On Turbulence Heat and Mass Transfer
September, 15-18, 2015, Sarajevo, Bosnia and Herzegovina

DOI: 10.1615/ICHMT.2015.THMT-15


ISBN Print: 978-1-56700-427-4

ISBN CD: 978-1-56700-428-8

An assessment of Scale-Resolving Simulation models for the flow around a circular cylinder

pages 295-298
DOI: 10.1615/ICHMT.2015.THMT-15.540
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Краткое описание

The numerical prediction of turbulent flows is a challenging subject for researchers and engineers. In addition to the complex physics, the wide range of turbulent scales hampers its numerical simulation, making the direct resolution of the Navier-Stokes equations limited to simple cases. Reynods-Averaged Navier-Stokes (RANS) equations and Large-Eddy Simulation (LES) are two common and distinct mathematical models to resolve turbulent flows. By modelling the entire turbulent field, RANS is capable to achieve a fair trade-off among computational cost, accuracy and robustness for statistically steady flows. On the other hand, LES resolves the largest scales, modelling the smallest ones which tend to be easier to model and so it improves the modelling accuracy. However, RANS may lead to poor predictions, especially for statistically unsteady flows, and the correct usage of LES models is still too demanding for wall-bounded engineering applications. These shortcomings have driven the development of a new class of mathematical models that fill in the gap between RANS and LES, i.e. formulations capable to operate at larger scales than LES. Delayed Detached-Eddy Simulation (DDES), eXtra Large-Eddy Simulation (XLES), and Partially-Averaged Navier-Stokes (PANS) equations are examples of such Scale-Resolving Simulation (SRS) models, which are often named bridging or hybrid models. In this work, SRS and RANS models are assessed by performing verification and validation exercises for the flow past a circular cylinder at Re = 3900, which is a statistically unsteady flow due to the existence of vortex shedding.

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