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Aerospace 2017, 4(3), 41;

Assessing the Ability of the DDES Turbulence Modeling Approach to Simulate the Wake of a Bluff Body

CFD Laboratory LMFN, Département de Génie Mécanique, Université Laval, 1065 Avenue de la Médecine, Québec, QC G1V 0A6, Canada
Graduate Aerospace Laboratories, California Institute of Technology, Pasadena, CA 91125, USA
Author to whom correspondence should be addressed.
Received: 26 June 2017 / Revised: 26 July 2017 / Accepted: 28 July 2017 / Published: 1 August 2017
(This article belongs to the Special Issue Computational Aerodynamic Modeling of Aerospace Vehicles)
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A detailed numerical investigation of the flow behind a square cylinder at a Reynolds number of 21,400 is conducted to assess the ability of the delayed detached-eddy simulation (DDES) modeling approach to accurately predict the velocity recovery in the wake of a bluff body. Three-dimensional unsteady Reynolds-averaged Navier–Stokes (URANS) and DDES simulations making use of the Spalart–Allmaras turbulence model are carried out using the open-source computational fluid dynamics (CFD) toolbox OpenFOAM-2.1.x, and are compared with available experimental velocity measurements. It is found that the DDES simulation tends to overestimate the averaged streamwise velocity component, especially in the near wake, but a better agreement with the experimental data is observed further downstream of the body. The velocity fluctuations also match reasonably well with the experimental data. Moreover, it is found that the spanwise domain length has a significant impact on the flow, especially regarding the fluctuations of the drag coefficient. Nonetheless, for both the averaged and fluctuating velocity components, the DDES approach is shown to be superior to the URANS approach. Therefore, for engineering purposes, it is found that the DDES approach is a suitable choice to simulate and characterize the velocity recovery in a wake. View Full-Text
Keywords: wake; bluff body; square cylinder; DDES; URANS; turbulence model wake; bluff body; square cylinder; DDES; URANS; turbulence model

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Boudreau, M.; Dumas, G.; Veilleux, J.-C. Assessing the Ability of the DDES Turbulence Modeling Approach to Simulate the Wake of a Bluff Body. Aerospace 2017, 4, 41.

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