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Prediction of Transonic Buffet by Delayed Detached-Eddy Simulation

Grossi, Fernando and Braza, Marianna and Hoarau, Yannick Prediction of Transonic Buffet by Delayed Detached-Eddy Simulation. (2014) AIAA Journal, 52 (10). 2300-2312. ISSN 0001-1452

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Official URL: http://dx.doi.org/10.2514/1.J052873

Abstract

A delayed detached-eddy simulation of the transonic buffet over a supercritical airfoil is performed. The turbulence modeling approach is based on a one-equation closure, and the results are compared to an unsteady Reynolds-averaged Navier–Stokes simulation using the same baseline model as well as experimental data. The delayed detached-eddy simulation successfully predicts the self-sustained unsteady shock-wave/boundary-layer interaction associated with buffet. When separation occurs, the flow exhibits alternate vortex shedding and a spanwise undulation. The method also captures secondary fluctuations in the boundary layer that are not predicted by unsteady Reynolds-averaged Navier–Stokes simulation. A map of flow separation emphasizes the differences between the delayed detached-eddy simulation and unsteady Reynolds-averaged Navier–Stokes flow topologies. Statistical pressure distributions and velocity profiles help assess the performance of each model. They indicate that the delayed detached-eddy simulation tends to overestimate the flow unsteadiness near the trailing edge. Instantaneous distributions of Reynolds-averaged Navier–Stokes and large-eddy simulation regions during buffet show that the delayed detached-eddy simulation enforces Reynolds-averaged Navier–Stokes mode near the airfoil even when the boundary layer gets very thick.

Item Type:Article
Additional Information:Thanks to American Institute of Aeronautics and Astronautics publisher. The original publication is available at http://arc.aiaa.org/loi/aiaaj
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Université de Strasbourg - UNISTRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Johannes SCHELLER
Deposited On:20 Nov 2014 16:36

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