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Analysis of URANS capabilities on modeling airfoil pitching flows

DOI: 10.1615/ICHMT.2015.THMT-15.500
pages 279-282

A.F. Medina
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila 2121, Campus Santa Monica, 38408100 Uberlandia, Minas Gerais, Brasil

F. J. Souza
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila 2121, Campus Santa Monica, 38408100 Uberlandia, Minas Gerais, Brasil


This document describes the investigation of the behavior of the flow over a pitching NACA0012 airfoil at Reynolds number Re=100,000 and Re=2,500,000 of the analysis of a two-dimensional k-ω SST (Shear Stress Transport) simulation. The behavior of the flow wake at the trailing edge is studied by the analysis of streamlines for each incidence angle and results are compared by the study of theoretical concepts and experimental data. The use of standard Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulation has shown accuracy in predicting stall and reattachment incidence angles for upstroke and downstroke. The simulations were also capable of capturing flow information in agreement with experiments despite the over prediction of lift and drag coefficients, due to the two-dimensional simplification. The study has also compared the two-dimensional URANS k-ω SST model simulation data with previous results from three-dimensional simulation Large Eddy Simulation (LES) model analysis, showing that the qualitative behavior of the hysteresis loop is close for both computations, although there is a quantitative deviation in the results for upstroke and downstroke in the lift coefficient loop.

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