Assessment of Turbulence Models for Unsteady Separated Flows Past an Oscillating NACA ۰۰۱۵ Airfoil in Deep Stall
Publish place: Journal of Applied Fluid Mechanics، Vol: 16، Issue: 8
Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JAFM-16-8_004
تاریخ نمایه سازی: 27 خرداد 1402
Abstract:
This paper provides ۲D Computational Fluid Dynamics (CFD) investigations, using OpenFOAM package, of the unsteady separated fully turbulent flows past a NACA ۰۰۱۵ airfoil undergoing sinusoidal pitching motion about its quarter-chord axis in deep stall regime at a reduced frequency of ۰.۱, a free stream Mach number of ۰.۲۷۸, and at a Reynolds number, based on the airfoil chord length, , of . First, eighteen ۲D steady-state computations coupled with the SST model were carried out at various angles of attack to investigate the static stall. Then, the ۲D Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations of the flow around the oscillating airfoil about its quarter-chord axis were carried out. Three eddy viscosity turbulence models, namely the Spalart-Allmaras, Launder-Sharma , and SST were considered for turbulence closure. The results are compared with the experimental data where the boundary layer has been tripped at the airfoil’s leading-edge. The findings suggest that the SST performs best among the other two models to predict the unsteady aerodynamic forces and the main flow features characteristic of the deep stall regime. The influence of moving the pitching axis downstream at mid chord was also investigated using URANS simulations coupled with the SST model. It was found that this induces higher peaks in the nose-down pitching moment and delays the stall onset. However, the qualitative behavior of the unsteady flow in post-stall remains unchanged. The details of the flow development associated with dynamic stall were discussed
Keywords:
Dynamic stall Deep stall Turbulence modeling Numerical Simulation Navier , stokes equations
Authors
S. Ouchene
Laboratory of Green and Mechanical Development-LGMD, Ecole Nationale Polytechnique, B.P. ۱۸۲, El-Harrach, Algiers, ۱۶۲۰۰, Algeria
A. Smaili
Laboratory of Green and Mechanical Development-LGMD, Ecole Nationale Polytechnique, B.P. ۱۸۲, El-Harrach, Algiers, ۱۶۲۰۰, Algeria
H. Fellouah
Department of mechanical engineering, Université de Sherbrooke, ۲۵۰۰ Boulevard de l’Université, Sherbrooke, Québec, J۱K۲R۱ Canada
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