دورية أكاديمية
Assessment of Turbulence Models for Unsteady Separated Flows Past an Oscillating NACA 0015 Airfoil in Deep Stall
| العنوان: | Assessment of Turbulence Models for Unsteady Separated Flows Past an Oscillating NACA 0015 Airfoil in Deep Stall |
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| المؤلفون: | S. Ouchene, A. Smaili, H. Fellouah |
| المصدر: | Journal of Applied Fluid Mechanics, Vol 16, Iss 8, Pp 1544-1559 (2023) |
| بيانات النشر: | Isfahan University of Technology, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Mechanical engineering and machinery |
| مصطلحات موضوعية: | dynamic stall deep stall turbulence modeling numerical simulation navier, stokes equations, Mechanical engineering and machinery, TJ1-1570 |
| الوصف: | This paper provides 2D Computational Fluid Dynamics (CFD) investigations, using OpenFOAM package, of the unsteady separated fully turbulent flows past a NACA 0015 airfoil undergoing sinusoidal pitching motion about its quarter-chord axis in deep stall regime at a reduced frequency of 0.1, a free stream Mach number of 0.278, and at a Reynolds number, based on the airfoil chord length, , of . First, eighteen 2D steady-state computations coupled with the SST model were carried out at various angles of attack to investigate the static stall. Then, the 2D 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 |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1735-3572 1735-3645 |
| Relation: | https://www.jafmonline.net/article_2242_61894476d259321053521c30ee9b54fb.pdf; https://doaj.org/toc/1735-3572; https://doaj.org/toc/1735-3645 |
| DOI: | 10.47176/jafm.16.08.1718 |
| URL الوصول: | https://doaj.org/article/870bb7f3c5654953a1f1c246c14ce1c9 |
| رقم الأكسشن: | edsdoj.870bb7f3c5654953a1f1c246c14ce1c9 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 17353572 17353645 |
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| DOI: | 10.47176/jafm.16.08.1718 |