Post-stall Navier-Stokes computations of the NREL airfoil using a kappa-omega turbulence model
Post-stall Navier-Stokes computations of the NREL airfoil using a kappa-omega turbulence model
- New search for: Yang, S.L.
- New search for: Chang, Y.L.
- New search for: Arici, O.
- New search for: Yang, S.L.
- New search for: Chang, Y.L.
- New search for: Arici, O.
This paper presents a two-dimensional numerical simulation of the turbulent flow fields of the NREL (National Renewable Energy Laboratory) S809 airfoil in the post-stall region. The flow is modeled as steady, viscous, turbulent, and incompressible. The pseudo-compressible formulation is used for the time-averaged Navier-Stokes equations so that a time marching scheme developed for the compressible flow can be applied directly. The turbulent flow is simulated using Wilcox's modified kappa-omega model to account for the low-Reynolds number effects near solid wall and the model's sensitivity to the freestream conditions. The governing equations are solved by an implicit approximate-factorization scheme. To correctly model the convection terms in the mean-flow and turbulence model equations, the symmetric TVD (Total Variational Diminishing) scheme is incorporated. The methodology developed is then applied to analyze the NREL S809 airfoil at various angles of attack (alpha) from 1 to 45 degrees. The accuracy of the numerical results is compared with the available Delft wind tunnel test data. For comparison, two Eppler code results at low angles of attack are also included. Depending on the value of alpha, preliminary results show excellent to fairly good agreement with the experimental data. Directions for future work are also discussed.
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Post-stall Navier-Stokes computations of the NREL airfoil using a kappa-omega turbulence model
Navier-Stokes-Berechnungen des NREL-Tragflächenprofils nach dem Abreißen mit Hilfe eines kappa-omega-Turbulenzmodells
1995
10 Seiten, 13 Bilder, 1 Tabelle, 37 Quellen
Conference paper
English
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