Sensitivity analysis of airfoil aerodynamics during pitching motion at a Reynolds number of 1.35×105

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Numerically reproducing wind tunnel experimental tests of flow behavior around a pitching airfoil is a challenge, especially under the occurrence of dynamic stall at relatively high angles of attack. This not only requires the application of advanced turbulence models, but also asks for examining the influence of the most relevant model parameters in detail. This contribution presents the results of an extensive computational study of the unsteady flow around a pitching NACA0012 airfoil at a Reynolds number of 1.35 × 105, as obtained by first performing 2D Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations whereby the flow characteristics are simulated by the Transition SST turbulence model. The influence of a large number of parameters on the numerical results is investigated, namely the blockage ratio, computational grid resolution and y+ value, time step size, inlet freestream turbulence properties, airfoil trailing edge detailing and turbulence model. Integral aerodynamic force coefficients and detailed flow patterns are analyzed and compared with measurements from wind tunnel experiments presented in the literature. For the best-performing parameters, an adequate agreement with the experimental tests is obtained for the upstroke phase, while for the downstroke phase some differences appear. These differences are investigated in more detail by considering the results from a 2.5D Large Eddy Simulation (LES), which provides deep and complementary insights into the flow behavior during dynamic stall at the selected Reynolds number.

TaalEngels
Pagina's315-332
Aantal pagina's18
TijdschriftJournal of Wind Engineering and Industrial Aerodynamics
Volume183
DOI's
StatusGepubliceerd - 1 dec 2018

Vingerafdruk

Turbulence models
Airfoils
Sensitivity analysis
Aerodynamics
Reynolds number
Wind tunnels
Large eddy simulation
Unsteady flow
Angle of attack
Flow patterns
Turbulence
Experiments

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    title = "Sensitivity analysis of airfoil aerodynamics during pitching motion at a Reynolds number of 1.35×105",
    abstract = "Numerically reproducing wind tunnel experimental tests of flow behavior around a pitching airfoil is a challenge, especially under the occurrence of dynamic stall at relatively high angles of attack. This not only requires the application of advanced turbulence models, but also asks for examining the influence of the most relevant model parameters in detail. This contribution presents the results of an extensive computational study of the unsteady flow around a pitching NACA0012 airfoil at a Reynolds number of 1.35 × 105, as obtained by first performing 2D Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations whereby the flow characteristics are simulated by the Transition SST turbulence model. The influence of a large number of parameters on the numerical results is investigated, namely the blockage ratio, computational grid resolution and y+ value, time step size, inlet freestream turbulence properties, airfoil trailing edge detailing and turbulence model. Integral aerodynamic force coefficients and detailed flow patterns are analyzed and compared with measurements from wind tunnel experiments presented in the literature. For the best-performing parameters, an adequate agreement with the experimental tests is obtained for the upstroke phase, while for the downstroke phase some differences appear. These differences are investigated in more detail by considering the results from a 2.5D Large Eddy Simulation (LES), which provides deep and complementary insights into the flow behavior during dynamic stall at the selected Reynolds number.",
    keywords = "Dynamic stall, Large eddy simulation (LES), Pitching airfoil, Sensitivity study, Unsteady Reynolds-Averaged Navier-Stokes (URANS)",
    author = "F. Geng and I. Kalkman and Suiker, {A. S.J.} and B. Blocken",
    year = "2018",
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    Sensitivity analysis of airfoil aerodynamics during pitching motion at a Reynolds number of 1.35×105. / Geng, F.; Kalkman, I.; Suiker, A. S.J.; Blocken, B.

    In: Journal of Wind Engineering and Industrial Aerodynamics, Vol. 183, 01.12.2018, blz. 315-332.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

    T1 - Sensitivity analysis of airfoil aerodynamics during pitching motion at a Reynolds number of 1.35×105

    AU - Geng,F.

    AU - Kalkman,I.

    AU - Suiker,A. S.J.

    AU - Blocken,B.

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    KW - Large eddy simulation (LES)

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