Flow Around Thick Airfoils at Very High Reynolds Number. Stall and Dynamic Stall Applications

Barnaud, Félix; Bénard, Pierre; Lartigue, Ghislain; Moureau, Vincent; Deglaire, Paul

doi:10.1007/978-3-030-04915-7_47

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…The computed mean value exhibits an overestimation when juxtaposed with the measured data. Notable deviations are discernible during the downstroke motion, attributable, at least in part, to inherent limitations associated with unsteady RANS turbulence modeling -a phenomenon corroborated in other numerical simulations [39]. Analogous findings have also been reported in related literature by Qian et al for example [40].…”

Section: Sensitivity Analysissupporting

confidence: 81%

Sensitivity Analysis of an Unsteady Flow Around a Pitching Airfoil

Añez,

Hamdani,

Reveillon

et al. 2023

OpenFOAM J

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Various ways to control the loads and thus the output of the wind turbine by pitching the blades and by controlling the rotational speed already exist. However, adverse pressure gradient leading to flow separation at the trailing edge, with relatively high angles of attack (AOA) due to blade-pitching motion, largely affects the airfoil aerodynamic performance. This work presents the results of a numerical study of the unsteady flow around a pitching FFA-W3-301 airfoil at a Reynolds 1.6 × 106 using OpenFOAM®, as obtained by first performing 2D Unsteady Reynolds-Averaged Navier- Stokes (URANS) simulations whereby the flow characteristics are simulated by the shear stress transport (SST) k − ω model and Spalart-Allmaras (SA). The influence of various parameters on the numerical results is investigated, namely y+, computational grid resolution, dynamic mesh technique, time step and turbulence model. Integral aerodynamic forces and detailed flow patterns are compared with experimental measurements presented in the literature. A range of angles of attack, including early stalls, are examined. For best-performing parameters, an adequate refinement close to the wall was imperative in order to match experiments, especially during the upstroke motion of the airfoil, while for the downstroke phase, some differences still appeared. The agreement was greatly improved by using a 2.5D hybrid RANS-LES approach with enhanced delayed-Detached Eddy Simulation (DES) capabilities.

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Section: Sensitivity Analysissupporting

confidence: 81%

Sensitivity Analysis of an Unsteady Flow Around a Pitching Airfoil

Añez,

Hamdani,

Reveillon

et al. 2023

OpenFOAM J

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Comparison of the free vortex wake and actuator line methods to study the loads of a wind turbine in imposed surge motion

Corniglion

Harris

Peyrard

et al. 2020

J. Phys.: Conf. Ser.

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To enable the development of floating offshore wind farms, it is important to have a clear understanding of the aerodyamic forces applied on a floating offshore wind turbine. The paper presents comparisons between a lifting line free vortex wake method and an actuator line method in the case of a wind turbine in surge with blade-resolved CFD data as a reference. Each model is compared to a quasi-steady estimation of the loads to understand the variations due to the surge movement. The near-wake flow field is investigated in order to give an insight into the flow features leading to the observed behavior. Both methods predict a higher axial velocity at the position of the rotor and one radius downstream of the rotor in surge conditions compared to the fixed case.

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Flow Around Thick Airfoils at Very High Reynolds Number. Stall and Dynamic Stall Applications

Cited by 2 publications

References 8 publications

Sensitivity Analysis of an Unsteady Flow Around a Pitching Airfoil

Sensitivity Analysis of an Unsteady Flow Around a Pitching Airfoil

Comparison of the free vortex wake and actuator line methods to study the loads of a wind turbine in imposed surge motion

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