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Comparison of low, medium and high fidelity numerical methods for unsteady aerodynamics and nonlinear aeroelasticity
Claudia Fernandez-Escudero (Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Polytechnique Montréal), Miguel Gagnon (Polytechnique Montréal), Éric Laurendeau (Polytechnique Montréal), Sébastien Prothin (Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)), Guilhem Michon (Centre National de la Recherche Scientifique, Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)), Annie Ross (Polytechnique Montréal)
Abstract: The unsteady aerodynamic and aeroelastic behavior of a 2D wing section with and without flap is analyzed with Theodorsen theory and Unsteady Vortex Lattice Method (low fidelity), Euler (medium fidelity) and Reynolds-Averaged Navier Stokes (high fidelity) methods. The aeroelastic studies are carried out for linear cases and non-linear structural configurations presenting cubic stiffness and freeplay. The critical flutter speeds as well as the limit cycle oscillations present in the non-linear cases are compared. The methods show good agreement for the cases studied.