Unsteady aerodynamic effects in small-amplitude pitch oscillations of an airfoil

Negi PS, Vinuesa R, Hanifi A, Schlatter P, Henningson DS (2018)

Publication Type: Journal article

Publication year: 2018

Journal

International Journal of Heat and Fluid Flow Elsevier

Book Volume: 71

Pages Range: 378-391

DOI: 10.1016/j.ijheatfluidflow.2018.04.009

Abstract

High-fidelity wall-resolved large-eddy simulations (LES) are utilized to investigate the flow-physics of small-amplitude pitch oscillations of an airfoil at Rec=100,000. The investigation of the unsteady phenomenon is done in the context of natural laminar flow airfoils, which can display sensitive dependence of the aerodynamic forces on the angle of attack in certain “off-design” conditions. The dynamic range of the pitch oscillations is chosen to be in this sensitive region. Large variations of the transition point on the suction-side of the airfoil are observed throughout the pitch cycle resulting in a dynamically rich flow response. Changes in the stability characteristics of a leading-edge laminar separation bubble has a dominating influence on the boundary layer dynamics and causes an abrupt change in the transition location over the airfoil. The LES procedure is based on a relaxation-term which models the dissipation of the smallest unresolved scales. The validation of the procedure is provided for channel flows and for a stationary wing at Rec=400,000.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE)

How to cite

APA:

Negi, P.S., Vinuesa, R., Hanifi, A., Schlatter, P., & Henningson, D.S. (2018). Unsteady aerodynamic effects in small-amplitude pitch oscillations of an airfoil. International Journal of Heat and Fluid Flow, 71, 378-391. https://doi.org/10.1016/j.ijheatfluidflow.2018.04.009

MLA:

Negi, P. S., et al. "Unsteady aerodynamic effects in small-amplitude pitch oscillations of an airfoil." International Journal of Heat and Fluid Flow 71 (2018): 378-391.

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