Unsteady aerodynamic effects in pitching airfoils studied through large-eddy simulations
Negi PS, Vinuesa R, Schlatter P, Hanifi A, Henningson DS (2017)
Publication Type: Conference contribution
Publication year: 2017
Publisher: International Symposium on Turbulence and Shear Flow Phenomena, TSFP10
Book Volume: 1
Conference Proceedings Title: 10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017
Event location: Chicago, IL, USA
ISBN: 9780000000002
Abstract
Wall-resolved large-eddy simulations (LES) are utilized to investigate the flow-physics of an airfoil undergoing pitch oscillations. A relaxation-term (RT) based filtering procedure is employed to add limited high order dissipation to account for the dissipation from the smallest scales which are not resolved. Validation of the procedure is presented for turbulent channel flows and for flow around a wing section. The procedure is then used for the simulation of small-amplitude pitching airfoil at Rec = 100;000 with a reduced frequency k = 0:5. The investigation of the unsteady phenomenon is done in the context of a natural laminar flow airfoil, the performance of which depends critically on the suction side transition characteristics. The dynamic range of the pitch cycle sees the appearance, destabilization and disappearance of a laminar separation bubble at the leading edge. An abrupt change is seen in the lift coefficient, which is linked to a rapid movement of the transition point over the suction side. Destabilization of the laminar separation bubble is the cause of these rapid transition movements which occur near the end of the pitch-up phase of the cycle.
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APA:
Negi, P.S., Vinuesa, R., Schlatter, P., Hanifi, A., & Henningson, D.S. (2017). Unsteady aerodynamic effects in pitching airfoils studied through large-eddy simulations. In 10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017. Chicago, IL, USA: International Symposium on Turbulence and Shear Flow Phenomena, TSFP10.
MLA:
Negi, Prabal S., et al. "Unsteady aerodynamic effects in pitching airfoils studied through large-eddy simulations." Proceedings of the 10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017, Chicago, IL, USA International Symposium on Turbulence and Shear Flow Phenomena, TSFP10, 2017.
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