Lift characteristics of two tandem airfoils in the globally unstable wake of a heated cylinder
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Lift characteristics of two tandem airfoils in the globally unstable wake of a heated cylinder Xiangyu Zhai1 · Bo Yin1 · Nader Karimi2,3 · Vikrant Gupta4 · Larry K. B. Li1 · Yu Guan1 · Wen Ao5 Received: 29 May 2020 / Accepted: 10 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract In this numerical study, we use two-dimensional scale-adaptive simulations to investigate the lift characteristics of two tandem airfoils in the globally unstable wake of a cylinder at a Reynolds number of 1 04, with and without cylinder heating. Both airfoils have NACA 0012 profiles and are at the same angle of attack (α = 10°), implying zero decalage. We find that the lift characteristics of both airfoils depend strongly on the streamwise distance (X) between the trailing point of the cylinder and the leading edge of the fore airfoil. At the conditions of this study (1 ≤ X/D ≤ 5, where D is the cylinder diameter), both airfoils experience periodic limit-cycle oscillations in their lift coefficients (Cl) at the same frequency. However, when X/D
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