- Dowell, E.H. and Bland, S.R. and Williams, M.H., Linear/nonlinear behavior in unsteady transonic aerodynamics,
AIAA J. (USA), vol. 21 no. 1
pp. 38 - 46 .
(last updated on 2007/04/10)
The authors assesses the range of parameters over which linear behavior occurs. In particular, calculations are made for an NACA 64A006 and also an MBB-A3 airfoil oscillating in pitch over a range of amplitudes, frequencies, and Mach numbers. The primary aerodynamic method used is the well known LTRAN2 code for Ballhaus and Goorjian (1978) that provides a finite difference solution to the low frequency, small disturbance, two-dimensional potential flow equation. Comparisons are made with linear subsonic theory, local linearization theory, and, for steady flow, with the full potential equation code of Bauer, Garabedian, and Korn (1972) in both its conservative and nonconservative form