Highly Accurate Solution of Limit Cycle Oscillation of an Airfoil in Subsonic Flow

Figure 4

The phase planes of LCOs of system (1) with 𝑈^∗=2𝑈^∗𝐿. Dots denote the 50th-order HAM solution with 𝜆=−1, real lines the numerical result, and dashed lines the HB1 one.

(a)

(b)