Derivation of ODEs and Bifurcation Analysis of a Two-DOF Airfoil Subjected to Unsteady Incompressible Flow

Figure 6

(a) Bifurcation diagrams showing both stable and unstable solutions for pitch motion, (b) expanded view of partial region from (a); 𝜇=200 and 𝑀(𝛼)=0.01𝛼+50𝛼³; •, stable fixed point; ∘, unstable fixed point; —, stable limit cycle; - - - , unstable limit cycle.

(a)

(b)