🌀 Double Pendulum: Chaos, Lyapunov Divergence and Normal Modes (2D)

2D companion of the 3D double pendulum: exact Lagrangian dynamics integrated with RK4, a twin pendulum started 1e-6 rad apart to measure the divergence rate, angle and phase plots, energy budget and the small-angle normal-mode frequencies.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install