Spatiotemporal chemical waves · reaction-diffusion · scroll waves
The Oregonator is the minimal model for the Belousov-Zhabotinsky (BZ) reaction: ε(∂u/∂t) = u(1−u) − fw(u−q)/(u+q) + D∇²u. Variable u ≈ [HBrO₂] activator, v ≈ [Br⁻] inhibitor. Depending on f, ε, q: stable fixed point, limit cycle oscillations, or excitable excitations. Spatial coupling produces target patterns, spiral waves, and chaotic scroll waves.