The FitzHugh-Nagumo model. 1D travelling waves

We include diffusion term D Δu = D ∂2u / ∂x2 to get running waves
    t u = DΔu + F(u, v) = DΔu + u(1 - u)(u - a) - v,
    ∂t v = H(u, v) = ε (bu - v).

a b ε Δt Δx D speed

delay Ymin Ymax it fps
This script uses simple explicit algorithm. It makes it time steps per frame. Full ring length is 1024×Δx. Here we shall test parameters for 2D simulations.
Heart rhythms     updated 2 Dec 2011