u_t = Du∇²u − uv² + F(1−u) · v_t = Dv∇²v + uv² − (F+k)v (Gray–Scott)

Periodic 5-point Laplacian, Δt=1, Δx=1. Color = v.

F
0.0370000
k
0.0600000
Du, Dv
0.16, 0.08
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