Fisher–KPP Reaction–Diffusion

Diffusion \(D\): 0.0080 Growth \(r\): 0.80 Carrying capacity \(K\): 1.00 Boundary condition: No-flux (Neumann) Zero (Dirichlet) Periodic Speed (dt factor): 0.50× Colormap: TriColor (blue → white → red) Viridis-like Ocean (navy → cyan → white) Grayscale Brush shape: Circle Square Triangle Star Octagon Random
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Fisher–KPP Equation

\[ \frac{\partial u}{\partial t} \;=\; D\,\nabla^2 u \;+\; r\,u\left(1-\frac{u}{K}\right) \]