Viscous Fingering — Saffman-Taylor Instability

Less viscous fluid displacing more viscous fluid in a Hele-Shaw cell

Surface tension: 0.3

Anisotropy: 0.05

Cells filled: 0

DLA-like growth with surface-tension suppression — fingertip curvature penalty reduces branching. Click canvas to add a seed. Lower surface tension = more fractal, more finger-tip splitting.