Code and experimental images - Stable and unstable capillary fingering in porous media with a gradient in grain size

<p>Matlab script. Invasion Percolation code in graded matrices and gravity.<br> Pictures: experimental invasion of air at constant flow rate in a 3D-printed graded porous medium wet by glycerol/water.<br> <br> Originally designed for the following article: https://arxiv.org/abs/2203.15524.<br> Accepted in Communications Physics (2022).<br> <br> Can easily be tweaked for other problems</p>