Perfectly Matched Layers (PML) — see the difference

This demo shows a saturated poroelastic wave propagating under an impact load, with two otherwise identical models: one with Perfectly Matched Layers (PML) and one without. PML is an absorbing layer designed to eliminate spurious boundary reflections by applying matched attenuation (via complex coordinate stretching) while remaining impedance‑matched at the interface—so the interior “doesn’t see” a boundary. Scrub the timeline to compare side‑by‑side contours and synchronized probe traces of displacement and Δ pore water pressure.