Non-Newtonian Fluid Simulator (2D)

Interaction

Impact force / speed 1.6×

Suspension

Particle density 720

Mixture flowing — drag slowly across the tray, or punch it hard.

Live Readout

State

liquid

Effective viscosity

1.0 Pa·s

Applied shear rate

0.00 /s

Peak resistance

–

How it works

Oobleck is a suspension of cornstarch grains in water. At rest, or under a slow push, the grains simply roll and slide past each other — the mixture behaves like an ordinary liquid and flows around your finger.

A fast impact forces the grains together faster than the water between them can escape, so friction instantly locks the grains into a rigid, jammed cluster — the suspension behaves like a solid for a fraction of a second and resists the blow, then relaxes back into a liquid once the stress is gone.

This model computes a local shear rate from how fast neighboring particles move relative to each other, then raises the effective viscosity with the square of that shear rate (a shear-thickening, Ostwald–de Waele power-law fluid with flow index n>1) — the same principle used in liquid body-armor inserts.

Drag across the tray · slow = flows, fast = jams solid