Kutta, a Tiny Wind Tunnel in Go

crg@crg.eti.br (Cesar Gimenes) — Wed, 08 Jul 2026 00:30:00 -0300

You can explain lift with a diagram and an equation. It rarely sticks. Watch a wake peel off the back of a wing while you turn the angle of attack, and it sticks immediately. That gap is the whole reason Kutta exists.

It is a small 2D wind tunnel written in Go, rendered with Ebitengine, running as a single desktop app.

The idea never grew past the first sketch: stream air past an airfoil and make the flow visible. Change the angle of attack and the field reacts. Toggle between speed, vorticity and a pressure-like field. Draw your own shape. Cut a wing into a wing and a flap, animate the flap, and watch the wake go unstable when the geometry or the angle gets greedy.

Ebitengine on Cesar Gimenes

Kutta, a Tiny Wind Tunnel in Go