Source: https://github.com/MadLittleMods/airflow-fluid-simulator
Based off of Javascript 2D Fluid / Turbulence Sim by Dean Alex
The vector-field is persisted to local storage in the browser (refresh at will).
You can also download and save your creation or import a previously saved field
If you want to use your own background image, adjust the vector-field resolution, or create a gif animation see the readme FAQ