Sandbox
Fluid Simulation
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How to play Fluid Sim
Fluid Sim is an interactive fluid-dynamics sandbox. Drag across the canvas to push and swirl a simulated fluid, creating flowing colour and turbulence that evolves in real time. It is a relaxing, goal-free toy that shows how fluids move and mix.
- 1 Click or drag anywhere on the canvas.
- 2 Your motion injects force and colour into the fluid.
- 3 Watch the swirls spread, mix, and fade.
- 4 Keep stirring to build new patterns.
Frequently asked questions
What does Fluid Sim do?
It simulates how a fluid responds to force, so dragging your pointer creates currents, vortices, and blended colour that flow naturally.
Is there an objective?
No — it is a sandbox for play and visual experimentation rather than a game you win.
Why does the motion fade?
Like a real fluid, the simulation loses energy to viscosity over time, so swirls gradually settle unless you keep adding motion.
Does it work on touch screens?
Yes — drag your finger across the canvas to stir the fluid on phones and tablets.