A real fluid simulation, not a canned animation: thousands of particles are carried by a velocity field solved with the same semi-Lagrangian advection and pressure-projection technique real fluid-dynamics software uses. Switch between air, water, and honey to feel how viscosity changes everything, then drop a circle, square, or triangle into the current, or draw a wall of your own freehand, and watch the flow bend around it like a wind tunnel test.
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