A wind tunnel in your pocket. Pick a shape, hit play, and watch thousands of particles stream around it in real time. WindFlow Sandbox is an interactive 2D aerodynamics simulation that lets you SEE why some objects are "slippery" and others are "bricks" — a hands-on physics lab for drag, airflow, and aerodynamic intuition.

Drop in an F1 car next to a brick of a tower. Tilt the angle of attack, crank the wind speed, and watch the airflow bend, separate, and swirl. Flow is color-coded by speed so you can read it at a glance: blue = slow air, green = freestream, red = fast air. Flip on the CFD-style low-pressure WAKE overlay to reveal the turbulent dead-air zone trailing behind each shape.

WHY YOU'LL LIKE IT
• Real-time particle flow — thousands of streaks colored by speed, streaming around the whole object.
• Live drag readout — drag coefficient (Cd), drag force in newtons, fineness ratio, and a 1–5 star "slipperiness" rating update as you tinker.
• CFD-style wake overlay — translucent blue low-pressure zone shows exactly where the air detaches behind blunt bodies.
• Wind speed & angle-of-attack sliders — change conditions on the fly and watch the numbers respond instantly.
• Tinker-friendly settings panel — tune field pull, turbulence, wake slowdown, wake vortex, particle density, streak length, and flow color.
• Pinch, drag, zoom & pan — get right up close to any detail of the stream.
• Play, pause & slow motion — freeze a frame or slow it down to study how the flow develops.
• Draw your own shapes — sketch a freehand silhouette, refine it with drag-handles, test it in the wind, and save your designs to the gallery.
• One-tap random shapes — drop a fresh, procedurally generated blob into the tunnel whenever you want a new subject to test.

10 OBJECTS TO COMPARE
Teardrop, airplane, sleek sedan, hatchback, F1 car, boat hull, SUV, sphere, cyclist, and tower. Each is a high-resolution silhouette whose entire perimeter drives the airflow — so the differences you see between a streamlined teardrop and a boxy SUV are real, not faked.

GREAT FOR
• Students & educators bringing physics and STEM to life
• Car & motorsport fans curious why some bodies cut the air and others fight it
• Engineers and tinkerers who just like watching flow fields
• Anyone who's ever wondered why a teardrop beats a brick

A SANDBOX, NOT A TEXTBOOK
There are no levels to grind and no right answers. Set up an experiment, change one variable, and see what happens. No formulas to memorize first — just experiment, observe, and build real intuition about how air moves around objects.

PRIVACY-FIRST & FULLY OFFLINE
• Works 100% offline — no internet permission required.
• No ads. No accounts. No sign-in.
• Collects and transmits NO personal data — everything runs on your device.
• Completely free.

Stop guessing which shape is more aerodynamic and watch it happen. Set the wind, tilt the angle, and let the particles show you. Download WindFlow Sandbox and start exploring the invisible world of airflow, drag, and lift — one shape at a time.

Topics you can explore: aerodynamics, drag coefficient, fluid dynamics, wind tunnel testing, airflow visualization, streamlining, lift and drag, angle of attack, wake and turbulence, car aerodynamics, physics simulation, and STEM education.