Pixel Wind Tunnel vs FlatSixDynamics

Draw a shape. Tap Simulate. Watch real fluid dynamics come alive in pixels. Pixel Wind Tunnel is a 2D fluid simulation app that runs real CFD (Computational Fluid Dynamics) calculations right on your device. No simplified approximations — the app solves the incompressible Navier-Stokes equations using the CIP advection method and Pressure Poisson solver, the same mathematical framework used in professional engineering software. HOW IT WORKS Draw any shape with your finger — airfoils, cars, buildings, anything Tap Simulate Watch the flow develop in real time That's it. Real fluid physics in three steps. SEE THE FLOW Switch between visualization modes to explore different aspects of the physics: • Velocity — where the flow speeds up and slows down • Pressure — high and low pressure regions around your shape • Vorticity — spinning structures and vortex shedding • Streamlines — paths that fluid particles follow MEASURE PERFORMANCE Real-time aerodynamic coefficients calculated from surface pressure and viscous stress integration: • Drag coefficient (Cd) • Lift coefficient (Cl) • Reynolds number Draw two different shapes and compare which one has less drag. Understand why streamlined shapes work better — with real numbers, not guesswork. EXPLORE DEEPER • Place point probes anywhere to track velocity and pressure over time • Scrub through simulation history with the timeline slider • Adjust inlet velocity and viscosity to change flow conditions • Save shapes with screenshots and reload them anytime REAL CALCULATION, NOT AN ANIMATION Every frame you see is computed from the actual Navier-Stokes equations. The CIP (Cubic Interpolated Propagation) method handles advection with minimal numerical diffusion, while the SOR iterative solver resolves the pressure field. Boundary conditions, viscous forces, and flow separation are all physically modeled. FOR CURIOUS MINDS Whether you're a student studying fluid mechanics, an engineer sketching quick ideas, a teacher demonstrating aerodynamics in class, or simply someone who wonders why things are shaped the way they are — draw it and find out.

See real airflow around a reference car — free, with every feature included. No account, no subscription, no in-app purchase FlatSixDynamics is a wind tunnel you can hold. The air around the silhouette of a rear-engined sports car moves live, frame by frame, right on your device. Change the setup, and watch the air answer. No footage. No fakery. Actual physics. You set it. You see the result. Drop the ride height from stock to track, and watch the floor start to work: the air under the car speeds up, pressure falls, and the body is pulled toward the road. Deploy the rear wing, and watch the wake behind the car close. Push the speed slider from a standstill to four hundred kilometers per hour, and watch the spoiler rise on its own, exactly as it does on the real vehicle. Every setup change comes back as a number. Track stance at two hundred kilometers per hour: watch the drag figure settle against stock, while the downforce reading breathes with the wake behind the car. Not your car's certified figures. But a number you can argue with.