Drag & Lift • Streamlines • Reynolds Number • 6 Test Objects — Simulate • Explore • Practice • Quiz
| # | Question | Result |
|---|
A wind tunnel is an engineering testing facility that produces controlled airflow over test objects to study aerodynamic forces. By placing models of aircraft wings, vehicles, buildings, or simple geometric shapes in the test section, engineers can measure drag and lift forces, visualize flow patterns, and optimize designs for minimum resistance. This virtual wind tunnel simulator lets you experiment with 6 different test objects at various air speeds and angles of attack.
The simulator calculates real-time aerodynamic properties including drag coefficient (Cd), lift coefficient (Cl), Reynolds number, dynamic pressure, and force magnitudes. Animated streamlines show how air flows around each object, revealing phenomena like flow separation, wake formation, boundary layers, and the drag crisis that occurs when flow transitions from laminar to turbulent.
Drag force (Fd = ½ρV²ACd) acts parallel to the airflow direction, while lift (Fl = ½ρV²ACl) acts perpendicular to it. The Reynolds number (Re = ρVD/μ) determines whether flow is laminar or turbulent, which dramatically affects the drag coefficient. For example, a sphere experiences a sudden drop in Cd from 0.47 to 0.20 when Re exceeds approximately 300,000 — this is the famous drag crisis.
The NACA 0012 symmetric airfoil generates lift proportional to angle of attack in the linear region. As the angle increases beyond approximately 15°, flow separates from the upper surface causing a dramatic loss of lift known as stall. Understanding stall behavior is critical for aircraft safety and wing design. This simulator visualizes the pressure distribution changes that lead to stall.
This wind tunnel virtual lab is designed for aerospace and mechanical engineering students, aerodynamics researchers, automotive engineers, and physics instructors. It provides hands-on experience with aerodynamic testing concepts without requiring access to expensive wind tunnel facilities, making it ideal for classroom demonstrations and exam preparation.