ME24 · Sem 5 · Fluid mechanics
Square prism in cross-flow
Aim: Compare drag and shedding of a square section with a circular one.
🧪 Live simulation🧊 Real-time 3D bench⚠ Simulated values, not physical measurements
🔬 Virtual lab
Starting the lab…
📘 Theory
Sharp corners fix the separation points, giving a wider wake and higher drag than a cylinder. The Strouhal number is lower, about 0.13.
Cd(square) > Cd(cylinder)
🧰 Apparatus (virtual)
- Wind tunnel
- square prism model
📝 Procedure
🎤 Viva questions
Why are bridge decks shaped with fairings
To reduce drag and vortex-induced vibration.
Where does flow separate on a square
At the front corners.
🛡️ Safety
Virtual by default. Machine shops, CNC, presses and test rigs need instructor supervision, PPE and machine-specific safety training.