In the world of aerodynamics, precision is everything. Whether we’re optimizing the lift of an aircraft wing, minimizing drag on a car, or — in our case — developing cutting-edge eSAIL® technology to propel maritime vessels, aerodynamic accuracy drives performance. And one of the most powerful tools engineers have to ensure this accuracy is wind tunnel testing.
With the role digital simulations now play in engineering, some readers may be thinking wind tunnels sound a bit ‘old school’. However, physical testing in controlled airflow conditions continues to provide insights that no innovative model alone can fully replicate.
This article explains what wind tunnel testing is, why it still matters in a CFD-driven world, and how it underpins reliable performance prediction for wind propulsion at scale.
What is wind tunnel testing?
A wind tunnel is a controlled testing environment in which air is artificially driven past a stationary object to recreate real-world aerodynamic conditions. Rather than moving the object through air, the air itself is set in motion — allowing engineers to precisely measure how airflow interacts with the structure being tested. Think of it as a treadmill for air—only with a lot of sensors.
In wind tunnel testing, the object (such as an eSAIL®, wing or vehicle model) is mounted inside a test section and instrumented with sensors that measure:
• Aerodynamic forces such as lift, drag and bending moments
• Pressure distribution across surfaces
• Flow behaviour, including turbulence, separation and wake effects (....)