New Research Overturns Long-Held Belief That Smoother Surfaces Always Reduce Aerodynamic Drag
By
littlexsparkee
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· 2 sourcesNew research has overturned the long-held aeronautical principle that smoother surfaces always reduce aerodynamic drag. Hacker News reported that certain surface textures can help maintain laminar flow longer by delaying the transition to turbulent flow, challenging conventional wisdom for high-speed vehicles. Bluesky added that under certain high-speed conditions, intentionally roughened surfaces can improve performance by manipulating the boundary layer between laminar and turbulent flow. The findings could lead to new design approaches for aircraft, cars, and bullet trains.
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Summary
A long-held principle of aeronautical engineering — that smoother surfaces always reduce aerodynamic drag — has been overturned by new research. The article explains that while laminar (orderly) airflow reduces friction and drag, certain surface textures or roughness can actually help maintain laminar flow longer by delaying the transition to turbulent flow. This challenges the conventional wisdom that perfectly smooth surfaces are always optimal for high-speed vehicles like aircraft, cars, and bullet trains, and could lead to new design approaches that strategically use surface texture to improve aerodynamic efficiency.
Key quotes
· 3 pulledAerodynamic drag is a major 'barrier' in high-speed airplanes, automobiles, and bullet trains.
The longer the air stays in the laminar flow state with low friction, the smaller the air resistance becomes.
It's long been accepted that the smoother the surface, the lower the aerodynamic drag. That turns out not always to be the case.
