A Bluff Body (Sometimes known as a blunt body) in aerodynamics is an object, where a significant portion of the surface area is separated flow. A visualisation of a bluff body with separated flow is below, coloured by wind speed, blue being slow speed, red being high speed.
An example of a bluff body could be:
- A building in the wind
- A non-stationary freight lorry
- Golf ball flying through the air
Important to note, spheres and cylinders are considered to be bluff bodies since they have a significant separation at higher Reynolds numbers.