Eddy (fluid dynamics)

Eddy is a word used to describe a type of swirl or whirlpool that is caused when a fluid, like water or air, moves in a circular motion. It's like a little spinning storm that forms in the water or air. This can happen when the water or air is moving in different directions, or when it is being forced through an obstruction. These eddies can have different sizes and can last for different lengths of time. They are often used by scientists to study how water and air behave in the environment.