Nopeuspyörre

Nopeuspyörre, often translated as vortex or whirlpool, refers to a phenomenon where a fluid, such as water or air, rotates around an axis. This rotation can occur in both liquids and gases and is characterized by a swirling motion. The formation of a nopeuspyörre is often influenced by factors like the movement of the fluid, obstacles in its path, or differences in speed within the fluid.

In water, nopeuspyörteet are commonly observed in rivers, especially near bends or obstacles, and in oceans where currents meet or tides change. These can range from small, transient swirls to large, powerful whirlpools capable of affecting navigation. The force of a nopeuspyörre is determined by the speed of the rotating fluid and the size of the vortex.

In the atmosphere, nopeuspyörteet manifest as wind vortices. Smaller examples include dust devils, which are rotating columns of air and dust, or eddies that form behind buildings or trees. Larger and more complex atmospheric nopeuspyörteet are associated with weather systems, such as tornadoes, which are violently rotating columns of air extending from a thunderstorm to the ground. The dynamics of nopeuspyörteet are studied in fields like fluid dynamics and meteorology.