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Was (wer) ist turbulent - definition
![tip vortex]] from an [[airplane]] wing passing through coloured smoke](https://commons.wikimedia.org/wiki/Special:FilePath/Airplane vortex edit.jpg?width=200 "tip vortex]] from an [[airplane]] wing passing through coloured smoke")
![laser-induced fluorescence]]. The jet exhibits a wide range of length scales, an important characteristic of turbulent flows.](https://commons.wikimedia.org/wiki/Special:FilePath/False color image of the far field of a submerged turbulent jet.jpg?width=200 "laser-induced fluorescence]]. The jet exhibits a wide range of length scales, an important characteristic of turbulent flows.")
![Laminar]] and turbulent water flow over the hull of a submarine. As the relative velocity of the water increases turbulence occurs.](https://commons.wikimedia.org/wiki/Special:FilePath/Los Angeles attack sub 2.jpg?width=200 "Laminar]] and turbulent water flow over the hull of a submarine. As the relative velocity of the water increases turbulence occurs.")
Wikipedia
In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between those layers.
Turbulence is commonly observed in everyday phenomena such as surf, fast flowing rivers, billowing storm clouds, or smoke from a chimney, and most fluid flows occurring in nature or created in engineering applications are turbulent.: 2 Turbulence is caused by excessive kinetic energy in parts of a fluid flow, which overcomes the damping effect of the fluid's viscosity. For this reason turbulence is commonly realized in low viscosity fluids. In general terms, in turbulent flow, unsteady vortices appear of many sizes which interact with each other, consequently drag due to friction effects increases. This increases the energy needed to pump fluid through a pipe.
The onset of turbulence can be predicted by the dimensionless Reynolds number, the ratio of kinetic energy to viscous damping in a fluid flow. However, turbulence has long resisted detailed physical analysis, and the interactions within turbulence create a very complex phenomenon. Richard Feynman described turbulence as the most important unsolved problem in classical physics.
The turbulence intensity affects many fields, for examples fish ecology, air pollution, precipitation, and climate change.
