The term vortex is used to designate a swirling movement of fluid or particles, it is also a swimming pool accessory (which reproduces the vortex of the liquid).
Vortex principle
Swirl flow where fluid particles rotate around an instantaneous axis. Do not confuse these vortices or swirls characterizing an overall structure of the flow and the vorticity of the particles which reflects their rotation on themselves.
Vortices appear in particular at the tips of the wings of planes (von alleys Karman).
The simplest rectilinear vortices are modeled in fluid mechanics by fields of speed of the form Vrnot= C, where r is the radius vector, C a constant.
Prandtl’s wing marginal vortex model is an example of irrotational vortices (particles revolve around a fixed direction but not spin on themselves, like the nacelles of a large fairground wheel). On the other hand, the fluid particles rotate on themselves in a boundary layer laminar of flat plate while their trajectory is almost rectilinear, it is therefore not a vortex flow but it is rotational.
Turbulent flows are the seat of both eddies (at large scales) and vorticity (rotational) at smaller scales where energy dissipates under the effect of viscosity.
The hard drive vortex
By extension, when a system of vector fields forms vortex structures, we also speak of a vortex. This is the case for the magnetic field produced by the magnetization of the surfaces of HDDs.
The vortex for swimming pools
OEMs from swimming pools offer devices of the same name that can be associated with a skimmer to accentuate the effect when vacuuming debris. In a vortex-type filter or pump, the components of the device are distributed in a radius around a central point: the suction thus becomes more efficient.
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