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A vortex flow might also be combined with a radial or axial flow pattern. In that case the streamlines and pathlines are not closed curves but spirals or helices, respectively. This is the case in tornadoes and in drain whirlpools. A vortex with helical streamlines is said to be solenoidal.
A persistent uniform resource locator (PURL) is a uniform resource locator (URL) (i.e., location-based uniform resource identifier or URI) that is used to redirect to the location of the requested web resource.
Although often hostile to archaeologists, some ley hunters attempted to ascertain scientific evidence for their belief in earth energies at prehistoric sites, evidence they could not obtain. Following sustained archaeological criticism, the ley hunter community dissipated in the 1990s, with several of its key proponents abandoning the idea and ...
Visualisation of the vortex street behind a circular cylinder in air; the flow is made visible through release of glycerol vapour in the air near the cylinder. In fluid dynamics, a Kármán vortex street (or a von Kármán vortex street) is a repeating pattern of swirling vortices, caused by a process known as vortex shedding, which is responsible for the unsteady separation of flow of a fluid ...
Under the right conditions, the local temperature in vortex cores may drop below the local freezing point, in which case ice particles will form inside the vortex cores. The water-vapor condensation mechanism in wingtip vortices is thus driven by local changes in air pressure and temperature.
The Oregon Vortex is a roadside attraction that opened to tourists in 1930, [1] located on Sardine Creek [2] in Gold Hill, Oregon, in the United States. It consists of a number of interesting effects, which are gravity hill optical illusions , but which the attraction's proprietors propose are the result of paranormal properties of the area.
Vortices are points in 2D fields and lines in 3D fields (as they have codimension two). Integrating the phase of the field around a path enclosing a vortex yields an integer multiple of 2 π. This integer is known as the topological charge, or strength, of the vortex. A hypergeometric-Gaussian mode (HyGG) has an optical vortex in its center ...
Overall, the tornado was on the ground for 40 minutes along a 16.2-mile (26.1 km) path. [20] A strong anticyclonic multi-vortex satellite tornado also formed southeast of the primary tornado at approximately 6:28 pm CDT (2328 UTC), and remained on the ground for 15 minutes before lifting at 6:43 (2343 UTC). Such companion tornadoes tend to be ...