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Encyclopedia > Eddy (fluid dynamics)

In fluid dynamics, an eddy is the swirling of a fluid and the reverse current created when the fluid flows past an obstacle. The moving fluid creates a space devoid of downstream-flowing water on the downstream side of the object. Fluid behind the obstacle flows into the void creating a swirl of fluid on each edge of the obstacle, followed by a short reverse flow of fluid behind the obstacle flowing upstream, toward the back of the obstacle. This phenomenon is most visible behind large emergent rocks in swift-flowing rivers. Fluid dynamics is the sub-discipline of fluid mechanics dealing with fluids (liquids and gases) in motion. ... A fluid is defined as a substance that continually deforms (flows) under an applied shear stress regardless of the magnitude of the applied stress. ... A current is a movement or flow of fluids, especially water in a river or ocean. ... For other uses, see River (disambiguation). ...

Another possible turbulence is the vortex. This notion is rather applied to gases than to liquids. Here, no void is created, but only an area of lower pressure, but again, a backflow causes the gas to rotate. In fluid dynamics, turbulence or turbulent flow is a flow regime characterized by chaotic, stochastic property changes. ... Vortex created by the passage of an aircraft wing, revealed by coloured smoke A vortex (pl. ... This article does not cite any references or sources. ... Approximately, the partial pressure of a gas in atmospheres in a mixture or solution is what would be the pressure of that gas if all other components of the mixture or solution suddenly vanished without its temperature changing. ... A sphere rotating around its axis. ...

The concept of eddy is often used in phenomenology of turbulence. An ”eddy” of size l can be loosely described as the velocity in the Fourier mode with wave-vector q=1/l. This article is about the philosophical movement. ... In fluid dynamics, turbulence or turbulent flow is a flow regime characterized by chaotic, stochastic property changes. ... Fourier (SAMPA: [fVri:eI]) can mean: Jean Baptiste Joseph Fourier, a French mathematician and physicist. ...

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