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vortices    
n. 旋涡

旋涡

Vortex \Vor"tex\, n.; pl. E. {Vortexes}, L. {Vortices}. [L.
vortex, vertex, -icis, fr. vortere, vertere, to turn. See
{Vertex}.]
[1913 Webster]
1. A mass of fluid, especially of a liquid, having a whirling
or circular motion tending to form a cavity or vacuum in
the center of the circle, and to draw in towards the
center bodies subject to its action; the form assumed by a
fluid in such motion; a whirlpool; an eddy.
[1913 Webster]

2. (Cartesian System) A supposed collection of particles of
very subtile matter, endowed with a rapid rotary motion
around an axis which was also the axis of a sun or a
planet. Descartes attempted to account for the formation
of the universe, and the movements of the bodies composing
it, by a theory of vortices.
[1913 Webster]

3. (Zool.) Any one of numerous species of small Turbellaria
belonging to {Vortex} and allied genera. See Illustration
in Appendix.
[1913 Webster]

{Vortex atom} (Chem.), a hypothetical ring-shaped mass of
elementary matter in continuous vortical motion. It was
conveniently regarded in certain early mathematical models
as the typical form and structure of the chemical atom,
but is no longer considered a useful model, having been
superseded by quantum mechanics.

{Vortex wheel}, a kind of turbine.
[1913 Webster PJC]


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  • Formation of Vortices: Reasons Physical Phenomena
    The discussion centers on the formation of vortices, specifically in the context of water draining from a bathtub sink, and the related physical phenomena Participants explore the reasons behind the circular motion of water, the role of pressure differences, and the dynamics of velocity in vortices
  • What causes the formation of vortices in a separated flow?
    Also, I have heard that an inflection point in the velocity profile leads to instability in the flow (i e the flow is unstable to random disturbances) which leads to the production of vortices at higher Re So my question can be split into 2 parts: 1) Why does the velocity gradient lead to vortex formation in the separated flow over a cylinder?
  • fluid dynamics - Why do quantum vortices form in superfluids . . .
    The superfluid can be in a state with zero vortices But if one imparts angular momentum to the superfluid, then the angular momentum is physically expressed either by the superfluid rotating as a whole, or by the presence of vortices In an ordinary fluid vortices can also appear of course, but they get damped away by viscosity
  • Reason for whirls and vortices when pouring milk in tea: Which . . .
    When pouring milk into tea or coffee, one can readily observe finger-like structures with whirls and vortices evolving as the milk flows into the tea or coffee
  • fluid dynamics - How does gravity affect the formation of vortices . . .
    However, in large vortices in water bodies, for example, in a closed water bottle, the centre of water often creates a hole that droops down into the water body, and the vortex forms an upside-down cone shape
  • How Do Vortices Form in Fluid Dynamics? - Physics Forums
    The discussion revolves around the formation of vortices in fluid dynamics, particularly focusing on the Kutta Condition and related concepts such as vorticity and circulation Participants explore theoretical aspects and seek to clarify foundational principles in fluid mechanics One participant expresses interest in understanding how vortices form, mentioning the Kutta Condition but noting a
  • acoustics - How exactly do vortices generate sound and cause pressure . . .
    Vortices are often mentioned as the cause of sound production for things like corrugated whirly tubes, edge tones, etc But I havent seen pictures and descriptions explaining how they cause pressure waves, what is their direction
  • fluid dynamics - Are closed streamlines necessary to have vortices . . .
    I am studying fluid dynamics, and all the examples I have found so far about vortices show closed streamlines rotating around an axis All these examples suggest that having closed streamlines is a necessary condition to have vortices
  • How does a shear layer make vortices? - Physics Stack Exchange
    0 How does a shear layer make vortices? If you have 2 streams of air that are moving at different speeds or opposite directions right beside each other, how does that make a vortex? What causes the rotation, in other words
  • How do the vortices in vortex-induced vibrations (VIV) form?
    This leads to ternary vortices (pointing away from the cylinder) on either side of the cylinder and due to some asymmetric perturbation in velocity this would wash one of the vortices way inducing the vortex shedding I have only simulated flows around cylinders by means of numerical methods





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