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Results tagged with turbulence
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user 77435
A regime of nonlinear viscous flow characterized by random, rotational motion with a wide range of length scales. Its study is critical to many fields, such as aerospace, atmospheric science, chemical engineering, and astrophysics.
2
votes
1
answer
72
views
Turbulence: a state, a property, a structure?
The term "turbulence" ("turbulent" etc.) appears in many phrases from an ordinary technical description to apparent parables. … I am aware of the concept of transition and fully developed turbulence. Again, I aim for the terminology. …
- 2,834
2
votes
1
answer
778
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Plane landing into a tunnel
Typical action movies cliché is landing a plane in a tunnel or even a flight in a tunnel. Let's drop any doubts about supreme heroic piloting skills of the characters etc. and focus on aerodynamics.
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1
vote
1
answer
410
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Does surface tension attenuate turbulence?
Rapids and several other "white water" systems could be typical examples of turbulent motion. To describe such flows the Navier-Stokes equations must be extended by terms describing the surface tensio …
- 2,834
4
votes
2
answers
3k
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Ways to compute the turbulent velocity kinetic energy spectrum
The implicit definition of the kinetic energy spectrum $\hat{E}_k$ of the turbulent flow is simply:
$$
E = \int \hat{E}(k) \mathrm{d}k
$$
I have found the definition using Fourier transform of a two …
- 2,834
3
votes
1
answer
594
views
Physical intuition on vortex sound generation
Whenever a fluid has a nonzero vorticity, it looses some of its energy in a form of sound wave. Formally is this mechanism described by Lighthill's equation or some related model (like e.g. Curle's th …
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2
votes
1
answer
15k
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What is actually the characteristic length in fluid dynamics description?
In many fluid-dynamics models and quantities (Reynolds number, Strouhal number... generally various turbulent flow descriptions) there is a parameter (usually $L$ or $\ell$) descripted as characterist …
- 2,834
7
votes
1
answer
149
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How to popularly describe typical features of a "non-linear system"
I need this for a popular lecture about fluid dynamics and turbulence. My aim is not to use sentences like "We have here a highly non-linear flow" without explaining or exemplifying the term. …
- 2,834