# Explain Turbulence [closed]

I'm a high school student. I still don't understand what turbulence is. Please can you explain what it really is? This is what I think it is: rotating motion of water when a particle travels at a velocity of $V$.

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Are you referring to the layman term "turbulence" like you would encounter in an aircraft or the actual turbulence that is studied in fluid dynamics (which are related but the first is actually answerable here while the second is too broad to answer -- there's countless books dedicated to only turbulence) –  tpg2114 Jan 14 at 20:17
A little search could be usefull: en.m.wikipedia.org/wiki/Turbulence –  user689 Jan 14 at 20:18
It is too complicated for me to understand! Please summarise! :/ –  Arjun Nagarajan Jan 14 at 20:25
Any flow which is not laminar is turbulent (if you ignore the transition phase) –  Pranav Hosangadi Jan 14 at 22:58

## closed as too broad by tpg2114, Brandon Enright, Kyle Kanos, ja72, dmckee♦Jan 15 at 0:43

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

Turbulence isn't only about water, it is about fluids in general.Flow can be divided into three types : laminar, transitional and turbulent.The turbulent flow occurs when the fluid is flowing fast and the laminar when it is flowing slowly.

In laminar flow the motion of the particles of fluid is very orderly with all particles moving in straight lines parallel to the pipe walls. In turbulent flow the particles move in a rotating motion. Actualy, velocity itself is just one of the factors that affect the flow of a fluid, for that a relation between the factors (density, diameter of the pipe and velocity.) is summed up by a the Reynolds number: if it is less than 2300 the flow would be laminar, if it is greater than 4000 the flow would be turbulent and if it is in between the flow is transitional. And here is a simple guide with diagrams: http://www.efm.leeds.ac.uk/CIVE/CIVE1400/Section4/laminar_turbulent.htm

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Why the downvote? –  user689 Jan 14 at 20:47
Riemann number? Surely you mean Reynolds number –  Kyle Kanos Jan 14 at 21:08
Yes you are right! –  user689 Jan 15 at 5:28

To give a definition of turbulence is hard, and every aspect of turbulence is controversial, but there are some essential elements:

Turbulence requires the presence of vorticity.

Turbulent flow has a very complex structure, involving a broad range of space and time scales.

Turbulent flow fields exhibit a high degree of apparent randomness and disorder. However, close inspection often reveals the presence of embedded coherent flow structures.

Turbulence is chaotic.

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