Due to lack of understanding of precise underlying mechanisms, turbulent flow in liquids, gases and powders (etc) cannot be exactly described.
This can be very significant when attempting to predict the behaviour of complex natural phenomena - weather systems for example. Or when making predictions about dynamic forces and frictions in turbulences around man-made tech such as aircraft, ships, turbines etc. etc..
In addition, there is, as yet, no solid theorem relating Reynolds Numbers (a measure used to assess and predict fluid flow patterns in different situations) to turbulence.
Quote from: Prof. Richard Feynman - â€śTurbulence is the most important unsolved problem of classical physics.â€ť (Feynman R., Leighton R. B., Sands M. (1964) The Feynman lectures on physics)
Quote from: Sir Horace Lamb - â€śI am an old man now, and when I die and go to heaven there are two matters on which I hope for enlightenment. One is quantum electrodynamics, and the other is the turbulent motion of fluids. And about the former I am rather optimistic.â€ť (in a speech to the British Association for the Advancement of Science in 1932)
Source : Transactions of the Royal Society A
Ideas for new topics, and suggested additions / corrections for older ones, are always welcome.
If you have skills or interests in a particular field, and have suggestions for Wikenigma, get in touch !
Or, if you'd like to become a regular contributor . . . request a login password. Registered users can edit the entire content of the site, and also create new pages.
( The 'Notes for contributors' section in the main menu has further information and guidelines etc.)
You are currently viewing an auto-translated version of Wikenigma
Please be aware that no automatic translation engines are 100% accurate, and so the auto-translated content will very probably feature errors and omissions.
Nevertheless, Wikenigma hopes that the translated content will help to attract a wider global audience.