Talk:D'Alembert's paradox
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What about the Superfluidity experiments on 4He? While "no drag" has not been observed, most other non-viscous elements have been observed, including no vortexes and no temperature hotspots.
This article is more or less incomprehensible to the layman, unfortunately. I think what's needed is an opening section that explains in non-mathematical terms what the paradox is, and what it means in practice, and what its consequences for the field of fluid dynamics were. While what's there is no doubt of value for the more enthusiastic or technical reader, at present it is not terribly useful in a general purpose encyclopedia. Graham 02:20, 18 August 2005 (UTC)
Yes, I agree. I have no idea what the bits of mathematical logic have to do with d'Alembert's paradox. I thought it had to do with zero drag in inviscid flow.
You have correctly stated the crux of the paradox. Invisid fluids do exhibit drag but the bits of mathematical logic in the peice show that this set of very useful equations predict that they will not. Yet the equations are properly derived and make useful predictions about real fluids behavior.
I found this page very very helpful - In fact I believe I may have derived a solution to the paradox. If I am correct it will be an important acheivement. I have written up my thoughts in a small article and I will be seeking to have this work published in an appropriate journal. In all events I will soon publish my thoughts here as well. Many thanks to the author of this article.
Sincerly,
Tony Gallistel A. Gallistel Innovation tgallist@aol.com
Sorry to break your bubble, but the paradox has already been "solved". It is even a matter of opinion whether this is a paradox at all. It is thought to be one because we expect to have drag when an object is in a moving fluid from our everyday life experience, yet the theory predicts that there is none. However, we can't blame a set of equations which are based on big assumptions (inviscid) for not representing the exact physical model and call the result paradoxal! it's like assuming that if gravity is neglected, a ball which is thrown accross a room will travel in a straight line, then carrying the experiment and finding out that it does not (although part of the result is still correct: the x velocity will be the same in both cases. Just like part of the result of assuming inviscid can still be correct)
