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January 15, 2014, 08:22 
Mathematician claims he has solved the NS Eqs

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http://www.spiegel.de/wissenschaft/m...a943228.html
The article is in German. It says that a mathematician from Kazakhstan (Muchtarbai Otelbajew) has published a 100page paper on the existence of strong solutions for the NS equations. The paper is written only in Russian for the moment. Exaggerated claims from the journal perhaps (or the mathematician)? Or are we all out of work? ;) 

January 15, 2014, 08:37 

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Bruno Santos
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I'm not a specialist in CFD, far from it.
But from what I've learned so far (only bits and pieces ), it's always been known that strong solutions for the NS equations do exist, but they are computationally too heavy to solve them directly. 

January 15, 2014, 09:31 

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garry
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I also have a question whether the DNS is precise for CFD, and if DNS is precise with the only problem of must be in super computera seemingly easy solved problem, why people still research LES...?


January 15, 2014, 09:40 

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Alex
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Even if this claim turns out to be true, dont worry about unemployed CFD engineers
Basically it only means that what we have been doing for the last decades (numerically solving equations derived from the NS equations) was not entirely wrong. Quote:


January 15, 2014, 10:13 

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Quote:
Here there is an article about the author of solution in English: http://bnews.kz/en/news/post/180213/. The only millenium problem solved sofar is the Poincare Problem (solved by G. Perelman who rejected 1000000 $ prise from the Clay Institute). I do not know if the claim about NS problem is serious. Will wait until experts will say their word about this work. 

January 15, 2014, 17:05 

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Filippo Maria Denaro
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January 15, 2014, 18:16 

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I found a thread on the same topic in the same forum posted several days ago:
N.V Solution Mujtarbay Otelbayev ? It is interesting that the Clay Institute page never mentions word "Turbulence", they talk about existence of smooth solution only. It is interesting are there any direct and useful link (something like Kolmogorov theory) between problem of existence and description of turbulence. 

January 16, 2014, 05:42 

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Filippo Maria Denaro
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Quote:
well, maybe the direct link is the existence of the strong solution that would ensure the fact that turbulence is governed by a strong solution of NS equations? 

January 16, 2014, 14:13 

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So, does that means that all possible singularities (at smooth initial data) die in the framework of incompressible NS at Kolmogorov scale, without need to modify equations to compressible, or nonlinear stress etc.
BTW, is the problem for the compressible NS more complicated? P.S. I found partial English translation of Otelbaev's article here https://github.com/myw/navier_stokes_translate 

January 16, 2014, 14:30 

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Filippo Maria Denaro
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the compressible form of the NS enters into thermodinamic issues and I think that finding an existence and regularity proof of the solution is a very different matter....


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