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China claims supercomputer crown

Another usage for supercomputers has traditionally been simulating nuclear explosions.

Since testing is now banned by most major countries, simulation is the only way governments can determine the effect of a nuclear blast.

That is why, as pcAnywhere pointed out, the US government own quite a few. A lot of them are owned by the US Department of Energy, which is responsible for the nuclear stockpile.
 
Official list published...

http://www.theregister.co.uk/2010/11/14/top_500_super_ranking_nov_2010/

A lot of its is CFD - computational fluid dynamics - which is seeing how fluids (air, water, oil etc) move and react to whats around them - e.g. designing formula 1 cars for minimum drag and maximum downforce etc - since they are also banned from testing, its all CFD now.
 
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Wow, this thread has been risen from the dead then. But yeah, the Titan is now the world's most powerful supercomputer and it is used mainly for computationally intensive physics - I know of one project going ahead this year which involves modelling a supernova by crunching through billions of numbers and calculations representing the properties of each and every neutrino involved in the supernova.
 
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