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「150 Years of Vortex Dynamics」
平成20年7月23日(水) 14:30〜16:00
電気通信大学 東4号館 8階 AV会議室
Helmholtz's great paper of 1858 founded the field of vortex dynamics.The field is, thus, 150 years old and has by now taken on a life of itsown. In particular, the various models of discrete vortices, stimulatedin part by analytical convenience and in part by observations of closephysical realizations in superfluids and plasmas, have spawned a largeliterature. They give a "particle dynamics flavor" to many subjects influid mechanics that are otherwise treated exclusively by fieldtheoretic approaches. While the discrete vortices used for modeling arenot always terribly realistic from the point of view of real fluids,they allow results to be obtained that could hardly be obtained in anyother way. The talk will give examples of such insights and willhighlight a number of problem areas of current interest.