| 日時： |
2006年11月13日（月） 14:30〜15:30 |
| 場所： |
京都大学 工学部物理系校舎 2階 211会議室 |
| 講演者： |
Dr Lennaert van Veen (La Trobe University, Melbourne, Australia) |
| 講演題目： |
Cycles of short and long period in weak isotropic turbulence |
| 講演要旨： |
In previous work with Shigeo Kida and Genta Kawahara we showed that a single periodic orbit can capture many of the features of isotropic turbulence in a range of values of the microscale Reynolds number. The orbit we studied has a period of about two to three times the large-eddy turnover time. We also looked at orbits of shorter period but found that these represent turbulence only at low Reynolds number. These results suggest that there is a minimal period for orbits that represent developed turbulence. However, we later found contradictory results when studying orbits of longer period. If the application of periodic orbit theory to turbulence is to be of practical importance we need rules for the selection of suitable orbits. The work I will present is a first step in this direction and draws on intuitively clear predictions made on the basis of statistical physics. |
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