Different approaches are discussed of variational principles characterizing coherent vortex structures in two-dimensional flows. Turbulent flows seem to form ordered structures in the large scales of the motion and the self-organization principle predicts asymptotic states realizing an extremal value of the energy or a minimum of enstrophy. On the other hand the small scales take care of the increase of entropy, and asymptotic results can be obtained by applying the theory of equilibrium statistical mechanics.
|Number of pages||5|
|Journal||Applied scientific research|
|Publication status||Published - 1993|
|Event||4th European Turbulence Conference, ETC IV 1992 - Delft, Netherlands|
Duration: 30 Jun 1992 → 3 Jul 1992
Conference number: 1992