On some dyadic models of the Euler equations

Details On some dyadic models of the Euler equations On some dyadic models of the Euler equations

2004-10-17

arxiv.org/abs/math/0410380v2

Mathematics

Analysis of PDEs

10 pages, submitted to AMS Proc. v2: slight generalization of formula (31) and Theorem 1 (wavenumber mu=lambda>1 and mu=2, ins

Scientific paper

Katz and Pavlovic recently proposed a dyadic model of the Euler equations for which they proved finite time blow-up in the $H^{3/2+\epsilon}$ Sobolev norm. It is shown that their model can be reduced to the dyadic inviscid Burgers equation where nonlinear interactions are restricted to dyadic wavenumbers. The inviscid Burgers equation exhibits finite time blow-up in $H^{\alpha}$, for $\alpha \ge 1/2$, but its dyadic restriction is even more singular, exhibiting blow-up for any $\alpha > 0$. Friedlander and Pavlovic developed a closely related model for which they also prove finite time blow-up in $H^{3/2+\epsilon}$. Some inconsistent assumptions in the construction of their model are outlined. Finite time blow-up in the $H^{\alpha}$ norm, with $\alpha > 0$, is proven for a class of models that includes all those models. An alternative shell model of the Navier-Stokes equations is discussed.

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