Bounds on Kolmogorov spectra for the Navier - Stokes equations

Details Bounds on Kolmogorov spectra for the Navier - Stokes equations Bounds on Kolmogorov spectra for the Navier - Stokes equations

2008-07-28

arxiv.org/abs/0807.4505v2

Physics

Mathematical Physics

26 pages with one figure

Scientific paper

Let $u(x,t)$ be a (possibly weak) solution of the Navier - Stokes equations on all of ${\mathbb R}^3$, or on the torus ${\mathbb R}^3/ {\mathbb Z}^3$. The {\it energy spectrum} of $u(\cdot,t)$ is the spherical integral \[ E(\kappa,t) = \int_{|k| = \kappa} |\hat{u}(k,t)|^2 dS(k), \qquad 0 \leq \kappa < \infty, \] or alternatively, a suitable approximate sum. An argument involking scale invariance and dimensional analysis given by Kolmogorov (1941) and Obukhov (1941) predicts that large Reynolds number solutions of the Navier - Stokes equations in three dimensions should obey \[ E(\kappa, t) \sim C_0\varepsilon^{2/3}\kappa^{-5/3} \] over an inertial range $\kappa_1 \leq \kappa \leq \kappa_2$, at least in an average sense. We give a global estimate on weak solutions in the norm $\|{\mathcal F}\partial_x u(\cdot, t)\|_\infty$ which gives bounds on a solution's ability to satisfy the Kolmogorov law. A subsequent result is for rigorous upper and lower bounds on the inertial range, and an upper bound on the time of validity of the Kolmogorov spectral regime.

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