On the rate of convergence of the two-dimensional $α$-models of turbulence to the Navier-Stokes equations

Details On the rate of convergence of the two-dimensional $α$-models of turbulence to the Navier-Stokes equations On the rate of convergence of the two-dimensional $α$-models of turbulence to the Navier-Stokes equations

2009-02-24

arxiv.org/abs/0902.4247v2

Physics

Mathematical Physics

29 pages

Scientific paper

Rates of convergence of solutions of various two-dimensional $\alpha-$regularization models, subject to periodic boundary conditions, toward solutions of the exact Navier-Stokes equations are given in the $L^\infty$-$L^2$ time-space norm, in terms of the regularization parameter $ \alpha$, when $\alpha$ approaches zero. Furthermore, as a paradigm, error estimates for the Galerkin approximation of the exact two-dimensional Leray-$\alpha$ model are also presented in the $L^\infty$-$L^2$ time-space norm. Simply by the triangle inequality, one can reach the error estimates of the solutions of Galerkin approximation of the $\alpha$-regularization models toward the exact solutions of the Navier-Stokes equations in the two-dimensional periodic boundary conditions case.

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