 06326 Igor Chueshov and Sergei Kuksin
 On the random kickforced 3D NavierStokes equations in a thin
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Nov 10, 06

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Abstract. We consider the NavierStokes equations in the thin 3D domain $T^2\times(0,\epsilon)$, where $T^2$ is a twodimensional torus. The equation is perturbed by a nondegenerate random kickforce. We establish that, firstly, when $\epsilon\ll1$ the equation has a unique stationary measure and, secondly, after averaging in the thin direction this measure converges (as $\epsilon\to0$) to a unique stationary measure for the NavierStokes equation on $T^2$. Thus, the 2D NavierStokes equations on surfaces describe asymptotic in time and limiting in $\epsilon$ statistical properties of 3D solutions in thin 3D domains.
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