2013/09/30 by Ciprian Foias, Ciprian Foiaş, C Foias +6 · 2 citations
Engineering · Mathematics · Physics and Astronomy · #Fluid Dynamics and Turbulent Flows #Navier-Stokes equation solutions #Stability and Controllability of Differential Equations #math.AP #math.DS #msc:34G20 #msc:37L05 #msc:37L25 #msc:76D05 #nlin.CD #physics.flu-dyn
paper · pdf · doi:10.1070/rm2014v069n02abeh004891
arxiv created 2013/11/07 · crossref issued 2014/04/30 · crossref published 2014/04/30 · crossref published-print 2014/04/30 · openalex publication_date 2014/04/30 · crossref published-online 2014/07/08 · crossref created 2014/07/08 · arxiv updated 2015/06/17 · crossref deposited 2025/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01 · crossref indexed 2026/08/01
In this paper we show that the long time dynamics (the global attractor) of the 2D Navier-Stokes equation is embedded in the long time dynamics of an ordinary differential equation, named \it determining form, in a space of trajectories which is isomorphic to C1b(\bR; \bRN), for N large enough depending on the physical parameters of the Navier-Stokes equations. We present a unified approach based on interpolant operators that are induced by any of the determining parameters for the Navier-Stokes equations, namely, determining nodal values, Fourier modes, finite volume elements, finite elements, etc... There are two immediate and interesting consequences of this unified approach. The first is that the constructed determining form has a Lyapunov function, thus its solutions converge, as time goes to infinity, to the set of steady states of the determining form. The second is that these steady states of the determining form are identified, one-to-one, with the trajectories on the global attractor of the Navier-Stokes equations. It is worth adding that this unified approach is general enough that it applies, in an almost straightforward manner, to a whole class of dissipative dynamical systems.