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Determination of the solutions of the Navier-Stokes equations by a set of nodal values

Authors: Ciprian Foias and Roger Temam
Journal: Math. Comp. 43 (1984), 117-133
MSC: Primary 35Q10; Secondary 76D05
MathSciNet review: 744927
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Abstract: We consider the Navier-Stokes equations of a viscous incompressible fluid, and we want to see to what extent these solutions can be determined by a discrete set of nodal values of these solutions. The results presented here are exact results and not approximate ones: we show, in several cases, that the solutions are entirely determined by their values on a discrete set, provided this set contains enough points and these points are sufficiently densely distributed (in a sense described in the article). Two typical results are the following ones: two stationary solutions coincide if they coincide on a set sufficiently dense but finite; similarly if the large time behavior of the solutions to the Navier-Stokes equations is known on an appropriate discrete set, then the large time behavior of the solution itself is totally determined.

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