A counterexample to the smoothness of the solution to an equation arising in fluid mechanics

Details A counterexample to the smoothness of the solution to an equation arising in fluid mechanics A counterexample to the smoothness of the solution to an equation arising in fluid mechanics

2001-06-13

arxiv.org/abs/math/0106113v2

Commentationes Mathematicae Universitatis Carolinae, 43, 1, (2002), 61-75

Mathematics

Analysis of PDEs

Also available at http://www.math.missouri.edu/~stephen/preprints/ - This version has small corrections

Scientific paper

We analyze the equation coming from the Eulerian-Lagrangian description of fluids. We discuss a couple of ways to extend this notion to viscous fluids. The main focus of this paper is to discuss the first way, due to Constantin. We show that this description can only work for short times, after which the ``back to coordinates map'' may have no smooth inverse. Then we briefly discuss a second way that uses Brownian motion. We use this to provide a plausibility argument for the global regularity for the Navier-Stokes equation.

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