title: Optimal prediction and the rate of decay for solutions of the Euler equations in two and three dimensions.
abstract: The "t-model" for dimensional reduction is applied to the estimation of the rate of decay of solutions of the Burgers equation and of the Euler equations in two and three space dimensions. The model was first derived in a statistical mechanics context, but here we analyze it purely as a numerical tool and prove its convergence. In the Burgers case, the model captures the rate of decay exactly, as was previously shown. For the Euler equations in two space dimensions, the model preserves energy as it should. In three dimensions, we find a power law decay in time and observe a temporal intermittency.
authors.affiliation: Department of Mathematics, University of California and Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. hald@math.berkeley.edu
authors.forename: Ole H
authors.initials: OH
authors.lastname: Hald
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Stinis
mesh_terms: D003198:Computer Simulation; D015233:Models, Statistical; D008962:Models, Theoretical; D012212:Rheology / Q000379:methods / Q000639:trends