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Decay Results of the Nonstationary Navier–Stokes Flows in Half-Spaces

Decay Results of the Nonstationary Navier–Stokes Flows in Half-Spaces There is a long standing problem on the nonstationary Navier–Stokes equations which pertains to how to characterize the L 1−time asymptotic expansion of the Navier–Stokes flows in the half space. Beyond a few partial results, new progress has not yet to be made on this open question. In this article, we give a confirmed answer to this problem; namely, a thorough characterization on L 1−summability is revealed. In order to prove this result, we need to avoid the unboundedness of the projection operator, which is overcome by treating an elliptic Neumann problem. Finally, using the weighted estimates on the heat kernel’s convolution, we obtain the exact profile structure of the asymptotic expansion in $${L^1(\mathbb{R}^n_+)}$$ L 1 ( R + n ) . In addition, some crucial estimates on the fractional spatial derivatives of the non-stationary Stokes and Navier–Stokes flows are established for the first time, which allows for a better understanding of the L 1−decay problem. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archive for Rational Mechanics and Analysis Springer Journals

Decay Results of the Nonstationary Navier–Stokes Flows in Half-Spaces

Archive for Rational Mechanics and Analysis , Volume 230 (3) – Jun 1, 2018

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References (42)

Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Physics; Classical Mechanics; Physics, general; Theoretical, Mathematical and Computational Physics; Complex Systems; Fluid- and Aerodynamics
ISSN
0003-9527
eISSN
1432-0673
DOI
10.1007/s00205-018-1263-z
Publisher site
See Article on Publisher Site

Abstract

There is a long standing problem on the nonstationary Navier–Stokes equations which pertains to how to characterize the L 1−time asymptotic expansion of the Navier–Stokes flows in the half space. Beyond a few partial results, new progress has not yet to be made on this open question. In this article, we give a confirmed answer to this problem; namely, a thorough characterization on L 1−summability is revealed. In order to prove this result, we need to avoid the unboundedness of the projection operator, which is overcome by treating an elliptic Neumann problem. Finally, using the weighted estimates on the heat kernel’s convolution, we obtain the exact profile structure of the asymptotic expansion in $${L^1(\mathbb{R}^n_+)}$$ L 1 ( R + n ) . In addition, some crucial estimates on the fractional spatial derivatives of the non-stationary Stokes and Navier–Stokes flows are established for the first time, which allows for a better understanding of the L 1−decay problem.

Journal

Archive for Rational Mechanics and AnalysisSpringer Journals

Published: Jun 1, 2018

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