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Energy decay of vortices in viscous fluids: an applied mathematics view

Published online by Cambridge University Press:  20 August 2012

Jan Nordström*
Affiliation:
Department of Mathematics, Linköping University, SE-581 83 Linköping, Sweden
Björn Lönn
Affiliation:
Department of Information Technology, Uppsala University, SE-75105 Uppsala, Sweden
*
Email address for correspondence: [email protected]

Abstract

The energy decay of vortices in viscous fluids governed by the compressible Navier–Stokes equations is investigated. It is shown that the main reason for the slow decay is that zero eigenvalues exist in the matrix related to the dissipative terms. The theoretical analysis is purely mathematical and based on the energy method. To check the validity of the theoretical result in practice, numerical solutions to the Navier–Stokes equations are computed using a stable high-order finite difference method. The numerical computations corroborate the theoretical conclusion.

Type
Papers
Copyright
Copyright © Cambridge University Press 2012

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