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A posteriori finite element bounds to linear functional outputs of the three-dimensional Navier-Stokes equations

Title:

A posteriori finite element bounds to linear functional outputs of the three-dimensional Navier-Stokes equations

Cheng, Zhong and Paraschivoiu, Marius (2004) A posteriori finite element bounds to linear functional outputs of the three-dimensional Navier-Stokes equations. International Journal for Numerical Methods in Engineering, 61 (11). pp. 1835-1859. ISSN 0029-5981

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Official URL: http://dx.doi.org/10.1002/nme.1132

Abstract

An implicit a posteriori finite element error estimation method is presented to inexpensively calculate lower and upper bounds for a linear functional output of the numerical solutions to the three-dimensional Navier-Stokes (N-S) equations. The novelty of this research is to utilize an augmented Lagrangian based on a coarse mesh linearization of the N-S equations and the finite element tearing and interconnecting (FETI) procedure. The latter approach extends the a posteriori bound method to the three-dimensional Crouzeix-Raviart space for N-S problems. The computational advantage of the bound procedure is that a single coupled non-symmetric large problem can be decomposed into several uncoupled symmetric small problems. A simple model problem, which is selected here to illustrate the procedure, is to find the lower and upper bounds of the average velocity of a pressure driven, incompressible, steady Newtonian fluid flow moving at low Reynolds numbers through an endless square channel which has an array of rectangular obstacles. Numerical results show that the bounds for this output are rigorous, i.e. always in the asymptotic certainty regime, that they are sharp and that the required computational resources decrease significantly. Parallel implementation on a Beowulf cluster is also reported.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Article
Refereed:No
Authors:Cheng, Zhong and Paraschivoiu, Marius
Journal or Publication:International Journal for Numerical Methods in Engineering
Date:October 2004
Funders:
  • Natural Sciences and Engineering Research Council of Canada
Digital Object Identifier (DOI):10.1002/nme.1132
Keywords:output bounds • Crouzeix-Raviart elements • low Reynolds flows
ID Code:6757
Deposited By: ANDREA MURRAY
Deposited On:05 Jul 2010 17:17
Last Modified:18 Jan 2018 17:29

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