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Shock and Vibration
Volume 9, Issue 3, Pages 105-121
http://dx.doi.org/10.1155/2002/540189

In-Situ Residual Tracking in Reduced Order Modelling

Joseph C. Slater,1 Chris L. Pettit,2 and Philip S. Beran2

1Wright State University, Dayton, OH 45435, USA
2Wright-Patterson Air Force Base, OH 45433, USA

Received 22 August 2001; Revised 17 September 2001

Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Proper orthogonal decomposition (POD) based reduced-order modelling is demonstrated to be a weighted residual technique similar to Galerkin's method. Estimates of weighted residuals of neglected modes are used to determine relative importance of neglected modes to the model. The cumulative effects of neglected modes can be used to estimate error in the reduced order model. Thus, once the snapshots have been obtained under prescribed training conditions, the need to perform full-order simulations for comparison is eliminates. This has the potential to allow the analyst to initiate further training when the reduced modes are no longer sufficient to accurately represent the predominant phenomenon of interest. The response of a fluid moving at Mach 1.2 above a panel to a forced localized oscillation of the panel at and away from the training operating conditions is used to demonstrate the evaluation method.