A semi‐continuous formulation for goal‐oriented reduced‐order models: 1D problems. (17th August 2015)

• Record Type: Journal Article
• Authors: Cheng, Lei; Mattei, Stefano; Fick, Peter W.; Hulshoff, Steve J.
• Is Part Of: International journal for numerical methods in engineering. Volume 105:Number 6(2016)
• Page Start: 464
• Page End: 480
• Publication Date: 2015-08-17
• Subjects: reduced‐order models -- POD -- optimisation; Numerical analysis -- Periodicals; Engineering mathematics -- Periodicals; 620.001518
• DOI: 10.1002/nme.4990
• Languages: English
• ISSNs: 0029-5981

Abstract

Summary: A semi‐continuous formulation is introduced for finding bases that minimise the error in a specific output functional of a reduced‐order model. The formulation is advantageous in that it can be used with arbitrary reference data and can be easily applied to nonlinear models and functionals. A general description of the approach is given; then, explicit formulations are derived for the advection‐diffusion and Burgers' equations. Numerical results are given for both linear and nonlinear functionals. These show substantial reductions in error when compared with POD modes, depending on the functional considered. The optimisation of bases for a reduced‐order model using an approximated governing equation is also described, for which large increases in accuracy are obtained relative to POD modes. Copyright © 2015 John Wiley & Sons, Ltd.