Combination of polynomial chaos and Kriging for reduced-order model of reacting flow applications

• Main Authors: Gianmarco Aversano, Giuseppe D’Alessio, Axel Coussement, Francesco Contino, Alessandro Parente
• Format: Article
• Language: English
• Published: Elsevier 2021-06-01
• Series: Results in Engineering
• Subjects: PCA; Surrogate models; Polynomial chaos; Kriging
• Online Access: http://www.sciencedirect.com/science/article/pii/S2590123021000244

The combination of Proper Orthogonal Decomposition (POD) with Kriging has been shown to be a reliable choice for the development of Reduced-Order Models (ROMs) for the prediction of combustion data at unexplored operating conditions. In this study, POD is combined with Polynomial Chaos Expansion (PCE), with a combination of PCE and Kriging (PC-Kriging) and with Artificial Neural Networks (ANN) for the development of a ROM that can predict 2D combustion data for unexplored operating conditions. The choice of Non-negative Matrix Factorization (NMF) instead of POD as compression method is also investigated. This method is chosen because it can intrinsically guarantee the non-violation of physical constraints such as positivity of chemical species mass fractions, although POD's data reconstruction errors are lower. The performances of the POD and NMF in combination with the proposed supervised methods are compared, with prediction normalized root mean squared errors (NRMSE) being less than 10% for spatial fields of temperature, CH4 and O2 for all approaches.