March 15, 2024
Journal Article

Feature-adjacent multi-fidelity physics-informed machine learning for partial differential equations

Abstract

Physics-informed neural networks have emerged as an alternative method for solving partial differential equations. However, for complex problems, the training of such networks can still require high-fidelity data which can be expensive to generate. To reduce or even eliminate the dependency on high-fidelity data, we propose a novel multi-fidelity architecture which is based on a feature space shared by the low- and high-fidelity solutions. In the feature space, the projections of the low-fidelity and high-fidelity solutions are adjacent by constraining their relative distance. The feature space is represented with an encoder and its mapping to the original solution space is effected through a decoder. The proposed multi-fidelity approach is validated on forward and inverse problems for steady and unsteady problems described by partial differential equations.

Published: March 15, 2024

Citation

Chen W., and P. Stinis. 2024. Feature-adjacent multi-fidelity physics-informed machine learning for partial differential equations. Journal of Computational Physics 498. PNNL-SA-182880. doi:10.1016/j.jcp.2023.112683

Research topics