Joint Spatiotemporal Spectral Neural Operators for Learning PDEs on Irregular Domains

2026-08-30

AI Summary

该研究提出图谱神经算子(GSNO)解决非规则域上偏微分方程(PDEs)的学习问题，通过结合空间图谱分解与时间傅里叶变换，无需域扭曲或自回归展开。

Abstract

Learning solution operators for partial differential equations (PDEs) on irregular and geometry-dependent domains remains a central challenge in scientific machine learning. While spectral methods provide strong inductive biases for modeling global interactions, they are typically limited to regular domains, and existing neural approaches often require domain warping, interpolation, or costly geometric embeddings. We introduce the \textbf{Graph Spectral Neural Operator (GSNO)}, a neural operator that combines spatial graph spectral decompositions with temporal Fourier transforms through a unified space--time spectral kernel. This formulation enables globally coherent operator learning on non-Cartesian discretizations without domain warping or autoregressive rollouts. By replacing learned geometric embeddings with a graph Laplacian spectral basis, GSNO provides geometry-aware spectral learning with low parameter complexity. Across steady and unsteady PDE benchmarks on irregular and geometry-dependent domains, GSNO achieves strong accuracy with reduced runtime and parameter counts, while demonstrating robust zero-shot generalization across mesh resolutions and geometry families.

Problem

• partial differential equations
• irregular domains
• geometry-dependent domains
• scientific machine learning

Innovation

• Graph Spectral Neural Operator
• spatiotemporal spectral kernel
• irregular domains
• geometry-aware learning
• low parameter complexity