Non-intrusive Learning of Physics-Informed Spatio-temporal Surrogate for Accelerating Design
High-fidelity multiphysics simulations are computationally expensive, while purely data-driven surrogate models often suffer from limited generalization capabilities. To address this challenge, this work proposes a non-intrusive physics-informed spatiotemporal surrogate modeling framework (PISTM) that leverages a Koopman autoencoder to learn the intrinsic spatiotemporal dynamics of the system. By embedding physical constraints without modifying the original simulation code, PISTM significantly enhances out-of-distribution generalization to unseen operating conditions. Integrating principles from physics-informed neural networks and spatiotemporal dynamical systems modeling, the method is validated on the two-dimensional incompressible flow past a cylinder, demonstrating its ability to accurately and efficiently replace high-fidelity simulations and substantially accelerate engineering design workflows.