Physics-informed neural networks allow models to be trained by physical laws described by general nonlinear partial differential equations. However, traditional architectures struggle to solve more challenging time-dependent problems due to their architectural nature. In this work, we present a novel physics-informed framework for solving time-dependent partial differential equations. Using only the governing differential equations and problem initial and boundary conditions, we generate a latent representation of the problem's spatio-temporal dynamics. Our model utilizes discrete cosine transforms to encode spatial frequencies and recurrent neural networks to process the time evolution. This efficiently and flexibly produces a compressed representation which is used for additional conditioning of physics-informed models. We show experimental results on the Taylor-Green vortex solution to the Navier-Stokes equations. Our proposed model achieves state-of-the-art performance on the Taylor-Green vortex relative to other physics-informed baseline models.

本文提出了一种新颖的基于物理信息的神经网络框架，用于解决时间依赖偏微分方程，利用离散余弦变换对空间频率进行编码，再利用循环神经网络处理时间演化，从而实现对问题的时空动态的潜在表达，提高了物理相关模型的效率和灵活性，并在Navier-Stokes方程的Taylor-Green涡旋解上实现了最先进的性能。

基于物理信息的RNN-DCT网络用于时间依赖偏微分方程