Fluid mechanics is a fundamental field in engineering and science. Solving the Navier-Stokes equation (NSE) is critical for understanding the behavior of fluids. However, the NSE is a complex partial differential equation that is difficult to solve, and classical numerical methods can be computationally expensive. In this paper, we present an innovative approach for solving the NSE using Physics Informed Neural Networks (PINN) and several novel techniques that improve their performance. The first model is based on an assumption that involves approximating the velocity component by employing the derivative of a stream function. This assumption serves to simplify the system and guarantees that the velocity adheres to the divergence-free equation. We also developed a second more flexible model that approximates the solution without any assumptions. The proposed models can effectively solve two-dimensional NSE. Moreover, we successfully applied the second model to solve the three-dimensional NSE. The results show that the models can efficiently and accurately solve the NSE in three dimensions. These approaches offer several advantages, including high trainability, flexibility, and efficiency.

本篇论文提出了基于物理信息神经网络（PINN）的新方法，该方法的第一种模型假定速度分量由流函数的导数近似，第二种更为灵活，对两个维度的NSE有有效解决办法，并成功应用于求解三维NSE，这些方法具有高训练性、灵活性和高效性。

EPINN-NSE：用于求解 Navier-Stokes 方程的增强型物理启发式神经网络