We leverage Physics-Informed Neural Networks (PINNs) to learn solution functions of parametric Navier-Stokes Equations (NSE). Our proposed approach results in a feasible optimization problem setup that bypasses PINNs' limitations in converging to solutions of highly nonlinear parametric-PDEs like NSE. We consider the parameter(s) of interest as inputs of PINNs along with spatio-temporal coordinates, and train PINNs on generated numerical solutions of parametric-PDES for instances of the parameters. We perform experiments on the classical 2D flow past cylinder problem aiming to learn velocities and pressure functions over a range of Reynolds numbers as parameter of interest. Provision of training data from generated numerical simulations allows for interpolation of the solution functions for a range of parameters. Therefore, we compare PINNs with unconstrained conventional Neural Networks (NN) on this problem setup to investigate the effectiveness of considering the PDEs regularization in the loss function. We show that our proposed approach results in optimizing PINN models that learn the solution functions while making sure that flow predictions are in line with conservational laws of mass and momentum. Our results show that PINN results in accurate prediction of gradients compared to NN model, this is clearly visible in predicted vorticity fields given that none of these models were trained on vorticity labels.

我们利用物理信息神经网络（PINNs）来学习参数化Navier-Stokes方程（NSE）的解函数，并通过将参数作为PINNs的输入之一，将其与生成的数值解进行训练，以插值出一系列参数的解函数。通过比较不受约束的传统神经网络（NN）和考虑了PDE正则化的PINNs在流体力学预测上的效果，我们证明了我们提出的方法能够优化学习解函数，同时确保流体预测符合质量和动量守恒定律。

使用基于物理信息的神经网络学习参数化Navier-Stokes方程的解