NS方程求解-PointNet和升维思想（效果很差）

PointNet求解NS方程参考文献：Kashefi, A. , and T. Mukerji . “Physics-Informed PointNet: A Deep Learning Solver for Steady-State Incompressible Flows and Thermal Fields on Multiple Sets of Irregular Geometries.” (2022).PointNet网络的特点在于中间通过pool提取过一次全局特征，这个特点导致一个问题。