该程序为图形学中流体领域的大牛Jos stam于2003年公开发布的一个关于流体求解程序，其中就包含其半拉格朗日算法的实现。该程序为二维，相信读者拓展到三维是很容易的。-The program for the graphics in the field of fluid Daniudi Jos stam in 2003 published a fluid solver, which contains the semi-Lagrangian algorithm implementation. The program for two-dimensional, three-dimensional extended to trust the reader is very easy.