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树的那个一看就想到马蹄涡，还有图四那个，好像也是涡形成的，类似于飞机机翼两端的翼尖涡。突然感觉自己cfd不行，流体力学还挺扎实
连续性方程是双曲型方程，还是椭圆型方程
利用傅里叶变换，数理方程书上有
