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流域里是有流体的，球受到的阻力也是随速度增大的。从静止下降1s后对称面上的压力分布如下图所示，球的直径是1m。等有时间了会做个与正常6DOF模拟（就是让网格变形那种的对比）的对比。20200722114110.png
