（1）.Automatic stabilization

(2).Unsymmetric solver

(3).General solution controls(成倍地增加5-10)

（4）.Contact controls(数值采用默认就可以)

（5）.Contact property

（6）use surface to surface finite sliding (7) apply a small friction (0.02)

15.按照步数来查看结果

16.对称算法与非对称算法