LS_DYNA进行爆炸和电磁的耦合仿真时，结果不收敛，怎么解决？

       1 t 0.0000E+00 dt 9.65E-08 flush i/o buffers            02/25/19 19:55:40
       1 t 0.0000E+00 dt 9.65E-08 write d3plot file            02/25/19 19:55:40
       1 t 0.0000E+00 dt 1.00E-08 electromagnetism step

 *** Warning 60124 (IMP+124)
     141 negative eigenvalues detected
EM-BEM implicit iteration #  1,ah= 0.0000000E+00,%v= 0.0000000E+00,ks= 0.3513162E+07,%v= 0.1000000E+01,mf2It    1,tot     1
EM-BEM implicit iteration #  2,ah= NaN          ,%v= NaN          ,ks= NaN          ,%v= NaN          ,mf2It    1,tot     2
EM-BEM implicit iteration #  3,ah= NaN          ,%v= NaN          ,ks= NaN          ,%v= NaN          ,mf2It    1,tot     3

EM-BEM implicit iteration # 51,ah= NaN          ,%v= NaN          ,ks= NaN
 EM error: the EM FEM-BEM solver did not converge
 Please try to reduce the EM time step
       1 t 9.6491E-08 dt 1.00E+06 write d3plot file            02/25/19 19:56:18
       1 t 9.6491E-08 dt 1.00E+06 write d3plot file            02/25/19 19:56:18

 E r r o r   t e r m i n a t i o n                             02/25/19 19:56:18