Fluent中用VOF模型求解是出现下面报错，如何解决？

[img][/img]Updating solution at time level N...Global Courant Number : 198.09  done.  iter continuity x-velocity y-velocity          k    epsilon     time/iter!  889 solution is converged   889 6.8850e-04 2.3232e-06 7.0467e-05 6.0568e-04 3.4701e-04  0:00:07   20!  890 solution is converged   890 6.6849e-04 2.2886e-06 7.0289e-05 6.0481e-04 3.4588e-04  0:00:05   19Flow time = 0.02080000005662441s, time step = 1999802 more time stepsUpdating solution at time level N...Global Courant Number : 198.12Error: Global courant number is greater than 250.0. The velocity field is probably diverging. Please check the solution and reduce the time-step if necessary.我的每个时间步长已经减小到0.0001了，10000个时间步长；如果再减小时间步长的话那么计算时间就太长了，我的是二维问题，网格采用四边形，大概有4万个节点。