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这其实是个常见问题。按我的理解,不是Courant Number突然变大很多倍导致模拟发散,而是速度求解先崩掉了导致Courant Number跟着增大,然后速度就更崩了,然后恶行循环。从崩溃的时间步往前看日志,应该能观察到Courant Number持续增大。