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@ykk 方法自然是合适的，但是你需要确定你算的是对的，边界条件、数值格式啥的，而且瞬态模拟时间步长也需要关注。
我比较好奇的是你是做了这种工况下的实验观测到了运动趋于平稳吗，有没有可能它就是不平稳呢？
