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主要计算问题为波浪与结构物相互作用问题，想请教一下，我在结构物表面设置几个点用来检测压强随时间变化，但是在初始压强数据中出现负数（刚开始计算，波浪还没有作用于结构物上），为什么初始阶段压强会出现负值？