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请教大家一个问题， 我正在用twofluidmodel计算solid-water flow。但是我们有自己的模型，需要在原有的基础上改写代码，将solid的effictive visicosity等于water的。其中有一个phasepressure model，可以在这里面改写phase2.nueff_, 并且包含一些header文件，但是我这样写了之后，提示没有declaration。请问怎么解决这个问题呢？
