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这几句代码啥意思，起到什么作用，看不明白
设定压力参考值。对于不可压缩流体，如果压力边界条件都是零法向梯度的话，方程无解，因此需要给定一个参考值。
http://dyfluid.com/potentialFoam.html 方程3
@李东岳 好的谢谢您，李老师
