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case中pressure-outlet-7的p边界条件为固定值边界,但利用Info<<fvc::grad(p)<<endl将fvc::grad(p)输出,pressure-outlet-7的边界条件发生了变化,变为了zerogradient,这是为什么呢?
fvc::grad(p)是利用面上压力算的,对零梯度边界条件,在第一次计算,动量预估步时,面上的压力p是怎么得到的?
零梯度边界,边界上的值一直等于相邻网格单元的值。