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遇到一个浓度f的运输方程，但是最右侧红框内的这一项，是一个梯度的分量。我本想用fvc::grad().component()，这种形式加入方程里的，但是发现不行。。 或者使用fvc::Su(里面是梯度分量)? 如何得到梯度的分量呢？
fvc::grad().component()
fvc::Su(里面是梯度分量)
我想到了，用fvc:;grad()&vector(0,1,0）求Y向的分量
