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标准的限制方法是保证插值后网格顶点（vertice）的值不会出现极大值或极小值（比周围网格的最大值大或比周围网格的最小值小）因为梯度插值最容易出现越界值的就是在顶点处，从而用一个标量来scale梯度gradient；另外一种方法是保证网格的面心midponts of cell faces处不出现极大值或极小值即可，就认为满足了插值后不存在越界的问题。我想的是关于第二种方法，面心处插值后不出现最大值或最小值不能代表顶点处不出现最值，对吗