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《the finite volume method in CFD...with OpenFOAM》书中116页关于四阶精度的辛普森积分,其变量分布假设是四阶精度,那么其梯度不应该至少是三阶精度吗?书中写的梯度是最少二阶精度。。大神们能给小白解释一下吗??
如果梯度是二阶,乘以5.33右边第三项之后不就是$\frac{1}{2}(x-x_c)^3+...$,然后5.33不就是四阶精度了么?主要产生于相乘。不知道文中是不是这个意思
@东岳 梯度应该是乘5.33右边第二项吧?二阶精度的梯度乘5.33不就是 o(x^2)*x=o(x^3), 既5.33成3阶精度了。或是我对梯度精度的表达式理解有错?
看起来是的,找了下资料没看出来理由,看看大家什么看法?
倒是发现一篇0阶精度的文章..一会发个CFD界