The equations are solved by finite difference method and the mean and variance of pressure head are determined from its random expression. 通过摄动方法得到一系列关于水头展开式的偏微分方程,用有限差分法进行求解,获得了压力水头的随机描述,并计算其均值和方差。
Comparison of the finite difference expression with the multiresolution expression for the second derivation 二阶导数的小波多分辨表示与有限差分表示比较
The FDTD algorithm is based on the finite difference expression of the set of Maxwell's time-dependent curl equations. FDTD算法的基本点是将Maxwell方程组的时变的旋度方程用差分形式来表述。