体积守恒 meaning in English

volume conservation

There is a linear relation of the logarithm between the pressure difference in round seepage flow region and the radius , for the same accuracy , it is better to select a center mesh grid that is a isometry system with inr interval
模型离散化时必须满足流量、体积守恒。圆形渗流区域内的压力差随半径是对数的线性关系，为保证相同计算精度，选择对lnr来说等距的中心网格系统。