The saturation equation was solved using an explicit total variation diminishing (TVD) method.
应用显式全变差递减（TVD）法求解了饱和度方程。
A new algorithm, locally twitch finite element method is developed on the base of the general finite element method, mixed with total-variation-diminishing (TVD) scheme and the finite volume method.
局部隐式有限元法是在一般有限元法的基础上，兼容了TVD差分格式和有限体积法的某些特点，形成的一种新型算法。
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