一种求解有交界面的椭圆型方程的隐式间断条件差分格式

本文将文献中的求解二维的有交界面的椭圆型方程的浸入界面方法推广到界面及间断条件都由定义在界面某个邻域的网格函数点上的函数隐式提供的情形，给出了一种间断条件捕捉格式。它特别适合干隐式界面跟踪法如水平集方法。对原浸入界面方法中的界面间断关系，确定不规则点差分格式的系数的代数方程组和修正项都针对新的情形进行了相应的修正。该格式利用标准的二阶拉格朗日插值计算间断函数沿界面的导数，避免了文献中的用样条函数的局部界面重构，易于执行。数值计算验证了该法的关于最大模的二阶收敛性。

多孔介质中各向异性渗流问题的界面浸入有限元方法

对刻画多孔介质中各向异性渗流问题的二阶椭圆界面方程提出一种浸入有限元方法．给出的数值算例表明该方法具有对界面问题解的最优阶离散H^1-模和L^2-模收敛精度．

Three Dimensional Interface Problems for Elliptic Equations

The author studies the structure of solutions to the interface problems for second order linear elliptic partial differential equations in three space dimension. The set of singular points consists of some singular lines and some isolated singular points. It is proved that near a singular line or a singular point, each weak solution can be decomposed into two parts, a singular part and a regular part. The singular parts are some finite sum of particular solutions to some simpler equations, and the regular parts are bounded in some norms, which are slightly weaker than that in the Sobolev space H^2.