论文摘要
Bernardi-Maday-Patera在(1993)[3]中引入的mortar有限元法在设计复杂的结构部分(如机翼和机身)时特别有用,因为这些复杂结构常常有不同的分析师来进行建模,这需要分别建立独立的区域。此时,把这些不同部分的网格协调地结合起来往往很麻烦,甚至是不可能的,因此我们需要寻求非协调的(mortar)技术为来解决这个问题。这些技术对其他情况,如在局部区域上(如在角点附近,这是在所有问题中误差影响最大的地方)的离散需要被加密的时候,也有重要的应用。此外,也可以在不同的区域内部独立计算,忽略在不同区域边界上的连续问题,引进Lagrange乘子,这是推广mortar有限元方法的一种技巧。 粘性不可压流在实际应用中很有价值。例如,在水压泵的设计中就需要研究粘性不可压流的性质,而流变复流在很多过程中(诸如塑料或金属熔化等)大量出现。本文只考虑最简单的不可压稳态Stokes问题。 在第一章中我们对于Stokes问题的mortar有限元法给出了mortar P1非协调元逼近方法,证明了离散的inf-sup条件成立,并得到较优的误差估计。同时我们也给出了相应的多重网格法,证明了W循环的收敛性,即收敛速度与网格大小无关。 在第二章中我们应用了mortar有限元法的推广技术,忽略速度在不同区域边界上的连续,引进与P1非协调元相应的Lagrange乘子空间。用杂交的有限元变分形式来处理Stokes问题,从而证明了两个inf-sup条件成立,并得到相应的误差估计。
论文目录
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