研究对流扩散方程的时空间断Galerkin有限元方法,该方法采用时,空两个变量都允许间断的基函数,更适用于移动网格,自适应算法以及并行计算,本文利用拉格朗日欧拉方法,采用F.Brezzi数值流通量,给出对流扩散方程的间断时空有限元离散格式,并证明格式的相容性,强制性,稳定性,解的存在唯一性,以及总体误差估计。
The discontinuous space-time finite element method for convection-diffusion equation is studied. This method is more suitable for moving mesh, adaptive and parallel computing, since the basic functions in it are discontinuous in both space and time. The F.Brezzi's flux and Lagrange-Euler method are used to construct the discontinuous space-time finite element scheme. The consistency, coercivity, stability, the existence and uniqueness, global estimate are proved.