将最小二乘法和稳定化的流线扩散法相结合,研究了对流扩散方程的非协调有限元格式,用矩形EQ1^rot元和零阶R-T元分别来逼近位移和应力,利用单元本身的特殊性质,证明了离散格式解的存在惟一性,得到了位移H^1-模和应力H(div)-模的最优误差估计.
In this paper, combining with the least square method and stabilization streamline diffusion method, the nonconforming mixed finite element scheme is analyzed for convection- diffusion problems. The rectangular EQ1^rot element and zero order R-T element are used to approximate the displacement and the stress, respectively. By use of the special properties of the elements, the existence and uniqueness of the approximate solutions are proved. The optimal order error estimates for the displacement in broken H^1-norm and the stress in H (div)- norm are derived.