]>

Table 3: Relative error of numerical solution on four basic meshes ($\nu =0.5$).

Meshes size ${\parallel u-u_h\parallel }_{L^2}/{\parallel u\parallel }_{L^2}$ ${\parallel \nabla (u-u_h)\parallel }_{L^2}/{\parallel \nabla u\parallel }_{L^2}$ ${\parallel p-p_h\parallel }_{L^2}/{\parallel p\parallel }_{L^2}$ ${\parallel \lambda -{\lambda }_h\parallel }_{L^2}/{\parallel \lambda \parallel }_{L^2}$ $3\times 6$ $h$ 0.0535782 0.0662608 0.1495650 0.3102600 $4\times 8$ $3/4h$ 0.0358974 0.0580217 0.1277890 0.2304795 $5\times 10$ $3/5h$ 0.0262548 0.0516052 0.1121745 0.1904752 $6\times 12$ $1/2h$ 0.0241313 0.0457448 0.0876485 0.1675414