
Adaptive analysis 285
beginning of computation and 33 × 33 cosine virtual nodes. The initial
and nal distributions of the eld nodes are shown in Figure6.26. The
convergence plot of the function is given in Figure6.27a. It shows that
the convergence rate is indeed improved by the error recovery technique.
The reduction in the true error norm with an adaptive renement by the
ARDQ method appears in Figure6.27b. The comparison of the analyti-
cal and numerical values of the function is shown in Figure6.28, and the
contour plots of the numerical values of function are given in Figure6.29.
6.4.3 Semi-infinite plate with central hole
In th