Table 3 Measured iteration numbers \(n_{CG}\) for the preconditioned CG method attained for the model problem (19) on the configuration depicted in Fig. 4 using a single element overlap
From: Multilevel preconditioners for embedded enriched partition of unity approximations
\(\varvec{k}\) | \({{\mathbf {{\small {\uppercase {Dof}}}}}}\) | \(\varvec{n_\mathrm {CGV(1,1)}}\) | \(\varvec{n_\mathrm {CGV(3,3)}}\) | \(\varvec{n_\mathrm {CGW(1,1)}}\) |
|---|---|---|---|---|
3 | 3,843 | 18 | 10 | 18 |
4 | 14,063 | 18 | 10 | 18 |
5 | 54,408 | 19 | 11 | 18 |
6 | 214,527 | 20 | 11 | 19 |
7 | 847,974 | 20 | 12 | 19 |
8 | 3,372,646 | 21 | 14 | 19 |
9 | 13,380,007 | 22 | 16 | 13 |