Table 2 Measured iteration numbers \(n_{CG}\) for the preconditioned CG method attained for the model problem (19) on the configuration depicted in Fig. 1 using a fixed volume 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 | 1475 | 30 | 20 | 30 |
4 | 5710 | 37 | 25 | 32 |
5 | 21,965 | 53 | 36 | 39 |
6 | 88,022 | 56 | 60 | 54 |
7 | 350,511 | 133 | 96 | 75 |
8 | 1,392,765 | 233 | 168 | 116 |