Research Article
Application of Hierarchical Two-Level Spectral Preconditioning Method for Electromagnetic Scattering from the Rough Surface
Table 2
Construction time and solution time (in seconds) for the paraboloid antenna.
| Basis functions | Mesh sizes | Unknowns | Solution method | Construction time | Iteration step | Solution time | Total time |
| 2-order | 0.3 | 19,992 | GMRES | — | 470 | 1,334 | 1334 | FGMRES | — | 52 | 179 | 179 | Two-level | 134 | 17 | 45 | 179 |
| 3-order | 0.5 | 17,652 | GMRES | — | 1593 | 2,106 | 2106 | FGMRES | — | 111 | 355 | 355 | Two-level | 101 | 26 | 49 | 150 |
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