| タイトル | Conjugate gradient coupled with multigrid for an indefinite problem |
| 本文（外部サイト） | http://hdl.handle.net/2060/19840021489 |
| 著者（英） | Nachshon, A.; Gozani, J.; Turkel, E. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1984-06-01 |
| 言語 | eng |
| 内容記述 | An iterative algorithm for the Helmholtz equation is presented. This scheme was based on the preconditioned conjugate gradient method for the normal equations. The preconditioning is one cycle of a multigrid method for the discrete Laplacian. The smoothing algorithm is red-black Gauss-Seidel and is constructed so it is a symmetric operator. The total number of iterations needed by the algorithm is independent of h. By varying the number of grids, the number of iterations depends only weakly on k when k(3)h(2) is constant. Comparisons with a SSOR preconditioner are presented. |
| NASA分類 | NUMERICAL ANALYSIS |
| レポートNO | 84N29558
ICASE-84-18
NASA-CR-172379
NAS 1.26:172379 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/158828 |
