| タイトル | Multigrid solutions to quasi-elliptic schemes |
| 本文（外部サイト） | http://hdl.handle.net/2060/19860004486 |
| 著者（英） | Taasan, S.; Brandt, A. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1985-05-01 |
| 言語 | eng |
| 内容記述 | Quasi-elliptic schemes arise from central differencing or finite element discretization of elliptic systems with odd order derivatives on non-staggered grids. They are somewhat unstable and less accurate then corresponding staggered-grid schemes. When usual multigrid solvers are applied to them, the asymptotic algebraic convergence is necessarily slow. Nevertheless, it is shown by mode analyses and numerical experiments that the usual FMG algorithm is very efficient in solving quasi-elliptic equations to the level of truncation errors. Also, a new type of multigrid algorithm is presented, mode analyzed and tested, for which even the asymptotic algebraic convergence is fast. The essence of that algorithm is applicable to other kinds of problems, including highly indefinite ones. |
| NASA分類 | NUMERICAL ANALYSIS |
| レポートNO | 86N13955
ICASE-85-26
NASA-CR-177973
NAS 1.26:177973 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/155167 |
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