Effect of grid aspect ratio on convergence
The effects of high-aspect-ratio grids on algorithm convergence are considered by means of vector stability theory and computational experiments. The results indicate that approximately factored implicit schemes experience convergence deterioration because of nonoptimum local time-stepping procedure...
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| Veröffentlicht in: | AIAA journal 1994-12, Vol.32 (12), p.2401-2408 |
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| container_issue | 12 |
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| container_title | AIAA journal |
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| creator | Buelow, P. E. O Venkateswaran, S Merkle, Charles L |
| description | The effects of high-aspect-ratio grids on algorithm convergence are considered by means of vector stability theory and computational experiments. The results indicate that approximately factored implicit schemes experience convergence deterioration because of nonoptimum local time-stepping procedures and increased need for viscous preconditioning. Based on this insight, an enhanced algorithm is devised using improved selection of the local time step, appropriate definition of the viscous preconditioning matrix, and proper implementation of the boundary conditions. The new algorithm provides uniformly efficient convergence at all aspect ratios for both Euler and Navier-Stokes computations for a variety of test problems. |
| doi_str_mv | 10.2514/3.12306 |
| format | Article |
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| fulltext | fulltext |
| identifier | ISSN: 0001-1452 |
| ispartof | AIAA journal, 1994-12, Vol.32 (12), p.2401-2408 |
| issn | 0001-1452 1533-385X |
| language | eng |
| recordid | cdi_pascalfrancis_primary_3393067 |
| source | NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | Algorithms Computational methods in fluid dynamics Engineering Exact sciences and technology Fluid dynamics Fluid Mechanics And Heat Transfer Fundamental areas of phenomenology (including applications) Physics |
| title | Effect of grid aspect ratio on convergence |
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