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Directional agglomeration multigrid techniques for high-reynolds number viscous flows
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mavriplis, Dimitri J. |
| Copyright Year | 1998 |
| Description | A preconditioned directional-implicit agglomeration algorithm is developed for solving two- and three-dimensional viscous flows on highly anisotropic unstructured meshes of mixed-element types. The multigrid smoother consists of a pre-conditioned point- or line-implicit solver which operates on lines constructed in the unstructured mesh using a weighted graph algorithm. Directional coarsening or agglomeration is achieved using a similar weighted graph algorithm. A tight coupling of the line construction and directional agglomeration algorithms enables the use of aggressive coarsening ratios in the multigrid algorithm, which in turn reduces the cost of a multigrid cycle. Convergence rates which are independent of the degree of grid stretching are demonstrated in both two and three dimensions. Further improvement of the three-dimensional convergence rates through a GMRES technique is also demonstrated. |
| File Size | 1426755 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19980041394 |
| Archival Resource Key | ark:/13960/t3wt3mh84 |
| Language | English |
| Publisher Date | 1998-01-01 |
| Access Restriction | Open |
| Subject Keyword | Numerical Analysis High Reynolds Number Multigrid Methods Computational Fluid Dynamics Unstructured Grids Mathematics Agglomeration Two Dimensional Flow Discretization Mathematics Convergence Navier-stokes Equation Algorithms Three Dimensional Flow Anisotropy Flow Velocity Preconditioning Viscous Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
