| タイトル | Effects of Mesh Irregularities on Accuracy of Finite-Volume Discretization Schemes |
| 本文（外部サイト） | http://hdl.handle.net/2060/20120001451 |
| 著者（英） | Thomas, James L.; Diskin, Boris |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2012-01-09 |
| 言語 | eng |
| 内容記述 | The effects of mesh irregularities on accuracy of unstructured node-centered finite-volume discretizations are considered. The focus is on an edge-based approach that uses unweighted least-squares gradient reconstruction with a quadratic fit. For inviscid fluxes, the discretization is nominally third order accurate on general triangular meshes. For viscous fluxes, the scheme is an average-least-squares formulation that is nominally second order accurate and contrasted with a common Green-Gauss discretization scheme. Gradient errors, truncation errors, and discretization errors are separately studied according to a previously introduced comprehensive methodology. The methodology considers three classes of grids: isotropic grids in a rectangular geometry, anisotropic grids typical of adapted grids, and anisotropic grids over a curved surface typical of advancing layer grids. The meshes within the classes range from regular to extremely irregular including meshes with random perturbation of nodes. Recommendations are made concerning the discretization schemes that are expected to be least sensitive to mesh irregularities in applications to turbulent flows in complex geometries. |
| NASA分類 | Numerical Analysis |
| レポートNO | NF1676L-13910
AIAA Paper 2012-0609 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
