Local preconditioning in a stagnation point

Bram van Leer, Lisa Mesaros, Chang Hsien Tai, Eli Turkel

Research output: Contribution to conferencePaperpeer-review


Local preconditioning yields desirable effects such as convergence acceleration and preservation of accuracy in the incompressible limit, but these come at the expense of robustness. Current research focuses on making the various preconditioned Euler discretizations that have been developed more reliable near flow singularities such as sonic and stagnation points. In this report we discuss the loss of stability in computing stagnating flow with the symmetric Van Leer-Lee-Roe preconditioning, and do an exhaustive search for modifications of the matrix (for low Mach numbers) by which the instability can be avoided. Some numerical support regarding the effectiveness of these modifications is presented.

Original languageEnglish
Number of pages14
StatePublished - 1995
Event12th Computational Fluid Dynamics Conference, 1995 - San Diego, United States
Duration: 19 Jun 199522 Jun 1995


Conference12th Computational Fluid Dynamics Conference, 1995
Country/TerritoryUnited States
CitySan Diego


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