Designing optimal smoothers for multigrid methods for unsteady flow problems

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Abstract

We consider the solution of unsteady flow problems using multigrid methods. There, the typical solver comes from a dual time stepping approach, where an existing method designed for a steady problem is used for unsteady flows. This design mismatch leads to a significant decrease in convergence speed. Here, we will use the linear advection equation as a model problem to find optimal Runge-Kutta smoothers specifically for the unsteady case, based on a Fourier analysis. This leads to a significantly improved multigrid method.

Detaljer

Författare
Enheter & grupper
Originalspråkengelska
Titel på värdpublikation20th AIAA Computational Fluid Dynamics Conference 2011
StatusPublished - 2011
PublikationskategoriForskning
Peer review utfördJa