@book{22fdbf53007040228d338829381956f3,

title = "HP-multigrid as smoother algorithm for higher order discontinuous Galerkin discretizations of advection dominated flows: Part II. Optimization of the Runge-Kutta smoother",

abstract = "Using a detailed multilevel analysis of the complete hp-Multigrid as Smoother algorithm accurate predictions are obtained of the spectral radius and operator norms of the multigrid error transformation operator. This multilevel analysis is used to optimize the coefficients in the semi-implicit Runge-Kutta smoother, such that the spectral radius of the multigrid error transformation operator is minimal under properly chosen constraints. The Runge-Kutta coefficients for a wide range of cell Reynolds numbers and a detailed analysis of the performance of the hp-MGS algorithm are presented. In addition, the computational complexity of the hp-MGS algorithm is investigated. The hp-MGS algorithm is tested on a fourth order accurate space-time discontinuous Galerkin finite element discretization of the advection-diffusion equation for a number of model problems, which include thin boundary layers and highly stretched meshes, and a non-constant advection velocity. For all test cases excellent multigrid convergence is obtained.",

keywords = "Higher order accurate discretizations, EWI-20658, Multigrid algorithms, Multi-level analysis, Runge-Kutta methods, Discontinuous Galerkin methods, METIS-279715, Space-time methods, MSC-76M10, IR-78252, MSC-65M60, MSC-65M55, Fourier analysis",

author = "{van der Vegt}, {Jacobus J.W.} and Sander Rhebergen",

year = "2011",

month = oct,

language = "English",

series = "Memorandum / Department of Applied Mathematics",

publisher = "University of Twente, Department of Applied Mathematics",

number = "1956",

}