Gegenbauer tau methods with and without spurious eigenvalues

Details Gegenbauer tau methods with and without spurious eigenvalues Gegenbauer tau methods with and without spurious eigenvalues

2007-08-14

arxiv.org/abs/0708.1900v3

Mathematics

Numerical Analysis

Revised version, includes a new figure. Clarified introduction and includes precise definitions. Resubmitted to SIAM J. Numer.

Scientific paper

It is proven that a class of Gegenbauer tau approximations to a 4th order differential eigenvalue problem of hydrodynamic type provide real, negative and distinct eigenvalues, as is the case for the exact solutions. This class of Gegenbauer tau methods includes Chebyshev and Legendre Galerkin and `inviscid' Galerkin but does not include Chebyshev and Legendre tau. Rigorous and numerical results show that the results are sharp: positive or complex eigenvalues arise outside of this class. The widely used modified tau approach is proved to be equivalent to the Galerkin method.

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