Error estimates in the fast multipole method for scattering problems. Part 2 : truncation of the Gegenbauer series
ESAIM: Modélisation mathématique et analyse numérique, Tome 39 (2005) no. 1, pp. 183-221.

We perform a complete study of the truncation error of the Gegenbauer series. This series yields an expansion of the Green kernel of the Helmholtz equation, e i|u -v | 4πi|u -v |, which is the core of the Fast Multipole Method for the integral equations. We consider the truncated series where the summation is performed over the indices L. We prove that if v=|v | is large enough, the truncated series gives rise to an error lower than ϵ as soon as L satisfies L+1 2v+CW 2 3 (K(α)ϵ -δ v γ )v 1 3 where W is the Lambert function, K(α) depends only on α=|u | |v | and C,δ,γ are pure positive constants. Numerical experiments show that this asymptotic is optimal. Those results are useful to provide sharp estimates of the error in the fast multipole method for scattering computation.

DOI : 10.1051/m2an:2005008
Classification : 33C10, 33C55, 41A80
Mots clés : Gegenbauer, fast multipole method, truncation error
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     title = {Error estimates in the fast multipole method for scattering problems. {Part} 2 : truncation of the {Gegenbauer} series},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {183--221},
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Carayol, Quentin; Collino, Francis. Error estimates in the fast multipole method for scattering problems. Part 2 : truncation of the Gegenbauer series. ESAIM: Modélisation mathématique et analyse numérique, Tome 39 (2005) no. 1, pp. 183-221. doi : 10.1051/m2an:2005008. http://www.numdam.org/articles/10.1051/m2an:2005008/

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