Geodesic
A numerical study on Neumann-Neumann methods for hp approximations on geometrically refined boundary layer meshes II. Three-dimensional problems
ESAIM: Mathematical Modelling and Numerical Analysis , Tome 40 (2006) no. 1, pp. 99-122

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In this paper, we present extensive numerical tests showing the performance and robustness of a Balancing Neumann-Neumann method for the solution of algebraic linear systems arising from hp finite element approximations of scalar elliptic problems on geometrically refined boundary layer meshes in three dimensions. The numerical results are in good agreement with the theoretical bound for the condition number of the preconditioned operator derived in [Toselli and Vasseur, IMA J. Numer. Anal. 24 (2004) 123-156]. They confirm that the condition numbers are independent of the aspect ratio of the mesh and of potentially large jumps of the coefficients. Good results are also obtained for certain singularly perturbed problems. The condition numbers only grow polylogarithmically with the polynomial degree, as in the case of p approximations on shape-regular meshes [Pavarino, RAIRO: Modél. Math. Anal. Numér. 31 (1997) 471-493]. This paper follows [Toselli and Vasseur, Comput. Methods Appl. Mech. Engrg. 192 (2003) 4551-4579] on two dimensional problems.

DOI : 10.1051/m2an:2006004
Classification : 65N22, 65N35, 65N55
Keywords: domain decomposition, preconditioning, $hp$ finite elements, spectral elements, anisotropic meshes 
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     title = {A numerical study on {Neumann-Neumann} methods for $hp$ approximations on geometrically refined boundary layer meshes {II.} {Three-dimensional} problems},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
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Toselli, Andrea; Vasseur, Xavier. A numerical study on Neumann-Neumann methods for $hp$ approximations on geometrically refined boundary layer meshes II. Three-dimensional problems. ESAIM: Mathematical Modelling and Numerical Analysis , Tome 40 (2006) no. 1, pp. 99-122. doi: 10.1051/m2an:2006004

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