Uniform Preconditioners for High Order Finite Element Approximations of Planar Linear Elasticity

02/08/2023

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by   Mark Ainsworth, et al.

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A new preconditioner is developed for high order finite element approximation of linear elastic problems on triangular meshes in two dimensions. The new preconditioner results in a condition number that is bounded independently of the degree p, the mesh-size h and the ratio λ/μ. The resulting condition number is reduced to roughly 6.0 for all values of the parameters and discretization parameters on standard test problems. Crucially, the overall cost of the new preconditioner is comparable to the cost of applying standard domain decomposition based preconditioners.