By Arieh Iserles
Acta Numerica is an annual e-book containing invited survey papers via top researchers in numerical arithmetic and medical computing. The papers current overviews of contemporary advancements of their region and supply 'state of the paintings' suggestions and research.
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Additional info for Acta Numerica 2010 (Volume 19)
3), we obtain Πh v L2 (Ω) ≥ v L2 (Ω) (1 − C(k)h2 ), which gives the final estimate, (k) λh ≤ λ(k) 1 1 − C(k)h2 2 2 ≃ λ(k) 1 + C(k)h2 ≃ λ(k) (1 + 2C(k)h2 ). In the case of a general domain Ω, it is possible to obtain the following more general result (Raviart and Thomas 1983): (k) λh ≤ λ(k) 1 + C(k) sup v − Πh v (k) v∈V v =1 2 H 1 (Ω) . 5) We conclude this section with an estimate for the eigenfunctions. 2) that the study of the case of multiple eigenvalues is not so simple. For this reason, we start with the situation when λ(i) = λ(k) for all i = k (that is, λ(k) is a simple eigenvalue).
The space U is approximated by div(Σh ). In the case of lowest-order elements, in particular, the space Uh is P0 . We refer to Brezzi and Fortin (1991) for more details. We performed the computation on a square domain Ω = ]0, π[2 using a sequence of uniform meshes of squares (the parameter N refers to the number of subdivisions of each side). 4. The number of degrees of freedom is evaluated in terms of the variable uh , since this is the dimension of the algebraic eigenvalue problem to be solved (in this case equal to the number of elements, since uh is approximated by piecewise constants).
1) is equal to the number of internal vertices of the mesh. This is due to the fact that the elements of Σh with vanishing rot coincide with gradients of piecewise linear functions in H01 (Ω). 5) with nodal finite elements, that is, standard finite elements in each component with degrees of freedom associated to nodal values. It was soon realized that simulations performed with standard piecewise linears are very sensitive to the used mesh. 1 with continuous piecewise linear elements in each component.
Acta Numerica 2010 (Volume 19) by Arieh Iserles