Some Domain Decomposition Algorithms for Elliptic Problems

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Some Domain Decomposition Algorithms for Elliptic Problems
Maksymilian Dryja
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Our finite element space is represented a* the sum of N+1 subspaces y' = Vo' + r, " + ... + V/^ .
The first subspace ^o" is equal to V^^, the same coarse global space of contin- uous, p. Ecewise Lnear functions on the coarse mesh defined by the substruc tures Q, that we introduced in Section 2. The other subspaces are related to 10 the subdomains, in the same way a* in a traditional Schwarz algorithm, i. E. Yh _ V'» p)^^(fi^). The computation of the projection of an arbitrary func- tion onto th
...e subspace V^ involves the solution of a standard finite element linear system of algebraic equations which is on the order of N. This coarse, global approximation of the elliptic equation is of the same type as the local problems associated with subdomadns. The only reaJ difference between the problem related to the first subspace and the others lies in the way that the right hatnd side of the Linear system is generated as weighted averages with weights determined by the basis functions associated with the coarse mesh.

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