Multiplicative Schwarz Algorithms for Some Nonsymmetric And Indefinite Problems
Multiplicative Schwarz Algorithms for Some Nonsymmetric And Indefinite Problems
Xiao Chuan Cai
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The additive variant of the two-level multiplicative Schwarz algorithm, considered here, is given in terms of the operator T = Pq + Ti-\ \-Tj. Algorithm 3 (The additive Schwarz algorithm). i) Compute g^ = Tu\; ii) Solve the operator equation (20) Tu, = g, by a conjugate gradient-type iterative method, e. G. The conjugate gradient method ifT is symmetric, positive definite and the GMRES method otherwise. 12 To prove the convergence of these algorithms for our class of nonsymmetric and indefinite... elliptic problems, we use a lemma that shows that the contribution from the skew-symmetric and zero order terms are of a lower order in H. Lemma 5. There exists a constant C, independent of H and h, such that, for all (i) \s{uh, PiUh)\ 0; (ii) \s{uh - P, Uk, P, Uh)\ 0. For i = 0, (ii) holds with H replaced by H" . The same estimates hold if we replace the bilinear form s[-, -) by c(-, -) and/or P, by TJ. The proof for the exact oblique projections follows directly from Section 4 of Cai and Widlund [10].
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