Additive Schwarz Methods for Elliptic Finite Element Problems in Three Dimension

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Additive Schwarz Methods for Elliptic Finite Element Problems in Three Dimension
Maksymilian Dryja
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1. For all u G V'''(r), with To and T, j defined by (4. 9), we have jj (4. 10) 7o(l + \og—)-K^{u, u) < s{Tu, u) < j, s{u, u) Here 70 and 71 are constants independent of H and h and the jumps of the coefficients. To prove this theorem, we use Theorem 3. 1 of Section 3; cf. Dryja, Smith and Widlund [4]. For an alternative proof, see Smith [9], [10]. We now briefly discuss how the method can be implemented. Problem (2. 14) has been replaced by (4. 11) Tu = g where g = go + ES'ij. 9o = TqW/i, and gij = T. /u/i- To solve (4. 11) we can use the conjugate gradient method since T is symmetric, positive definite and well conditioned. For simplicity we only consider the first Richardson method. Thus ^ ^, "+1 = i, n _ ^rp^^n _ y) ^ ^ ^ 2/(70(1 + log -r)-' + 7l) n Let r" = r(u" - tz) = rS + Eij rf^, where r^ = ro(u" - u) and rf^ = r. J(u" - u). To find Tq and r^j, we solve (4. 12a) boir^, v) = ^(u", u) -{g, v) = F{v), v e Vo and (4. 126) b, j{r^^, v) = Fiv), vGV„ To compute s{u"-, v) we solve the Dirichlet problems (4.

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