   ISSN 1088-6842(online) ISSN 0025-5718(print)

On the coupling of boundary integral and finite element methods

Authors: Claes Johnson and J.-Claude Nédélec
Journal: Math. Comp. 35 (1980), 1063-1079
MSC: Primary 65N30
DOI: https://doi.org/10.1090/S0025-5718-1980-0583487-9
MathSciNet review: 583487
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Abstract: Let ${\Omega ^c}$ be the complementary of a bounded regular domain in ${{\mathbf {R}}^2}$ of boundary $\Gamma$. We consider the problem (1) $\left \{ {\begin {array}{*{20}{c}} {\Delta u = f;} & {{\text {in}}\;{\Omega ^c},} \\ {u{|_\Gamma } = {u_{0,}}} & {} \\ \end {array} } \right .$ where f has its support in a bounded subdomain ${\Omega _1}$ of ${\Omega ^c}$. Let ${\Gamma _2}$ be the common boundary of ${\Omega _1}$ and ${\Omega _2} = {\Omega ^c} - {\Omega _1}$. We solve the problem (1) by using an equivalent system of equations involving an integral equation on ${\Gamma ^2}$ coupled with the equation: (2) $\left \{ {\begin {array}{*{20}{c}} {\Delta u = f} \hfill & {{\text {in}}\;{\Omega _1},} \hfill \\ {u{|_\Gamma } = {u_0},} \hfill & {} \hfill \\ {u{|_{{\Gamma _2}}} = \lambda .} \hfill & {} \hfill \\ \end {array} } \right .$ We introduce a finite element approximation of Eq. (2) and of the integral equation and we prove optimal error estimates.

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