Abstract
We consider symmetric as well as non-symmetric coupling formulations of FEM and BEM in the frame of nonlinear elasticity problems. In particular, the Johnson-Nédélec coupling is analyzed. We prove that these coupling formulations are well-posed and allow for unique Galerkin solutions if standard discretizations by piecewise polynomials are employed. Unlike prior works, our analysis does neither rely on an interior Dirichlet boundary to tackle the rigid body motions nor on any assumption on the mesh-size of the discretization used.
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Acknowledgments
The research of the authors is supported through the FWF research project Adaptive Boundary Element Method, see http://www.asc.tuwien.ac.at/abem/, funded by the Austrian Science Fund (FWF) under grant P21732, as well as through the Innovative Projects Initiative of Vienna University of Technology. This support is thankfully acknowledged. The authors thank Ernst P. Stephan (University of Hannover) and Heiko Gimperlein (Heriot-Watt University Edinburgh) for fruitful discussions and careful revisions of earlier versions of this manuscript. Moreover, we thank Francisco-Javier Sayas (University of Delaware) for some hint on the simplification of the proof of Theorem 2.
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Feischl, M., Führer, T., Karkulik, M. et al. Stability of symmetric and nonsymmetric FEM–BEM couplings for nonlinear elasticity problems. Numer. Math. 130, 199–223 (2015). https://doi.org/10.1007/s00211-014-0662-9
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DOI: https://doi.org/10.1007/s00211-014-0662-9