TY - JOUR T1 - A Least-Squares/Fictitious Domain Method for Linear Elliptic Problems with Robin Boundary Conditions JO - Communications in Computational Physics VL - 3 SP - 587 EP - 606 PY - 2011 DA - 2011/03 SN - 9 DO - http://doi.org/10.4208/cicp.071009.160310s UR - https://global-sci.org/intro/article_detail/cicp/7512.html KW - AB -

In this article, we discuss a least-squares/fictitious domain method for the solution of linear elliptic boundary value problems with Robin boundary conditions. Let Ω and ω be two bounded domains of Rsuch that ω⊂Ω. For a linear elliptic problem in Ω\ω with Robin boundary condition on the boundary γ of ω, our goal here is to develop a fictitious domain method where one solves a variant of the original problem on the full Ω, followed by a well-chosen correction over ω. This method is of the virtual control type and relies on a least-squares formulation making the problem solvable by a conjugate gradient algorithm operating in a well chosen control space. Numerical results obtained when applying our method to the solution of two-dimensional elliptic and parabolic problems are given; they suggest optimal order of convergence.