Abstract
In this paper, we use the non-conforming Crouzeix-Raviart element method to solve a Stekloff eigenvalue problem arising in inverse scattering. The weak formulation corresponding to this problem is non-self-adjoint and indefinite, and its Crouzeix-Raviart element discretization does not meet the condition of the Strang lemma. We use the standard duality technique to prove an extension of the Strang lemma. And we prove the convergence and error estimate of discrete eigenvalues and eigenfunctions using the spectral perturbation theory for compact operators. Finally, we present some numerical examples not only on uniform meshes but also on adaptive refined meshes to show that the Crouzeix-Raviart method is efficient for computing real and complex eigenvalues as expected.
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The authors cordially thank the editor and the referees for their valuable comments and suggestions that lead to the improvement of this paper.
Funding
This work is financially supported by the National Natural Science Foundation of China (Grant Nos. 11561014, 11761022).
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Communicated by: Aihui Zhou
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Yang, Y., Zhang, Y. & Bi, H. Non-conforming Crouzeix-Raviart element approximation for Stekloff eigenvalues in inverse scattering. Adv Comput Math 46, 81 (2020). https://doi.org/10.1007/s10444-020-09818-7
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DOI: https://doi.org/10.1007/s10444-020-09818-7