Abstract
In this paper, we propose and analyze spectral-Galerkin methods for the biharmonic eigenvalue problem in circular/spherical/elliptical domains. We first analyze the eigenfunction formulated fourth-order equation under the polar coordinates, then we derive the pole condition and reduce the problem on a circular disk/sphere to a sequence of equivalent one-dimensional eigenvalue problems that can be solved in parallel. The novelty of our approach lies in the construction of suitably weighted Sobolev spaces according to the pole conditions, based on which, the optimal error estimate for approximated eigenvalue of each one-dimensional problem can be obtained. Further, we extend our method to the non-separable biharmonic eigenvalue problem in an elliptic domain and establish the optimal error bounds. Finally, we provide some numerical experiments to validate our theoretical results and algorithms.
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Funding
This work is supported in part by the National Natural Science Foundation of China Grants Nos. 11661022, 11871092, and 11871455, and the Fund for Guizhou provincial colleges and universities top notch talents support program (Qianjiaohe No. KY[2018]041), the Technology Fund of Guizhou Province No. [2017]1124, and the Science and Technology Planning Project of Guizhou Province (Qiankehe Platform Talents No. [2017]5726-39).
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Appendices
Appendix A: Jacobi and generalized Jacobi polynomials
The classical Jacobi polynomials \(J_{k}^{\alpha ,\beta }(\zeta )\), k ≥ 0 with α,β > − 1 are mutually orthogonal with respect to the Jacobi weight function χα,β := χα,β(ζ) = (1 − ζ)α(1 + ζ)β on Λ = (− 1, 1):
where δm,n is the Kronecker delta, and
For \(k\in \mathbb {Z}\), denote by \((a)_{k}=\frac {{\Gamma }(a+k)}{{\Gamma }(a)}\) the Pochhammer symbol. The classical Jacobi polynomials possess the following important representation:
which symbolically furnishes the extension of \(J^{\alpha ,\beta }_{n}(\zeta )\) to arbitrary α and β. Generalized Jacobi polynomials preserve most of the essential properties of the classic Jacobi polynomials, among which the following identities [26] are of importance in the current paper as follows:
In particular, the generalized Jacobi polynomials with α and/or β being integers are our greatest interest [15] as follows:
The generalized Jacobi polynomials with negative indices not only simplify the numerical analysis for the spectral approximations of differential equations but also lead to very efficient numerical algorithms [11, 23].
Finally, it is worthy to point out that a reduction of the degree of \(J^{\alpha ,\beta }_{n}(\zeta )\) occurs if and only if − n − α − β ∈{1, 2,…,n},
where n0 := −n − α − β if − n − α − β ∈{1, 2,…,n} and n0 := 0 otherwise.
Appendix B: Proof of Lemma 3.2
At first, (3.13)–(3.15) are trivial results on the Jacobi expansion.
By (A.4), (A.5), and (A.8), one finds that, for i ≥ 4,
Then by (A.5), (A.4) and (A.5), one derives as follows:
and
which give (3.8) and (3.9) immediately.
which states (3.11).
Further, by (A.5), (A.4), and (A.5),
and by (A.8), (A.4), and (A.5),
which lead to (3.10) and (3.12), respectively.
Finally, (3.16) and (3.17) are direct consequences of (3.8)–(3.15) and (A.1).
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An, J., Li, H. & Zhang, Z. Spectral-Galerkin approximation and optimal error estimate for biharmonic eigenvalue problems in circular/spherical/elliptical domains. Numer Algor 84, 427–455 (2020). https://doi.org/10.1007/s11075-019-00760-4
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DOI: https://doi.org/10.1007/s11075-019-00760-4