Abstract
It is well-known that non-periodic boundary conditions reduce considerably the overall accuracy of an approximating scheme. In previous papers the present authors have studied a fourth-order compact scheme for the one-dimensional biharmonic equation. It relies on Hermitian interpolation, using functional values and Hermitian derivatives on a three-point stencil. However, the fourth-order accuracy is reduced to a mere first-order near the boundary. In turn this leads to an “almost third-order” accuracy of the approximate solution. By a careful inspection of the matrix elements of the discrete operator, it is shown that the boundary does not affect the approximation, and a full (“optimal”) fourth-order convergence is attained. A number of numerical examples corroborate this effect.
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Acknowledgements
We would like to thank Professor B. Bialecki of the Colorado School of Mines, who challenged us with providing a proof for the fourth-order accuracy of the three point biharmonic operator.
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This paper is dedicated to Professor Saul Abarbanel on the occasion of his 80-th birthday.
The authors were partially supported by a French-Israeli scientific cooperation grant 3-1355. The first author was also supported by a research grant of Afeka - Tel-Aviv Academic College of Engineering.
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Fishelov, D., Ben-Artzi, M. & Croisille, JP. Recent Advances in the Study of a Fourth-Order Compact Scheme for the One-Dimensional Biharmonic Equation. J Sci Comput 53, 55–79 (2012). https://doi.org/10.1007/s10915-012-9611-x
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DOI: https://doi.org/10.1007/s10915-012-9611-x