Comparative study on higher order compact RBF-FD formulas with Gaussian and Multiquadric radial functions
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912154692616192 |
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| author | Yadav, Manoj Kumar Satyanarayana, Chirala Sreedhar, A. |
| author_facet | Yadav, Manoj Kumar Satyanarayana, Chirala Sreedhar, A. |
| contents | We generate Gaussian radial function based higher order compact RBF-FD formulas for some differential operators. Analytical expressions for weights associated to first and second derivative formulas (up to order 10) and 2D-Laplacian formulas (up to order 6) are derived. Then these weights are used to obtain analytical expression for local truncation errors. The weights are obtained by symbolic computation of a linear system in Mathematica. Often such linear systems are not directly amenable to symbolic computation. We make use of symmetry of formula stencil along with Taylor series expansions for performing the computation. In the flat limit, the formulas converge to their respective order polynomial based compact FD formulas. We validate the formulas with standard test functions and demonstrate improvement in approximation accuracy with respect to corresponding order multiquadric based compact RBF-FD formulas and compact FD schemes. We also compute optimal value of shape parameter for each formula. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_10036 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Comparative study on higher order compact RBF-FD formulas with Gaussian and Multiquadric radial functions Yadav, Manoj Kumar Satyanarayana, Chirala Sreedhar, A. Numerical Analysis 41A58, 41A30, 41A63, 65D12, 65D25 We generate Gaussian radial function based higher order compact RBF-FD formulas for some differential operators. Analytical expressions for weights associated to first and second derivative formulas (up to order 10) and 2D-Laplacian formulas (up to order 6) are derived. Then these weights are used to obtain analytical expression for local truncation errors. The weights are obtained by symbolic computation of a linear system in Mathematica. Often such linear systems are not directly amenable to symbolic computation. We make use of symmetry of formula stencil along with Taylor series expansions for performing the computation. In the flat limit, the formulas converge to their respective order polynomial based compact FD formulas. We validate the formulas with standard test functions and demonstrate improvement in approximation accuracy with respect to corresponding order multiquadric based compact RBF-FD formulas and compact FD schemes. We also compute optimal value of shape parameter for each formula. |
| title | Comparative study on higher order compact RBF-FD formulas with Gaussian and Multiquadric radial functions |
| topic | Numerical Analysis 41A58, 41A30, 41A63, 65D12, 65D25 |
| url | https://arxiv.org/abs/2412.10036 |