Abstract
An adjusted sparse tensor product spectral Galerkin approximation method based on spherical harmonics is introduced and analyzed for solving pseudodifferential equations on the sphere with random input data. These equations arise from geodesy where the sphere is taken as a model of the earth. Numerical solutions to the corresponding \(k\)-th order statistical moment equations are found in adjusted sparse tensor approximation spaces which are accordingly designed to the regularity of the data and the equation. Established convergence theorem shows that the adjusted sparse tensor Galerkin discretization is superior not only to the full tensor product but also to the standard sparse tensor counterpart when the statistical moments of the data are of mixed unequal regularity. Numerical experiments illustrate our theoretical results.
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Acknowledgements
This research was funded by the Department of Science and Technology–Ho Chi Minh City (HCMC-DOST), and the Institute for Computational Science and Technology (ICST) at Ho Chi Minh city, Vietnam under Contract 21/2017/HD-KHCNTT on 21/09/2017. A part of this paper was done when the authors were visiting the Vietnam Institute for Advanced Study in Mathematics (VIASM). The authors thank VIASM for providing a fruitful research environment and working condition.
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Pham, D.T., Dũng, D. Adjusted Sparse Tensor Product Spectral Galerkin Method for Solving Pseudodifferential Equations on the Sphere with Random Input Data. Acta Appl Math 166, 187–214 (2020). https://doi.org/10.1007/s10440-019-00262-4
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DOI: https://doi.org/10.1007/s10440-019-00262-4