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An improved pseudospectral meshless radial point interpolation (PSMRPI) method for 3D wave equation with variable coefficients

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Abstract

In this paper, a pseudospectral meshless radial point interpolation (PSMRPI) technique is applied to the three-dimensional wave equation with variable coefficients subject to given appropriate initial and Dirichlet boundary conditions. The present method is a kind of combination of meshless methods and spectral collocation techniques. The point interpolation method along with the radial basis functions is used to construct the shape functions as the basis functions in the frame of the spectral collocation methods. These basis functions will have Kronecker delta function property, as well as unitary possession. In the proposed method, operational matrices of higher order derivatives are constructed and then applied. The merit of this innovative method is that, it does not require any kind of integration locally or globally over sub-domains, as it is essential in meshless methods based on Galerkin weak forms, such as element-free Galerkin and meshless local Petrov–Galerkin methods. Therefore, computational cost of PSMRPI method is low. Further, it is proved that the procedure is stable with respect to the time variable over some conditions on the 3D wave model, and the convergence of the technique is revealed. These latest claims are also shown in the numerical examples, which demonstrate that PSMRPI provides excellent rate of convergence.

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Authors and Affiliations

  1. Department of Applied Mathematics, Imam Khomeini International University, Qazvin, 34149-16818, Iran

    Elyas Shivanian

  2. Department of Scientific Computing, Florida State University, Tallahassee, FL, 32306-4120, USA

    Malihe Shaban

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  1. Elyas Shivanian
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  2. Malihe Shaban
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Correspondence to Elyas Shivanian.

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Shivanian, E., Shaban, M. An improved pseudospectral meshless radial point interpolation (PSMRPI) method for 3D wave equation with variable coefficients. Engineering with Computers 35, 1159–1171 (2019). https://doi.org/10.1007/s00366-018-0656-9

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