2018/01/03 by Yiran Xu, Xu, Yiran, Jingye Li +7
Computer Science · Engineering · Mathematics · #Advanced Numerical Methods in Computational Mathematics #Computational Engineering #FOS: Computer and information sciences #FOS: Mathematics #Finance #Fractional Differential Equations Solutions #Numerical Analysis (math.NA) #Numerical methods in engineering #and Science (cs.CE) #cs.CE #cs.NA #math.NA
paper · pdf · doi:10.48550/arxiv.1801.01206
arxiv created 2018/01/03 · openalex publication_date 2018/01/03 · arxiv updated 2018/01/08 · openalex created_date 2018/01/12 · openalex updated_date 2026/07/28
Decoupled fractional Laplacian wave equation can describe the seismic wave propagation in attenuating media. Fourier pseudospectral implementations, which solve the equation in spatial frequency domain, are the only existing methods for solving the equation. For the earth media with curved boundaries, the pseudospectral methods could be less attractive to handle the irregular computational domains. In the paper, we propose a radial basis function collocation method that can easily tackle the irregular domain problems. Unlike the pseudospectral methods, the proposed method solves the equation in physical variable domain. The directional fractional Laplacian is chosen from varied definitions of fractional Laplacian. Particularly, the vector Grünwald-Letnikov formula is employed to approximate fractional directional derivative of radial basis function. The convergence and stability of the method are numerically investigated by using the synthetic solution and the long-time simulations, respectively. The method's flexibility is studied by considering homogeneous and multi-layer media having regular and irregular geometric boundaries.