A Runge-Kutta method with using eighth-order nearly-analytic spatial discretization operator for solving a 2D acoustic wave equation

Zhang, C., Li, X., Ma, X. and Song, G., 2014. A Runge-Kutta method with using eighth-order nearly-analytic spatial discretization operator for solving a 2D acoustic wave equation. Journal of Seismic Exploration, 23: 279-302. In this paper, we develop an eighth-order NAD-RK method for solving a 2D acoustic wave equation. The new method uses an eighth-order nearly-analytic discretization (NAD) operator to approximate the high-order spatial derivatives in the wave equation. The wavefield displacements and their gradients are used simultaneously. And we apply a third-order Runge-Kutta (RK) method to solve the semi-discrete ordinary differential equations (ODEs) with respect to time. Thus this method has third-order accuracy in time and can achieve eighth-order accuracy in space. Theoretical properties including stability and errors are analyzed for the eighth-order NAD-RK method in detail. Meanwhile, the numerical dispersion relationship for this method is investigated and the numerical dispersion is tested in our study. The study shows that the eighth-order NAD-RK method has the smallest numerical dispersion and the weakest numerical dispersion anisotropy compared with the eighth-order Lax-Wendroff correction (LWC) method and the eighth-order staggered-grid (SG) method. The computational efficiency of the eighth-order NAD-RK method is also tested. The results show that the eighth-order NAD-RK method needs less computational time and requires less memory than the eighth-order LWC and SG methods. Finally, the eighth-order NAD-RK method is used to simulate acoustic wavefields for two heterogeneous layered models. The simulation results further demonstrate that the eighth-order NAD-RK method can provide high-order accuracy for the complex heterogeneous models and is effective to suppress the numerical dispersion caused by discretizing the acoustic wave equation when too coarse grids are used or strong discontinuities exist in the medium. Thus, the eighth-order NAD-RK method can be potentially used in seismic tomography and large-scale wave propagation problems.
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