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1 results

  • Fast Solver for the Local Discontinuous Galerkin Discretization of the KdV Type Equations

  • Ruihan Guo, Yan Xu
  • Journal:
    Communications in Computational Physics / Volume 17 / Issue 2 / February 2015
    Published online by Cambridge University Press:
    22 January 2015, pp. 424-457
    Print publication:
    February 2015

  • In this paper, we will develop a fast iterative solver for the system of linear equations arising from the local discontinuous Galerkin (LDG) spatial discretization and additive Runge-Kutta (ARK) time marching method for the KdV type equations. Being implicit in time, the severe time step , with the k-th order of the partial differential equations (PDEs)) restriction for explicit methods will be removed. The equations at the implicit time level are linear and we demonstrate an efficient, practical multigrid (MG) method for solving the equations. In particular, we numerically show the optimal or sub-optimal complexity of the MG solver and a two-level local mode analysis is used to analyze the convergence behavior of the MG method. Numerical results for one-dimensional, two-dimensional and three-dimensional cases are given to illustrate the efficiency and capability of the LDG method coupled with the multigrid method for solving the KdV type equations.