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Stable and efficient finite-difference nonlinear-multigrid schemes for the phase field crystal equation

Published: 01 August 2009 Publication History

Abstract

In this paper we present and compare two unconditionally energy stable finite-difference schemes for the phase field crystal equation. The first is a one-step scheme based on a convex splitting of a discrete energy by Wise et al. [S.M. Wise, C. Wang, J.S. Lowengrub, An energy stable and convergent finite-difference scheme for the phase field crystal equation, SIAM J. Numer. Anal., in press]. In this scheme, which is first order in time and second order in space, the discrete energy is non-increasing for any time step. The second scheme we consider is a new, fully second-order two-step algorithm. In the new scheme, the discrete energy is bounded by its initial value for any time step. In both methods, the equations at the implicit time level are nonlinear but represent the gradients of strictly convex functions and are thus uniquely solvable, regardless of time step-size. We solve the nonlinear equations using an efficient nonlinear multigrid method. Numerical simulations are presented and confirm the stability, efficiency and accuracy of the schemes.

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    Published In

    cover image Journal of Computational Physics
    Journal of Computational Physics  Volume 228, Issue 15
    August, 2009
    306 pages

    Publisher

    Academic Press Professional, Inc.

    United States

    Publication History

    Published: 01 August 2009

    Author Tags

    1. Energy stability
    2. Finite difference
    3. Multigrid
    4. Phase field crystal

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