Abstract
Abstract This article is devoted to designing efficient linear finite element algorithm for the fractional Cahn–Hilliard equation, an important and newly proposed phase field model. Combining the advantages of the classic BiCG algorithm and the Toeplitz-like structure of the coefficient matrix, we develop a fast BiCG(FBiCG) algorithm for the linearized scheme to compute numerically the fractional Cahn–Hilliard equation. Our theoretical analysis and numerical experiments demonstrate that the proposed FBiCG reduces the computation cost and the storage to O ( M log M ) and O ( M ) , possesses the same convergence rates as Newton’s algorithm does in space and time, and preserves the energy dissipation and equality laws. The numerical experiments also demonstrate that the FBiCG is almost mass conserved, recognizes accurately the phase separation by a very clear coarse graining process and the influences of different indices r and s of fractional Laplacian and different coefficients K and a on the width of the interfaces.
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