Conforming finite element methods for the stochastic Cahn-Hilliard-Cook equation

This paper is concerned with the finite element approximation of the stochastic Cahn-Hilliard-Cook equation driven by an infinite dimensional Wiener type noise. The Argyris finite elements are used to discretize the spatial variables while the infinite dimensional (cylindrical) Wiener process is approximated by truncated stochastic series spanned by the spectral basis of the covariance operator. The optimal strong convergence order in L2 and H˙−2 norms is obtained. Unlike the mixed finite element method studied in the existing literature, our method allows the covariance operator of the Wiener process to have an infinite trace, including the space-time white noise is allowed in our model. Numerical experiments are presented to illustrate the theoretical analysis.