TY - EJOU
AU - Zhang, Yanlong
AU - Zhou, Yanhui
AU - Wu, Jiming
TI - Quadratic Finite Volume Element Schemes over Triangular Meshes for a Nonlinear Time-Fractional Rayleigh-Stokes Problem
T2 - Computer Modeling in Engineering \& Sciences
PY - 2021
VL - 127
IS - 2
SN - 1526-1506
AB - In this article, we study a 2D nonlinear time-fractional Rayleigh-Stokes problem, which has an anomalous sub-diffusion term, on triangular meshes by quadratic finite volume element schemes. Time-fractional derivative, defined by Caputo fractional derivative, is discretized through formula, and a two step scheme is used to approximate the time first-order derivative at time , where the nonlinear term is approximated by using a matching linearized difference scheme. A family of quadratic finite volume element schemes with two parameters are proposed for the spatial discretization, where the range of values for two parameters are , . For testing the precision of numerical algorithms, we calculate some numerical examples which have known exact solution or unknown exact solution by several kinds of quadratic finite volume element schemes, and contrast with the results of an existing quadratic finite element scheme by drawing diversified comparison plots and showing the detailed data of *L*^{2} error results and convergence orders. Numerical results indicate that, *L*^{2} error estimate of one scheme with parameters , is , and *L*^{2} error estimates of other schemes are , where *h* and denote the spatial and temporal discretization parameters, respectively.
KW - Quadratic finite volume element schemes; anomalous sub-diffusion term; *L*^{2} error estimate; quadratic finite element scheme
DO - 10.32604/cmes.2021.014950