A stabilized second order exponential time differencing multistep method for thin film growth model without slope selection

07/04/2019

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by   Wenbin Chen, et al.

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In this paper, a stabilized second order in time accurate linear exponential time differencing (ETD) scheme for the no-slope-selection thin film growth model is presented. An artificial stabilizing term Aτ^2∂Δ^2 u/∂ t is added to the physical model to achieve energy stability, with ETD-based multi-step approximations and Fourier collocation spectral method applied in the time integral and spatial discretization of the evolution equation, respectively. Long time energy stability and detailed ℓ^∞(0,T; ℓ^2) error analysis are provided based on the energy method, with a careful estimate of the aliasing error. In addition, numerical experiments are presented to demonstrate the energy decay and convergence rate.