HIGH ORDER FINITE DIFFERENCE/SPECTRAL METHODS TO A WATER WAVE MODEL WITH NONLOCAL VISCOSITY

• 来源期刊: 计算数学（英文版）
• 关键词: Water waves Nonlocal viscosity Finite difference Spectral method Convergence order Decay rate
• 年，卷（期）: 2020,（4）
• 页码范围: 580-605
• 页数: 26页
• 语种: 英文
• DOI: 10.4208/jcm.1902-m2017-0280

摘要

In this paper,efficient numerical scheme is proposed for solving the water wave model with nonlocal viscous term that describe the propagation of surface water wave.By using the Caputo fractional derivative definition to approximate the nonlocal fractional operator,finite difference method in time and spectral method in space are constructed for the considered model.The proposed method employs known 5/2 order scheme for fractional derivative and a mixed linearization for the nonlinear term.The analysis shows that the proposed numerical scheme is unconditionally stable and error estimates are provided to predict that the second order backward differentiation plus 5/2 order scheme converges with order 2 in time,and spectral accuracy in space.Several numerical results are provided to verify the efficiency and accuracy of our theoretical claims.Finally,the decay rate of solutions are investigated.