HIGH ORDER FINITE DIFFERENCE/SPECTRAL METHODS TO A WATER WAVE MODEL WITH NONLOCAL VISCOSITY |
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Authors: | Mohammad Tanzil Hasan & Chuanju Xu |
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Institution: | School of Mathematical Sciences and Fujian Provincial Key Laboratory of Mathematical Modeling and High Performance Scientific Computing, Xiamen University, Xiamen 361005, China;School of Mathematical Sciences and Fujian Provincial Key Laboratory of Mathematical Modeling and High Performance Scientific Computing, Xiamen University, Xiamen 361005, China |
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Abstract: | In this paper, efficient numerical schemes are 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 is investigated. |
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Keywords: | Water waves Nonlocal viscosity Finite difference Spectral method Convergence order Decay rate |
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