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A Runge–Kutta–Chebyshev SPH algorithm for elastodynamics

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Abstract

A stable and accurate Smoothed Particle Hydrodynamics (SPH) method is proposed for solving elastodynamics in solid mechanics. The SPH method is mesh-free, and it promises to overcome most of disadvantages of the traditional finite element techniques. The absence of a mesh makes the SPH method very attractive for those problems involving large deformations, moving boundaries and crack propagation. However, the conventional SPH method still has significant limitations that prevent its acceptance among researchers and engineers, namely the stability and computational costs. In approximating unsteady problems using the SPH method, attention should be given to the choice of time integration schemes as accuracy and efficiency of the SPH solution may be limited by the timesteps used in the simulation. This study presents an attempt to reconstruct an unconditionally stable SPH method for elastodynamics. To achieve this objective we implement an explicit Runge–Kutta Chebyshev scheme with extended stages in the SPH method. This time stepping scheme adds in a natural way a stabilizing stage to the conventional Runge–Kutta method using the Chebyshev polynomials. Numerical results are shown for several test problems in elastodynamics. For the considered elastic regimes, the obtained results demonstrate the ability of our new algorithm to better maintain the shape of the solution in the presence of shocks.

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Nanchang University, Nanchang, Jiangxi Province, 330031, China

    Lisha He & Mohammed Seaid

  2. School of Engineering and Computing Sciences, University of Durham, South Road, Durham, DH1 3LE, UK

    Lisha He

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  1. Lisha He
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  2. Mohammed Seaid
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Correspondence to Lisha He.

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He, L., Seaid, M. A Runge–Kutta–Chebyshev SPH algorithm for elastodynamics. Acta Mech 227, 1813–1835 (2016). https://doi.org/10.1007/s00707-016-1603-8

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  • DOI: https://doi.org/10.1007/s00707-016-1603-8

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