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On the Choice of Kernel Function in Nonlocal Wave Propagation

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Abstract

It is a challenge to choose the appropriate kernel function in nonlocal problems. We tackle this challenge from the aspect of nonlocal wave propagation and study the dispersion relation at the analytical level. The kernel function enters the formulation as an input. Any effort to narrow down this function family is valuable. Dispersion relations of the nonlocal governing operators are identified. Using a Taylor expansion, a selection criterion is devised to determine the kernel function that provides the best approximation to the classical (linear) dispersion relation. The criterion is based on selecting the smallest coefficient in magnitude of the dominant term in the Taylor expansion after the constant term. The governing operators are constructed using functional calculus, which provides the explicit expression of the eigenvalues of the operators. The ability to express eigenvalues explicitly allows us to obtain dispersion relations at the analytical level, thereby isolating the effect of discretization on the dispersion relation. With the presence of expressions of eigenvalues of the governing operator, the analysis is clear and accessible. The choices made to obtain the best approximation to the classical dispersion relation become completely transparent. We find that the truncated Gaussian family is the most effective compared to power and rational function families.

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Funding

Burak Aksoylu’s research was sponsored by the CCDC Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-16-2-0008. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.

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Authors and Affiliations

  1. CCDC Army Research Laboratory, Attn: FCDD-RLW-MB, Aberdeen Proving Ground, MD, 21005, USA

    Burak Aksoylu & George A. Gazonas

  2. Department of Mathematics, Wayne State University, Detroit, MI, 48202, USA

    Burak Aksoylu

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  1. Burak Aksoylu
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  2. George A. Gazonas
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Correspondence to Burak Aksoylu.

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Aksoylu, B., Gazonas, G.A. On the Choice of Kernel Function in Nonlocal Wave Propagation. J Peridyn Nonlocal Model 2, 379–400 (2020). https://doi.org/10.1007/s42102-020-00034-x

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  • DOI: https://doi.org/10.1007/s42102-020-00034-x

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