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• W2071379419 abstract "We present a systematic approach for calculating higher-order derivatives of smooth functions on a uniform grid using Pad'e approximants. We illustrate our findings by deriving higher-order approximations using traditional second-order finite-differences formulas as our starting point. We employ these schemes to study the stability and dynamical properties of K(2,2) Rosenau-Hyman (RH) compactons including the collision of two compactons and resultant shock formation. Our approach uses a differencing scheme involving only nearest and next-to-nearest neighbors on a uniform spatial grid. The partial differential equation for the compactons involves first, second and third partial derivatives in the spatial coordinate and we concentrate on four different fourth-order methods which differ in the possibility of increasing the degree of accuracy (or not) of one of the spatial derivatives to sixth order. A method designed to reduce roundoff errors was found to be the most accurate approximation in stability studies of single solitary waves, even though all derivates are accurate only to fourth order. Simulating compacton scattering requires the addition of fourth derivatives related to artificial viscosity. For those problems the different choices lead to different amounts of spurious radiation and we compare the virtues of the different choices." @default.
• W2071379419 created "2016-06-24" @default.
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• W2071379419 date "2010-05-28" @default.
• W2071379419 modified "2023-09-27" @default.
• W2071379419 title "Stability and dynamical properties of Rosenau-Hyman compactons using Padé approximants" @default.
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• W2071379419 doi "https://doi.org/10.1103/physreve.81.056708" @default.
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