Abstract
In this paper, we analyze the explicit Runge-Kutta discontinuous Galerkin (RKDG) methods for the semilinear hyperbolic system of a correlated random walk model describing movement of animals and cells in biology. The RKDG methods use a third order explicit total-variation-diminishing Runge-Kutta (TVDRK3) time discretization and upwinding numerical fluxes. By using the energy method, under a standard Courant-Friedrichs-Lewy (CFL) condition, we obtain L 2 stability for general solutions and a priori error estimates when the solutions are smooth enough. The theoretical results are proved for piecewise polynomials with any degree k ⩾ 1. Finally, since the solutions to this system are non-negative, we discuss a positivity-preserving limiter to preserve positivity without compromising accuracy. Numerical results are provided to demonstrate these RKDG methods.
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Dedicated to Professor Shi Zhong-Ci on the Occasion of his 80th Birthday
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Lu, J., Shu, CW. & Zhang, M. Stability analysis and a priori error estimate of explicit Runge-Kutta discontinuous Galerkin methods for correlated random walk with density-dependent turning rates. Sci. China Math. 56, 2645–2676 (2013). https://doi.org/10.1007/s11425-013-4739-1
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DOI: https://doi.org/10.1007/s11425-013-4739-1
Keywords
- discontinuous Galerkin method
- explicit Runge-Kutta method
- stability
- error estimates
- correlated random walk
- positivity-preserving