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• W2104448512 abstract "An efficient, iterative semi-implicit (SI) numerical method for the time integration of stiff wave systems is presented. Physics-based assumptions are used to derive a convergent iterative formulation of the SI scheme which enables the monitoring and control of the error introduced by the SI operator. This iteration essentially turns a semi-implicit method into a fully implicit method. Accuracy, rather than stability, determines the timestep. The scheme is second order accurate and shown to be equivalent to a simple preconditioning method. We show how the diffusion operators can be handled so as to yield the property of robust damping, i.e. dissipating the solution at all values of the parameter DΔt, where D is a diffusion operator and Δt the timestep. The overall scheme remains second order accurate even if the advection and diffusion operators do not commute. In the limit of no physical dissipation, and for a linear test wave problem, the method is shown to be symplectic. The method is tested on the problem of Kinetic Alfvén wave mediated magnetic reconnection. A Fourier (pseudo-spectral) representation is used. A two-field gyrofluid model is used and an efficacious k-space SI operator for this problem is demonstrated. CPU speed-up factors over a CFL-limited explicit algorithm ranging from ∼20 to several hundreds are obtained, while accurately capturing the results of an explicit integration. Possible extension of these results to a real-space (grid) discretization is discussed." @default.
• W2104448512 created "2016-06-24" @default.
• W2104448512 creator A5036333287 @default.
• W2104448512 creator A5044939070 @default.
• W2104448512 date "2008-04-01" @default.
• W2104448512 modified "2023-09-26" @default.
• W2104448512 title "An iterative semi-implicit scheme with robust damping" @default.
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• W2104448512 doi "https://doi.org/10.1016/j.jcp.2008.01.015" @default.
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