کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
502026 863676 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On a semi-implicit scheme for spectral simulations of dispersive magnetohydrodynamics
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
On a semi-implicit scheme for spectral simulations of dispersive magnetohydrodynamics
چکیده انگلیسی

The effectiveness of a semi-implicit (SI) temporal scheme is discussed in the context of the dispersive magnetohydrodynamics where, due to the whistler modes, stability of explicit algorithms requires a time step decreasing quadratically as the resolution is linearly increased. After analyzing the effects of this scheme on the Alfvén-wave dispersion relation, spectral simulations of nonlinear initial value problems where small-scale dispersion has a main effect on the global dynamics are presented. Permitting a moderate, albeit significant, increase of the time step for a minor additional cost relatively to explicit schemes, the SI algorithm provides an efficient tool in situations, such as turbulent regimes, where the time steps making fully implicit schemes efficient are too large to ensure a satisfactory accuracy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computer Physics Communications - Volume 180, Issue 10, October 2009, Pages 1860–1869
نویسندگان
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