کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
517987 867546 2016 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simplex-in-cell technique for collisionless plasma simulations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
پیش نمایش صفحه اول مقاله
Simplex-in-cell technique for collisionless plasma simulations
چکیده انگلیسی

We extend the simplex-in-cell (SIC) technique recently introduced in the context of collisionless dark matter fluids [1] and [2] to the case of collisionless plasmas. The six-dimensional phase space distribution function f(x,v)f(x,v) is represented by an ensemble of three-dimensional manifolds, which we refer to as sheets. The electric potential field is obtained by solving the Poisson equation on a uniform mesh, where the charge density is evaluated by a spatial projection of the phase space sheets. The SIC representation of phase space density facilitates robust, high accuracy numerical evolution of the Vlasov–Poisson system using significantly fewer tracer particles than comparable particle-in-cell (PIC) approaches by reducing the numerical shot-noise associated with the latter. We introduce the SIC formulation and describe its implementation in a new code, which we validate using standard test problems including plasma oscillations, Landau damping, and two stream instabilities in one dimension. Merits of the new scheme are shown to include higher accuracy and faster convergence rates in the number of particles. We finally motivate and outline the efficient application of SIC to higher dimensional problems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational Physics - Volume 304, 1 January 2016, Pages 231–251
نویسندگان
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